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Strong metal support interaction in Ru/La2O3 catalyst for plasma enhanced ammonia decomposition to produce hydrogen 认领 引用
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作者 Zhijun Wang Huilin He +11 位作者 Jiyou Deng Yi Duan Ke Zhang Xiayu Qiu Guangjiu Lei Shaofei Geng Guoyao Zheng Qi Sun Lei Zhang Xin Tu Kun Zhang Bin Zhao 《Journal of Rare Earths》 SCIE EI CAS CSCD 2026年第5期1477-1489,共13页
Ammonia is a promising carbon-free hydrogen carrier owing to its high volumetric H2 density.To facilitate practical applications,developing efficient catalysts and facile reaction methodologies is highly demanded f... Ammonia is a promising carbon-free hydrogen carrier owing to its high volumetric H2 density.To facilitate practical applications,developing efficient catalysts and facile reaction methodologies is highly demanded for the production of high-purity H2 with minimum energy consumption.In this study,plasma-catalytic ammonia decomposition was investigated using Ru/La2O3 catalysts synthesized via a straightforward wet impregnation method.The metal-support interaction(MSI)between Ru and La2O3 was modulated by varying the calcination temperature.Surface reaction behavior analysis of the ammonia decomposition catalysts reveals that the strong MSI provided by the Ru/La2O3 catalyst calcined at 850℃ significantly enhances the desorption of N and H atoms from the catalyst surface.When combined with dielectric barrier discharge(DBD)plasma,the dissociation of the N-H bond is markedly promoted,leading to a substantial increase in ammonia decomposition reactivity.The Ru/La2O3-850 catalyst achieves an impressive energy efficiency of 20.7 mol/(gcat.kWh)at 99%NH3 conversion,and stable performance for plasma-catalyzed ammonia decomposition.This study presents a synergistic strategy to enhance the rate-determining steps of ammonia decomposition through the integration of plasma and catalyst. 展开更多
关键词 Ammonia decomposition Ru/La2O3catalyst Strong metal support interaction Plasma catalysis Hydrogen production Rare earths
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Highly selective catalytic hydrogenation conversion of CO2to CO over lanthanum-doped supported ruthenium catalysts 认领 引用
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作者 Lanqing Yang Xinyi Xie +3 位作者 Shidong Bao Xiaolei Qu Shourong Zheng Heyun Fu 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第5期136-144,共9页
The selective catalytic hydrogenation of CO2to CO via the RWGS reaction is an effective avenue for resource utilization of CO2.In this study,we prepared serial La2O3-doped Ru catalysts(i.e.,RuLa/SBA-15)usi... The selective catalytic hydrogenation of CO2to CO via the RWGS reaction is an effective avenue for resource utilization of CO2.In this study,we prepared serial La2O3-doped Ru catalysts(i.e.,RuLa/SBA-15)using a facile sequential impregnation method,and applied it for the selective hydrogenation conversion of CO2into CO.The La2O3doping remarkably promotes the dispersion of Ru nanoparticles and induces the formation of electron-deficient Ru species(Run+).In-situ DRIFTS study reveals that the hydrogenation of CO2over Ru catalysts with and without La2O3doping proceeds through different pathways.Both CO and CH4are formed on non-doped Ru/SBA-15 with formate as the key intermediate,but only CO is generated on RuLa/SBA-15 via carbonate as the intermediate because of the weakened CO adsorption on Run+.Thus,RuLa/SBA-15 exhibits outstanding CO selectivity for the hydrogenation of CO2without significant decline of activity.It achieves a CO2conversion of 51%at 600℃and nearly 100%of CO selectivity across the examined reaction temperature of 300-600℃,surpassing the performances of the non-doped counterpart(CO2conversion of 58%at 600℃and CO selectivity ranging from 2%-63%).This study provides a facile and cost-effective strategy to tune the structure of Ru catalysts for the hydrogenation conversion of CO2to obtain value-added products. 展开更多
关键词 Catalytic hydrogenation of CO2 Ru catalysts Element doping CO selectivity Carbon capture and utilization
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Electronic interactions and hydrogen migration over C60-modified Ru catalyst enhance ammonia synthesis 认领 引用
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作者 Xuanbei Peng Xiaohu Hu +10 位作者 Ruishao Mao Mengqi An Jiaxin Li Yangyu Zhang Tianhua Zhang Ming Chen Yanliang Zhou Jun Ni Lirong Zheng Xiuyun Wang Lilong Jiang 《Chinese Chemical Letters》 SCIE CAS CSCD 2026年第7期412-417,共6页
The potential use of ammonia(NH3)as a hydrogen energy carrier has generated significant interest in developing efficient catalysts for producing NH3 under mild conditions.The main obstacles for NH3 synthesis ... The potential use of ammonia(NH3)as a hydrogen energy carrier has generated significant interest in developing efficient catalysts for producing NH3 under mild conditions.The main obstacles for NH3 synthesis are the activation of the N≡N bond and the desorption of NH3 from the catalyst surface.Here,we report the use of C60 to overcome these challenges.Through electron transfer,migration,and feedback between C60 and Ru,there is a balance of electronic density at the Ru active sites and a shift in the d-band center.This simultaneously satisfies the electronic requirements for enhancing N2 activation while weakening NH3 adsorption,thereby circumventing the bottlenecks in NH3 synthesis under mild conditions.Meanwhile,anchoring of C60 accelerates hydrogen spillover and enhances the exchangeability of hydrogen species in the Zr H2 support,as well as expose a greater number of B5 sites of Ru entities,resulting in the co-optimization of hydrogen migration and nitrogen activation.As a consequence,the NH3 synthesis rate of the C60-Ru/ZrH2 catalyst is approximately twice that of the Ru/ZrH2 catalyst at 400℃ and 1 MPa.This study shows that doping C60 represents a fundamentally different approach compared to traditional promoters for catalytic NH3 synthesis.We anticipate that this strategy may be generalized to generate widespread interest in the catalysis of NH3 synthesis. 展开更多
关键词 N2activation Carbon clusters Ru catalysts Hydrogen spillover NH3desorption
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Enhanced activity of CO oxidation at room temperature by tuning the metal-support interaction of Ru/CeO2catalyst 认领 引用
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作者 Xiaoxin Wang Min Chen +5 位作者 Xiaoxiao Qin Bolang Li Xueyan Chen Jianghao Zhang Kunlin Li Changbin Zhang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2025年第8期436-443,共8页
To develop efficient catalysts for ambient carbon monoxide(CO)oxidation is significant for indoor air purification and also for many industrial applications.In this work,the catalytic activity for CO oxidation were en... To develop efficient catalysts for ambient carbon monoxide(CO)oxidation is significant for indoor air purification and also for many industrial applications.In this work,the catalytic activity for CO oxidation were enhanced by tuning the metal-support interaction of Ru/CeO2catalysts.A series of Ru/CeO2catalysts were synthesized by an impregnation method with calcination at 100,200,400 and 600℃,respectively,to regulate the Ru-CeO2interaction.We discovered that low temperature calcination(100℃)induced more Ru-O-Ce bonds and stronger Ru-CeO2interaction,while high temperature calcination(≥400℃)caused the agglomeration of Ru species with more Ru-O-Ru bonds and weaker Ru-CeO2interaction,resulting in the lower redox capacity of these catalysts,as well as lower catalytic activity for CO oxidation.Only calcination at moderate 200℃ can induce the moderate interaction between Ru species and CeO2support,which can keep the high dispersion of RuOxspecies with the high redox capacity,thus leading to complete elimination of 500 ppm CO at room temperature on Ru/Ce-200 catalyst. 展开更多
关键词 Carbon monoxide oxidation Ru/CeO2catalysts metal-support interaction Surface oxygen species Redox capacity
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The Effect of Titania Structure on Ni/TiO_2 Catalysts for p-Nitrophenol Hydrogenation 认领 引用 被引量：12
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作者 陈日志 杜艳 +1 位作者 邢卫红 徐南平 《Chinese Journal of Chemical Engineering》 SCIE EI CAS 2006年第5期665-669,共5页
The catalytic hydrogenation of p-nitrophenol to p-aminophenol was investigated over Ni/TiO2 catalysts prepared by a liquid-phase chemical reduction method. The catalysts were characterized by inductively coupled plasm... The catalytic hydrogenation of p-nitrophenol to p-aminophenol was investigated over Ni/TiO2 catalysts prepared by a liquid-phase chemical reduction method. The catalysts were characterized by inductively coupled plasma (ICP), X-ray powder diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectra (XPS) and temperature-programmed reduction (TPR). Results show that the titania structure has favorable influence on physio-chemical and catalytic properties of Ni/TiO2 catalysts. Compared to commercial Raney nickel, the catalytic activity of Ni/TiO2 catalyst is much superior, irrespective of the titania structure. The catalytic activity of anatase titania supported nickel catalyst Ni/TiO2(A) is higher than that of rutile titania supported nickel catalyst Ni/TiO2(R), possibly because the reduction of nickel oxide to metallic nickel for Ni/TiO2(A) is easier than that for Ni/TiO2(R) at similar reaction conditions. 展开更多
关键词 p-nitrophenol catalytic hydrogenation p-aminophenol Ni/TiO2 catalyst
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Supporting IrO2 and IrRuOx nanoparticles on TiO2 and Nb-doped TiO2 nanotubes as electrocatalysts for the oxygen evolution reaction 认领 引用 被引量：3
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作者 Radostina V.Genova-Koleva Francisco Alcaide +4 位作者 Garbine Alvarez Pere L.Cabot Hans-Jürgen Grande María V.Martínez-Huerta Oscar Miguel 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2019年第7期227-239,共13页
IrO2 and IrRuOx(Ir:Ru 60:40 at%),supported by 50 wt%onto titania nanotubes(TNTs)and(3 at%Nb)Nb-doped titania nanotubes(Nb-TNTs),as electrocatalysts for the oxygen evolution reaction(OER),were synthesized and character... IrO2 and IrRuOx(Ir:Ru 60:40 at%),supported by 50 wt%onto titania nanotubes(TNTs)and(3 at%Nb)Nb-doped titania nanotubes(Nb-TNTs),as electrocatalysts for the oxygen evolution reaction(OER),were synthesized and characterized by means of structural,surface analytical and electrochemical techniques.Nb doping of titania significantly increased the surface area of the support from 145(TNTs)to 260 m2g-1(Nb-TNTs),which was significantly higher than those of the Nb-doped titania supports previously reported in the literature.The surface analytical techniques showed good dispersion of the catalysts onto the supports.The X-ray photoelectron spectroscopy analyses showed that Nb was mainly in the form of Nb(IV)species,the suitable form to behave as a donor introducing free electrons to the conduction band of titania.The redox transitions of the cyclic voltammograms,in agreement with the XPS results,were found to be reversible.Despite the supported materials presented bigger crystallite sizes than the unsupported ones,the total number of active sites of the former was also higher due to their better catalyst dispersion.Considering the outer and the total charges of the cyclic voltammograms in the range 0.1–1.4 V,stability and electrode potentials at given current densities,the preferred catalyst was Ir O2 supported on the Nb-TNTs.The electrode potentials corresponding to given current densities were between the smallest ones given in the literature despite the small oxide loading used in this work and its Nb doping,thus making the Nb-TNTs-supported IrO2 catalyst a promising candidate for the OER.The good dispersion of IrO2,high specific surface area of the Nb-doped supports,accessibility of the electroactive centers,increased stability due to Nb doping and electron donor properties of the Nb(IV)oxide species were considered the main reasons for its good performance. 展开更多
关键词 Nb-doped TiO2 nanotubes IrO2 catalyst IrRuOx catalyst Oxygen evolution reaction PEMWE
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Tuned selectivity and enhanced activity of CO2 methanation over Ru catalysts by modified metal-carbonate interfaces 认领 引用 被引量：2
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作者 Qiaojuan Wang Yating Gao +4 位作者 Chantsalmaa Tumurbaatar Tungalagtamir Bold Fei Wei Yihu Dai Yanhui Yang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2022年第1期38-46,I0002,共9页
Carbonate-modified metal-support interfaces allow Ru/MnCO3 catalyst to exhibit over 99% selectivity,great specific activity and long-term anti-CO poisoning stability in atmospheric CO2 methanation.As a contrast,... Carbonate-modified metal-support interfaces allow Ru/MnCO3 catalyst to exhibit over 99% selectivity,great specific activity and long-term anti-CO poisoning stability in atmospheric CO2 methanation.As a contrast,Ru/MnO catalyst with metal-oxide interfaces prefers reverse water-gas shift rather than methanation route,along with a remarkably lower activity and a less than 15% CH4 selectivity.The carbonatemodified interfaces are found to stabilize the Ru species and activate CO2 and H2 molecules.Ru-CO4 species are identified as the reaction intermediates steadily formed from CO2 dissociation,which show moderate adsorption strength and high reactivity in further hydrogenation to CH4,Furthermore,carbonates of Ru/MnCO3 are found to be consumed by hydrogenation to form CH4 and replenished by exchange with CO2,which are in a dynamic equilibrium during the reaction.Modification with surface carbonates is proved as an efficient strategy to endow metal-support interfaces of Ru-based catalysts with unique catalytic functions for selective CO2 hydrogenation. 展开更多
关键词 C02methanation Ru catalyst MnO Carbonate Metal-support interface
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Fabrication of C@MoxTi1-xO2-δ nanocrystalline with functionalized interface as efficient and robust PtRu catalyst support for methanol electrooxidation 认领 引用 被引量：2
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作者 Jialong Li Lei Zhao +2 位作者 Xifei Li Sue Hao Zhenbo Wang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2020年第1期7-14,I0001,共8页
A core shell structured C@MoxTi1-xO2-δnanocrystal with a functionalized interface(C@MTNC-FI)was fabricated via the hydrothermal method with subsequent annealing derived from tetrabutyl orthotitanate.The formation of ... A core shell structured C@MoxTi1-xO2-δnanocrystal with a functionalized interface(C@MTNC-FI)was fabricated via the hydrothermal method with subsequent annealing derived from tetrabutyl orthotitanate.The formation of anatase TiO2 was inhibited by the simultaneous presence of the hydrothermal etchingegrowth process,infiltration of Mo dopants and carbon coating,which endows the C@MTNC-FI with an ultrafine crystalline architecture that has a Mo-functionalized interface and carbon-coated shell.Pt Ru nanoparticles(NPs)were supported on C@MTNC-FI by employing a microwave-assisted polyol process(MAPP).The obtained Pt Ru/C@MTNC-FI catalyst has 2.68 times higher mass activity towards methanol electrooxidation than that of the un-functionalized catalyst(Pt Ru/C@TNC)and 1.65 times higher mass activity than that of Pt Ru/C catalyst with over 25%increase in durability.The improved catalytic performance is due to several aspects including ultrafine crystals of TiO2 with abundant grain boundaries,Mofunctionalized interface with enhanced electron interactions,and core shell architecture with excellent electrical transport properties.This work suggests the potential application of an interface-functionalized crystalline material as a sustainable and clean energy solution. 展开更多
关键词 Interface functionalization TiO2 Nanocrystalline Mo doping Core–shell PtRu catalyst Methanol electrooxidation
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Effect of calcination temperature on structure and performance of Ni/TiO_2-SiO_2 catalyst for CO_2 reforming of methane 认领 引用 被引量：6
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作者 Sanbing Zhang Jiankang Wang Xiaolai Wang 《Journal of Natural Gas Chemistry》 2008年第2期179-183,共5页
The influence of calcination temperature on the structure and catalytic behavior of Ni/TiO2-SiO2 catalyst, for CO2 reforming of methane to synthesis gas under atmospheric pressure, was investigated. The results showed... The influence of calcination temperature on the structure and catalytic behavior of Ni/TiO2-SiO2 catalyst, for CO2 reforming of methane to synthesis gas under atmospheric pressure, was investigated. The results showed that the Ni/TiO2-SiO2 catalyst calcined at 700 ℃ had high and stable activity while the catalysts calcined at 550 and 850 ℃ had low and unstable activity. Depending on the calcination temperature, one, two, or three of the following Ni-containing species, NiO, Ni2.44Ti0.72Si0.07O4, and NiTiO3 were identified by combining the temperature programmed reduction （TPR） and X-ray diffraction （XRD） results. Their reducibility decreased in the sequence： NiO〉Ni2.44Ti0.72Si0.07O4〉NiTiO3. It suggests that high and stable activities observed over the Ni/TiO2-SiO2 catalyst calcined at 700 ~C were induced by the formation of Ni2.44Ti0.72Si0.07O4 and smaller NiO species crystallite size. 展开更多
关键词 Ni/TiO2-SiO2 catalyst sol-gel CO2 reforming methane
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CO_2 methanation over TiO_2–Al_2O_3 binary oxides supported Ru catalysts 认领 引用 被引量：3
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作者 Jinghua Xu Qingquan Lin +3 位作者 Xiong Su Hongmin Duan Haoran Geng Yanqiang Huang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2016年第1期140-145,共6页
TiO_2 modified Al_2O_3 binary oxide was prepared by a wet-impregnation method and used as the support for ruthenium catalyst. The catalytic performance of Ru/TiO_2–Al_2O_3catalyst in CO_2 methanation reaction was inv... TiO_2 modified Al_2O_3 binary oxide was prepared by a wet-impregnation method and used as the support for ruthenium catalyst. The catalytic performance of Ru/TiO_2–Al_2O_3catalyst in CO_2 methanation reaction was investigated. Compared with Ru/Al_2O_3 catalyst, the Ru/TiO_2–Al_2O_3catalytic system exhibited a much higher activity in CO_2 methanation reaction. The reaction rate over Ru/TiO_2–Al_2O_3 was 0.59 mol CO_2·(g Ru)1·h-1, 3.1 times higher than that on Ru/Al_2O_3[0.19 mol CO_2·(gRu)-1·h-1]. The effect of TiO_2 content and TiO_2–Al_2O_3calcination temperature on catalytic performance was addressed. The corresponding structures of each catalyst were characterized by means of H_2-TPR, XRD, and TEM. Results indicated that the averaged particle size of the Ru on TiO_2–Al_2O_3support is 2.8 nm, smaller than that on Al_2O_3 support of 4.3 nm. Therefore, we conclude that the improved activity over Ru/TiO_2–Al_2O_3catalyst is originated from the smaller particle size of ruthenium resulting from a strong interaction between Ru and the rutile-TiO_2 support, which hindered the aggregation of Ru nanoparticles. 展开更多
关键词 CO2 methanation Supported Ru catalyst TiO2–Al2O3 binary oxide
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Advanced heterolytic H2 adsorption of K-added Ru/MgO catalysts for accelerating hydrogen storage into aromatic benzyltoluenes 认领 引用 被引量：1
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作者 Tae Wan Kim Hwiram Jeong +4 位作者 Yeongin Jo Dongun Kim Ji Hoon Park Seok Ki Kim Young-Woong Suh 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2022年第8期333-343,I0009,共11页
Herein,we report a highly active K-added Ru/MgO catalyst for hydrogen storage into aromatic benzyltoluenes at low temperatures to advance liquid organic hydrogen carrier technology.The hydrogenation activity of Ru/K/M... Herein,we report a highly active K-added Ru/MgO catalyst for hydrogen storage into aromatic benzyltoluenes at low temperatures to advance liquid organic hydrogen carrier technology.The hydrogenation activity of Ru/K/MgO catalysts exhibits a volcano-shaped dependence on the K content at the maximum with 0.02 wt%.This is in good agreement with the strength and capacity of H2 adsorption derived from basicity,despite a gradual decrease in the textural property and the corresponding increase in the Ru particle size with increasing the K content.Density functional theory calculations show that heterolytic hydrogen adsorption properties(strength and polarization)are facilitated up to a specific density of K on the Ru–MgO interface and excessive K suppresses heterolytic H2 adsorption by direct interaction between K and hydrogen,assuring the hydrogenation activity and H2 adsorption capability of Ru/K/MgO catalysts.Hence,the Ru/K/MgO catalyst,when K is added in an optimal amount,is highly effective to accelerate hydrogen storage kinetics at low temperatures owing to the enhanced heterolytic H2 adsorption. 展开更多
关键词 Chemical hydrogen storage Supported Ru catalysts Ru–MgO interface Heterolytic H2adsorption Charge transfer Potassium promotion
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Defective Ru1@Mo2COxsingle-atom catalyst for efficient thermal catalysis for ammonia synthesis 认领 引用
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作者 Ya Ren Cong Zhang +4 位作者 Haiyan Wang Jin-Xia Liang Chun Zhu Han-Shi Hu Jun Li 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2025年第8期81-87,共7页
The reduction of N2 to NH3 is an important reaction for the industrial production of ammonia gas.Here,we theoretically study the thermal synthesis of ammonia catalyzed by Ru1@Mo2COxsingle-atom catalyst(SAC),w... The reduction of N2 to NH3 is an important reaction for the industrial production of ammonia gas.Here,we theoretically study the thermal synthesis of ammonia catalyzed by Ru1@Mo2COxsingle-atom catalyst(SAC),where Ru atoms are anchored on the oxygen vacancy of the defective Mo2COx.The results show that Ru1@Mo2COxexhibits excellent stability,and can effectively adsorb and activate N2,owing to up to0.87|e|charge transfer from it to N2.The optimal pathway of N2-to-NH3 conversion is association pathway I,of which the rate-determining step is*NH2→*NH3 with the barrier energy of 1.26 eV.Especially,the Mo2COxcenter functions as an electron reservoir,donating electrons to the NxHy species,while the Ru single atom serves as a charge transfer pathway,thereby enhancing the reaction activity.This finding provides a theoretical foundation for the rational design of MXene-based SACs for thermal catalytic NH3 synthesis. 展开更多
关键词 N2-to-NH3conversion Single-atom catalyst DFT MXene Ru1@Mo2COx
Photo-depositing Ru and RuO2on Anatase TiO2Nanosheets as Co-catalysts for Photocatalytic O2 Evolution from Water Oxidation 认领 引用 被引量：1
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作者 Shi-yang Mi Yuan-xu Liu Wen-dong Wang 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2016年第5期585-590,I0002,共6页
TiO2 nanosheets mainly exposed (001) facet were prepared through a hydrothermal process with HF as the morphology-directing agent. Ru and RuO2 species were loaded by photo-deposition methods to prepare the photocataly... TiO2 nanosheets mainly exposed (001) facet were prepared through a hydrothermal process with HF as the morphology-directing agent. Ru and RuO2 species were loaded by photo-deposition methods to prepare the photocatalysts. The structural features of the catalysts were characterized by X-ray di raction, transmission electron microscopy, inductively cou-pled plasma atomic emission spectrum, and H2 Temperature-programmed reduction. The photocatalytic property was studied by the O2 evolution from water oxidation, which was examined with respect to the in uences of Ru contents as well as the oxidation and reduction treatments, suggesting the charge separation effect of the Ru species co-catalysts on di erent facets of TiO2 nanosheets. In contrast to Ru/TiO2 and RuO2/TiO2 with the single deposited co-catalyst, the optimized catalyst 0.5%Ru-1.0%RuO2/TiO2 with dual co-catalysts achieved a much improved catalytic performance, in terms of the synergetic effect of dual co-catalysts and the enhanced charge separation effect. 展开更多
关键词 Anatase TiO2 nanosheets Photocatalytic O2 evolution Crystal facet Ru co-catalyst Charge separation
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CHARACTERIZATION OF COBALT SITES IN REDUCED Co-Mo/Al_2O_3 AND Ru-Co-Mo/Al_2O_3 CATALYSTS 认领 引用
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作者 Fend Shou XIAO Qin XIN Xie Xian GUO 《Chinese Chemical Letters》 SCIE CAS 1991年第7期581-582,共2页
The two Co sites are well characterized in reduced Co-Mo/Al_2O_3 and Ru-Co- Mo/Al_2O_3 by new bands at 1895 and 1880 cm-1in the IR spectra due to NO adsorption.
关键词 Mo Co CO CHARACTERIZATION OF COBALT SITES IN REDUCED Co-Mo/Al2O3 AND Ru-Co-Mo/Al2O3 CATALYSTS Al Ru
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载体形貌对于Ru/CeO2催化剂合成氨性能影响的研究 认领 引用 被引量：1
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作者 王鹏 张江涛 +2 位作者 徐永平 李淑英 王爽 《太原理工大学学报》 CAS 北大核心 2025年第4期621-630,共10页
【目的】钌纳米粒子(Ru nanoparticles,Ru NPs)在反应过程中易团聚,导致其在合成氨中的催化性能显著降低,选取合适的载体分散Ru NPs是一种行之有效的解决策略。【方法】采用OH-调控策略,通过改变OH-的浓度合成了三种不同形貌的CeO2(... 【目的】钌纳米粒子(Ru nanoparticles,Ru NPs)在反应过程中易团聚,导致其在合成氨中的催化性能显著降低,选取合适的载体分散Ru NPs是一种行之有效的解决策略。【方法】采用OH-调控策略,通过改变OH-的浓度合成了三种不同形貌的CeO2(纳米颗粒(CeO2-NP)、纳米棒(CeO2-NR)和纳米立方体(CeO2-NC)),随后利用浸渍还原法在CeO2上负载Ru NPs,获得了Ru/CeO2催化剂,借助于XRD、XPS、SEM、TEM、H2-TPR等仪器对催化剂物化性质进行了详细表征,并在温和条件下考察了三种催化剂的氨合成活性。【结果】结果显示,当Ru NPs的负载量为2.5%时,得到的2.5%Ru/CeO2-NR催化剂具有适宜尺寸的Ru NPs、更多的氧空位、Ru—O—Ce键和Run+物种,在1 MPa、450℃的条件下,表现出高的氨合成速率。另外,2.5%Ru/CeO2-NR没有发生氢中毒,并能维持120 h的热稳定性,显示了潜在的实际应用前景。 展开更多
关键词 OH-调控策略 不同形貌的二氧化铈 钌纳米粒子 负载型催化剂 合成氨
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Novel promoting effects of cerium on the activities of NO_x reduction by NH_3 over TiO_2-SiO_2-WO_3 monolith catalysts 认领 引用 被引量：15
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作者 房志涛 林涛 +3 位作者 徐海迪 吴干学 孙萌萌 陈耀强 《Journal of Rare Earths》 SCIE EI CAS CSCD 2014年第10期952-959,共8页
A series of catalysts were prepared by doping different loadings of CeO2 over TiO2-SiO2-WO3 and used for the selective catalytic reduction of NOx by NH3. The experimental results showed that the selective catalytic re... A series of catalysts were prepared by doping different loadings of CeO2 over TiO2-SiO2-WO3 and used for the selective catalytic reduction of NOx by NH3. The experimental results showed that the selective catalytic reduction（SCR） performance and SO2-resistant ability of TiO2-SiO2-WO3 were greatly enhanced by the introduction of cerium. The catalyst containing 10% CeO2 showed the highest NO conversion in a wide temperature range and good N2 selectivity with broad operation temperature window at the gas hourly space velocity（GHSV） of 30000 h–1, which was a very promising catalyst for NOx abatement from diesel engine exhaust. The catalysts were characterized by X-ray diffraction（XRD）, scanning electron microscopy with energy dispersive X-ray spectroscopy（SEM-EDS）, N2 adsorption-desorption（BET） and X-ray photoelectron spectroscopy（XPS）. The characterization results showed that the bigger pore radius, higher surface atomic concentration and dispersion of Ce and the abundant adsorbed oxygen on the surface of catalyst contributed to the best NH3-SCR performance of CeO2/TiO2-SiO2-WO3 catalyst containing 10% CeO2. 展开更多
关键词 NH3-SCR NO cerium CeO2/TiO2-SiO2-WO3 monolith catalyst rare earths
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Effects of Atmospheres and Precursors on MnO_x/TiO_2 Catalysts for NH_3-SCR at Low Temperature 认领 引用 被引量：17
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作者 方德 HE Feng +2 位作者 谢峻林 FU Zhengbing CHEN Junfu 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2013年第5期888-892,共5页
The effects of atmospheres and precursors on MnOx/TiO2 catalysts were studied, which were prepared by the impregnation method and tested for their NOx conversion activity in ammonia selective catalytic reduction （NH3... The effects of atmospheres and precursors on MnOx/TiO2 catalysts were studied, which were prepared by the impregnation method and tested for their NOx conversion activity in ammonia selective catalytic reduction （NH3-SCR） reactions. Results showed that the manganese carbonate （MC） precursor caused mainly Mn2O3, while the manganese nitrate （MN） precursor resulted primarily in MnO2 and the manganese sulfate （MS） precursor was unchanged. The manganese acetate （MA） precursor leaded obtaining a mixture of Mn2O3 and Mn304. NOn conversion decreased in the following order： MA/TiO2 〉 MC/TiO2 〉 MN/TiO2 〉 MS/TiO2 〉 P25, with a calcination temperature of 773 K in air. Catalysts that were prepared by MA and calcined in oxygen performed strong interaction between Ti and Mn, while MnTiO3 was observed. Compared to the catalysts calcined in nitrogen, those calcined in oxygen had larger diameter and smaller surface area and pore. Catalysts that were prepared by MA and calcined in nitrogen tended to gain higher denitration rates than those in air, since they could be prepared with significant specific surface areas. NO., conversion decreased with calcination atmospheres： Nitrogen〉 Air〉 Oxygen. Meanwhile, amorphous Mn2O3 turned into crystalline Mn2O3, when the temperatures increased from 673 to 873 K. 展开更多
关键词 MnOx/TiO2 catalyst precursor atmosphere NH3-SCR
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Promoting effect and mechanism of neodymium on low-temperature selective catalytic reduction with NH3 over Mn/TiO2 catalysts 认领 引用 被引量：8
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作者 Peng Wu Yaping Zhang +3 位作者 Ke Zhuang Kai Shen Sheng Wang Tianjiao Huang 《Journal of Rare Earths》 SCIE EI CAS CSCD 2020年第11期1215-1223,I0003,共9页
Series of Mn/TiO2 catalysts modified with various contents of Nd for low-temperature SCR were synthesized.It can be found that the appropriate amount of Nd can markedly reduce the take-off temperature of Mn/TiO2 catal... Series of Mn/TiO2 catalysts modified with various contents of Nd for low-temperature SCR were synthesized.It can be found that the appropriate amount of Nd can markedly reduce the take-off temperature of Mn/TiO2 catalyst to 80℃and NOx conversion is stabilized over 90%in the wide temperature range of 100-2600 C.0.1 Nd-Mn/Ti shows higher N2 selectivity and better SO2 resistance than Mn/Ti catalyst.The results reveal that Nd-doped Mn/TiO2 catalyst exhibits larger BET surface area and better dispersion of active component Mn2O3.XPS results indicate that the optimal 0.1 Nd-Mn/Ti sample possesses higher concentration of Mn4+and larger amount of adsorbed oxygen at the surface compared with the unmodified counterpart.In situ DRIFTS show that the surface acidity is evidently increased after adding Nd,especially,the Lewis acid sites,and the intermediate(-NH2)is more stable.The reaction mechanism over Mn/Ti and 0.1 Nd-Mn/Ti catalysts obey the Eley-Rideal(E-R)mechanisms under low temperature reaction conditions.H2-TPR results show that Nd-Mn/TiO2 catalyst exhibits better lowtemperature redox properties. 展开更多
关键词 Nd modification Mn/TiO2 catalyst Low-temperature Selective catalyst reduction Mechanism Rare earths
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Selective catalytic oxidation of NO with O_2 over Ce-doped MnO_x/TiO_2 catalysts 认领 引用 被引量：29
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作者 Xiaohai Li Shule Zhang +2 位作者 Yong Jia Xiaoxiao Liu Qin Zhong 《Journal of Natural Gas Chemistry》 CSCD 2012年第1期17-24,共8页
A series of Ce-doped MnOx/TiO2 catalysts were prepared by impregnation method and used for catalytic oxidation of NO in the presence of excess O2. The sample with the Ce doping concentration of Ce/Mn=l/3 and calcined ... A series of Ce-doped MnOx/TiO2 catalysts were prepared by impregnation method and used for catalytic oxidation of NO in the presence of excess O2. The sample with the Ce doping concentration of Ce/Mn=l/3 and calcined at 300 ℃ shows a superior activity for NO oxidation to NO2. On Ce（1）Mn（3）Ti catalyst, 58% NO conversion was obtained at 200 ℃ and 85% NO conversion at 250 ℃ with a GHSV of 41000 h-1, which was much higher than that over MnOx/TiO2 catalyst （48% at 250 ℃）. Characterization results implied that the higher activity of Ce（1）Mn（3）Ti could be attributed to the enrichment of well-dispersed MnO2 on the surface and the abundance of Mn3＋ and Zi3＋ species. The addition of Ce into MnO2/TiO2 could improve oxygen storage capacity and facilitate oxygen mobility of the catalyst as shown by PL and ESR, so that its activity for NO oxidation could be enhanced. The effect of H2O and SO2 on the catalyst activity was also investigated. 展开更多
关键词 selective catalytic oxidation （SCO） of NO MnOx/TiO2 catalysts Ce-doped catalysts
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Improving the denitration performance and K-poisoning resistance of the V_2O_5-WO_3/TiO_2 catalyst by Ce4+ and Zr4+ co-doping 认领 引用 被引量：22
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作者 Jun Cao Xiaojiang Yao +4 位作者 Fumo Yang Li Chen Min Fu Changjin Tang Lin Dong 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2019年第1期95-104,共10页
A series of V2O5‐WO3/TiO2‐ZrO2,V2O5‐WO3/TiO2‐CeO2,and V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalysts were synthesized to improve the selective catalytic reduction(SCR)performance and the K‐poisoning resistance of a V2O5‐W... A series of V2O5‐WO3/TiO2‐ZrO2,V2O5‐WO3/TiO2‐CeO2,and V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalysts were synthesized to improve the selective catalytic reduction(SCR)performance and the K‐poisoning resistance of a V2O5‐WO3/TiO2 catalyst.The physicochemical properties were investigated by using XRD,BET,NH3‐TPD,H2‐TPR,and XPS,and the catalytic performance and K‐poisoning resistance were evaluated via a NH3‐SCR model reaction.Ce^4+and Zr^4+co‐doping were found to enhance the conversion of NOx,and exhibit the best K‐poisoning resistance owing to the largest BET‐specific surface area,pore volume,and total acid site concentration,as well as the minimal effects on the surface acidity and redox ability from K poisoning.The V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalyst also presents outstanding H2O+SO2 tolerance.Finally,the in situ DRIFTS reveals that the NH3‐SCR reaction over the V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalyst follows an L‐H mechanism,and that K poisoning does not change the reaction mechanism. 展开更多
关键词 V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalyst Co‐doping K‐poisoning NH3‐SCR Reaction mechanism
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