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Metal-free C(CN)3cooperated with Co–Ti dual sites in bimetallic CoTi-MOF as a tandem photocatalyst for highly efficient C2H4production 认领 引用
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作者 Lijun Xiong Dandan Zhu +4 位作者 Chenglong Qiu Weihong Zeng Mingshi Xu Shanshan Wang Yong Yang 《Green Energy & Environment》 SCIE EI CAS CSCD 2026年第4期1135-1145,共11页
The photocatalytic reduction of carbon dioxide(CO2)into high-value C2+hydrocarbons represents a sustainable pathway to alleviate energy shortages and reduce atmospheric CO2levels.In this study,a unique tandem... The photocatalytic reduction of carbon dioxide(CO2)into high-value C2+hydrocarbons represents a sustainable pathway to alleviate energy shortages and reduce atmospheric CO2levels.In this study,a unique tandem photocatalyst(CoTi-CN)is constructed by integrating bimetallic CoTi-MOF with metal-free half-metallic C(CN)3.This composite demonstrates markedly enhanced activity and selectivity in the photocatalytic CO2reduction to ethylene(C2H4),achieving a C2H4selectivity of 36.8%and a generation yield of 31.3μmol g-1over 5 h.Density functional theory(DFT)calculations combined with in situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS)analysis reveal that C(CN)3acts as an efficient CO2to CO converter,while CoTi-MOF favors the adsorption and C-C coupling of*CO intermediates.The spatially decoupled CO generation and C-C coupling processes lead to optimized intermediate coverage and reduced energy barriers,resulting in superior selectivity toward multi-carbon products.This work opens new horizons for the design of tandem photocatalysts that combine half-metallic catalysts with bimetallic MOFs,achieving a significant enhancement in the activity and selectivity of photocatalytic C2H4production. 展开更多
关键词 Tandem catalyst Bimetallic CoTi-MOF Half-metallic C(CN)3 Photocatalytic CO2reduCtion C-C coupling
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Highly efficientcleavage of C—O bonds in diphenyl ether over Ni-S2O82-/ZrO2 solid super acid catalysts 认领 引用
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作者 Xiaoyan Zhao Xin Hu +5 位作者 Chuang Zhang Wei Jiang Jingpei Cao Zuxing Huan Yue Wang Changrui Tan 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2025年第10期34-44,共11页
Catalytic aryl ether C—O bonds hydrogenolysis was an important route to convert lignite into high valueadded chemicals.Solid super acid 10%Ni-S2O82-=ZrO2 catalysts were successfully synthesized and evalua... Catalytic aryl ether C—O bonds hydrogenolysis was an important route to convert lignite into high valueadded chemicals.Solid super acid 10%Ni-S2O82-=ZrO2 catalysts were successfully synthesized and evaluated their performance in catalytic hydrolysis of lignite derivatives.The excellent performance of 10%Ni-S2O82-=ZrO2 stems from the synergistic interaction between metallic and acidic sites.Specifically,the acidic sites generated by S2O82- facilitate the adsorption of O atoms in the substrate,whereas the metal sites optimize the process of hydrogen adsorption and activation and promote the generation of hydrogen radicals,which further enhances the ability to break C—O bonds.Thus,10%Ni-S2O82-=ZrO2 exhibits more significantcatalytic activity compared to 10%Ni-ZrO2 prepared from pure ZrO2 as a support.Characterization results showed that the 10%Ni-S2O82-=ZrO2 catalyst prepared by sodium borohydride reduction method presented a uniform pore structure,which effectively promoted the dispersion of metal Ni on the catalyst surface.Complete conversion of diphenyl ether(DPE)can be achieved under relatively mild conditions,and excellent hydrogenolysis activity is also demonstrated for other lignite derivatives containing C—O bonds.The possible reaction mechanism of DPE hydrogenolysis in the H2-isopropanol system was investigated.This work represents a significantstep forward in the design of highly efficientsolid super acid catalysts. 展开更多
关键词 Hydrogenation Diphenyl ether C―O cleavage ChemiCal reaction Ni-S2O82-=ZrO2 Catalyst
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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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Probing into Surface Sites of Fresh Mo_2N/Al_2O_3,Mo_2C/Al_2O_3 and MoP/Al_2O_3 Catalysts by CO Adsorption and In Situ FT-IR Spectroscopy 认领 引用 被引量：1
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作者 Zhang Jing Wu Weicheng +1 位作者 Yan Song Zhang Dan 《China Petroleum Processing & Petrochemical Technology》 CAS 2010年第4期43-45,共3页
The surface nature of fresh Mo2N/Al2O3, Mo2C/Al2O3 and/MoP/Al2O3 catalysts, which were synthesized directly in the IR cell to avoid passivation, were characterized by in situ IR spectroscopy with CO as a probe molecul... The surface nature of fresh Mo2N/Al2O3, Mo2C/Al2O3 and/MoP/Al2O3 catalysts, which were synthesized directly in the IR cell to avoid passivation, were characterized by in situ IR spectroscopy with CO as a probe molecule. CO adsorbed on fresh catalysts showed characteristic IR bands at 2045 cm-1 for Mo2N/Al2O3 catalyst, 2054 cm-1 for MozC/Al2O3 catalyst and 2037 cm-1 for MoP/Al2O3 catalyst, respectively. A strong band at 2200 cm-1 for Mo2N/Al2O3 catalyst, which could be ascribed to NCO species formed when CO reacted upon surface active nitrogen atoms, and a weak band at 2196 cm-1 for Mo2C/Al2O3 catalyst, which could be attributed to CCO species, were also detected. CO adsorbed on fresh Mo2N/Al2O3 catalyst, Mo2C/Al2O3 catalyst and MoP/Al2O3 catalyst, showed strong molecular adsorption, just like noble metals. Our experimental results are bolstered by direct IR evidence demonstrating the similarity in surface electronic property between the fresh Mo2N/Al2O3, Mo2C/Al2O3 and MoP/Al2O3 catalysts and noble metals. 展开更多
关键词 Mo2C/Al2O3 catalyst Mo2N/Al2O3 catalyst Mo2P/Al2O3 catalyst FT-IR CO
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Construction of bifunctional single-atom catalysts on the optimized β-Mo2C surface for highly selective hydrogenation of CO2 into ethanol 认领 引用 被引量：7
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作者 Xue Ye Junguo Ma +5 位作者 Wenguang Yu Xiaoli Pan Chongya Yang Chang Wang Qinggang Liu Yanqiang Huang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2022年第4期184-192,共9页
Green and economical CO2utilization is significant for CO2emission reduction and energy development.Here,the 1D Mo2C nanowires with dominant(101)crystal surfaces were modified by the deposition of atomic func... Green and economical CO2utilization is significant for CO2emission reduction and energy development.Here,the 1D Mo2C nanowires with dominant(101)crystal surfaces were modified by the deposition of atomic functional components Rh and K.While unmodifiedβMo2C could only convert CO2to methanol,the designed catalyst of K0.2Rh0.2/β-Mo2C exhibited up to 72.1%of ethanol selectivity at 150℃.It was observed that the atomically dispersed Rh could form the bifunctional active centres with the active carrierβMo2C with the synergistic effects to achieve highly specific controlled C–C coupling.By promoting the CO2adsorption and activation,the introduction of an alkali metal(K)mainly regulated the balanced performance of the two active centres,which in turn improved the hydrogenation selectivity.Overall,the controlled modification ofβMo2C provides a new design strategy for the highly efficient,lowtemperature hydrogenation of CO2to ethanol with single-atom catalysts,which provides an excellent example for the rational design of the complex catalysts. 展开更多
关键词 CO2hydrogenation C–C coupling Single-atom catalyst Ethanol synthesis
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Ultrafine Pt nanoparticles supported on double-shelled C/TiO2 hollow spheres material as highly efficient methanol oxidation catalysts 认领 引用 被引量：8
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作者 Xiaoyu Yue Yuguang Pu +2 位作者 Wen Zhang Ting Zhang Wei Gao 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2020年第10期275-282,共8页
Catalyst support is extremely important for future fuel cell devices.In this work,we developed doubleshelled C/TiO2(DSCT)hollow spheres as an excellent catalyst support via a template-directed method.The combination o... Catalyst support is extremely important for future fuel cell devices.In this work,we developed doubleshelled C/TiO2(DSCT)hollow spheres as an excellent catalyst support via a template-directed method.The combination of hollow structure,TiO2 shell and carbon layer results in excellent electron conductivity,electrocatalytic activity,and chemical stability.These uniformed DSCT hollow spheres are used as catalyst support to synthesize Pt/DSCT hollow spheres electrocatalyst.The resulting Pt/DSCT hollow spheres exhibited high catalytic performance with a current density of 462 mA mg^-1 for methanol oxidation reaction,which is 2.52 times higher than that of the commercial Pt/C.Furthermore,the increased tolerance to carbonaceous poisoning with a higher If/Ibratio and a better long-term stability in acid media suggests that the DSCT hollow sphere is a promising C/TiO2-based catalyst support for direct methanol fuel cells applications. 展开更多
关键词 Catalyst support C/TiO2 hollow sphere Metal-support interactions Methanol oxidation reaction
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Efficient catalytic conversion of jatropha oil to high grade biofuel on Ni-Mo2C/MCM-41 catalysts with tuned surface properties 认领 引用 被引量：4
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作者 Xiangze Du Keyao Zhou +4 位作者 Linyuan Zhou Xiaomei Lei Huiru Yang Dan Li Changwei Hu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2021年第10期425-435,I0012,共11页
The activity of Mo2 C-based catalyst on vegetable oil conversion into biofuel could be greatedly promoted by tuning the carbon content,while its modification mechanism on the surface properties remained elusive.Her... The activity of Mo2 C-based catalyst on vegetable oil conversion into biofuel could be greatedly promoted by tuning the carbon content,while its modification mechanism on the surface properties remained elusive.Herein,the exposed active sites,the particle size and Lewis acid amount of Ni-Mo2 C/MCM-41 catalysts were regulated by varying CH4 content in carbonization gas.The activity of Ni-Mo2 C/MCM-41 catalysts in jatropha oil(JO)conversion showed a volcano-like trend over the catalysts with increasing CH4 content from 15%to 50%in the preparation process.The one prepared by 25%CH4 content(NiMo2 C(25)/MCM-41)exhibited the outstanding catalytic performance with 83.9 wt%biofuel yield and95.2%C15-C18 selectivity.Such a variation of activity was ascribed to the most exposed active sites,the smallest particle size,and the lowest Lewis acid amount from Ni0 on the Ni-Mo2 C(25)/MCM-41 catalyst surface.Moreover,the Ni-Mo2 C(25)/MCM-41 catalyst could also effectively catalyze the conversion of crude waste cooking oil(WCO)into green diesel.This study offers an effective strategy to improve catalytic performance of molybdenum carbide catalyst on vegetable oil conversion. 展开更多
关键词 Ni-Mo2C/MCM-41 catalyst Carbonization Jatropha oil Crude waste cooking oil Green diesel
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Screening of MgO- and CeO_2-Based Catalysts for Carbon Dioxide Oxidative Coupling of Methane to C2+ Hydrocarbons 认领 引用 被引量：5
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作者 Istadi Nor Aishah Saidina Amin 《Journal of Natural Gas Chemistry》 2004年第1期23-35,共13页
The catalyst screening tests for carbon dioxide oxidative coupling of methane (CO2-OCM) have been investigated over ternary and binary metal oxide catalysts. The catalysts are prepared by doping MgO- and CeO2-based so... The catalyst screening tests for carbon dioxide oxidative coupling of methane (CO2-OCM) have been investigated over ternary and binary metal oxide catalysts. The catalysts are prepared by doping MgO- and CeO2-based solids with oxides from alkali (Li2O), alkaline earth (CaO), and transition metal groups (WO3 or MnO). The presence of the peroxide (O2-2) active sites on the Li2O2, revealed by Raman spectroscopy, may be the key factor in the enhanced performance of some of the Li2O/MgO catalysts. The high reducibility of the CeO2 catalyst, an important factor in the CO2-OCM catalyst activity, may be enhanced by the presence of manganese oxide species. The manganese oxide species increases oxygen mobility and oxygen vacancies in the CeO2 catalyst. Raman and Fourier Transform Infra Red (FT-IR) spectroscopies revealed the presence of lattice vibrations of metal-oxygen bondings and active sites in which the peaks corresponding to the bulk crystalline structures of Li2O, CaO, WO3 and MnO are detected. The performance of 5%MnO/15%CaO/CeO2 catalyst is the most potential among the CeO2-based catalysts, although lower than the 2%Li2O/MgO catalyst. The 2%Li2O/MgO catalyst showed the most promising C2+ hydrocarbons selectivity and yield at 98.0% and 5.7%, respectively. 展开更多
关键词 catalyst screening carbon dioxide oxidative coupling methane ternary metal oxide binary metal oxide MgO CeO2 C2+ hydrocarbons
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Silica-Grafted Ionic Liquids as Recyclable Catalysts for the Synthesis of 3,4-Dihydropyrano[c]chromenes and Pyra-no[2,3-c]pyrazoles 认领 引用 被引量：1
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作者 Khodabakhsh Niknam Abolhassan Piran 《Green and Sustainable Chemistry》 2013年第2期1-8,共8页
Silica-grafted N-propyl-imidazolium hydrogen sulfate ([Sipim]HSO4) is employed as a recyclable heterogeneous ionic liquid catalyst for the synthesis of 3,4-dihydropyrano[c]-chromenes by the reaction of aromatic aldehy... Silica-grafted N-propyl-imidazolium hydrogen sulfate ([Sipim]HSO4) is employed as a recyclable heterogeneous ionic liquid catalyst for the synthesis of 3,4-dihydropyrano[c]-chromenes by the reaction of aromatic aldehydes, malononitrile and 4-hydroxycoumarin at 100°C under solvent-free conditions. Also, heterogeneous ionic liquid catalyst was used for the synthesis of pyrano[2,3-c]-pyrazoles by the reaction of aromatic aldehydes, malononitrile and 3-methyl-l-phenyl-5-pyrazolone at 110°C under solvent-free conditions. The heterogeneous ionic liquid showed much the same efficiency when used in consecutive reaction runs. 展开更多
关键词 Silica-Grafted N-Propyl-Imidazolium Hydrogen Sulfate Aldehydes Pyrano[2 3-c]-Pyrazoles 3 4-Dihydropyrano[c]-chromenes Solvent-Free Heterogeneous Ionic Liquid Catalysts
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High-yield pentanes-plus production via hydrogenation of carbon dioxide:Revealing new roles of zirconia as promoter of iron catalyst with long-term stability 认领 引用 被引量：2
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作者 Sheraz Ahmed Junjung Rohmat Sugiarto +6 位作者 Wonjoong Yoon Muhammad Irshad Heuntae Jo Syeda Sidra Bibi Soek Ki Kim Muhammad Kashif Khan Jaehoon Kim 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2025年第3期431-442,共12页
The metal oxide promoter decisively influences the overall performance of Fe catalysts in the direct hydrogenation of CO2to C5+hydrocarbons.However,the roles of metal oxide promoter for Fe catalysts,particularly... The metal oxide promoter decisively influences the overall performance of Fe catalysts in the direct hydrogenation of CO2to C5+hydrocarbons.However,the roles of metal oxide promoter for Fe catalysts,particularly ZrO2,have rarely been investigated.To plug this knowledge gap,a new Fe catalyst promoted with Na and partially reduced ZrOx(Na-FeZrOx-9)was developed in this study;the catalyst helped produce C5+hydrocarbons in remarkably high yield(26.3%at 360℃).In contrast to ZrOx-free Fe-oxide,NaFeZrOx-9 exhibited long-term stability for CO2hydrogenation(750 h on-stream).The findings revealed multiple roles of ZrOx.Notably,ZrOxdecorated the Fe-oxide particles after calcination,thereby suppressing excess particle aggregation during the reaction,and acted as a"coke remover"to eliminate the carbon deposited on the catalyst surface.Additionally,oxygen vacancy(Ov)sites in ZrOxand electron transfer from ZrOxto Fe sites facilitated the adsorption of CO2at the Zr-Fe interface. 展开更多
关键词 CO2hydrogenation C5+hydroCarbons Fe catalysts ZrO2promoter Fischer Tropsch synthesis Catalyst deactivation
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Ni掺杂Mo2C/C双功能催化剂的制备及其电解水性能的研究 认领 引用 被引量：1
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作者 陈鸿明 范胜琪 +4 位作者 宋琪 蒋玲 陈拥军 李建保 张雪艳 《人工晶体学报》 CAS 北大核心 2025年第1期158-164,共7页
随着全球环境问题的日益突出,化石燃料的日益枯竭,寻找可再生能源成为了一项艰巨的任务。电解水制氢通过析氢反应(HER)和析氧反应(OER)同时产生氢气和氧气,是一种高效、绿色的制氢方法,吸引了越来越多的科研人员的兴趣。但是,目前商用... 随着全球环境问题的日益突出,化石燃料的日益枯竭,寻找可再生能源成为了一项艰巨的任务。电解水制氢通过析氢反应(HER)和析氧反应(OER)同时产生氢气和氧气,是一种高效、绿色的制氢方法,吸引了越来越多的科研人员的兴趣。但是,目前商用贵金属催化剂(Pt/C和RuO2/IrO2)价格贵且储量少,因此,开发具有高性能、低成本、高稳定性的非贵金属电催化剂成为了研究热点。本文通过简单的盐模板热解法成功制备了具有三维(3D)纳米片结构的Ni@Mo2C/C催化剂。通过X射线衍射(XRD)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)对Ni@Mo2C/C的组成、形貌及结构进行了表征,通过X射线光电子衍射仪(XPS)对元素组成及元素价态进行了分析,并考察了Ni@Mo2C/C的电化学性能。结果表明,在电流密度为10 mA·cm-2时,Ni@Mo2C/C催化剂的HER和OER的过电位分别为47和232 mV。在全解水测试中,仅需要1.61 V即可驱动10 mA·cm-2的电流密度,且可持续稳定工作100 h。 展开更多
关键词 Mo2C Ni掺杂 析氢反应 析氧反应 全解水 双功能催化剂
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Pt-SnO_2/C电催化剂异型直接乙醇燃料电池的性能 认领 引用 被引量：3
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作者 倪红军 吕灿灿 +2 位作者 王旭红 江学范 汤东 《江苏大学学报（自然科学版）》 EI CAS 北大核心 2012年第4期379-384,共6页
以掺杂石墨粉的中间相碳微球(MCMB/G)烧结管为阴极支撑体,采用浸涂工艺分别制备了扩散层和催化层,通过在其外表面包裹Nafion 117膜制得管状异型阴极并组装成异型直接乙醇燃料电池,采用水热乙二醇制备了适用于直接乙醇燃料电池的阳极电... 以掺杂石墨粉的中间相碳微球(MCMB/G)烧结管为阴极支撑体,采用浸涂工艺分别制备了扩散层和催化层,通过在其外表面包裹Nafion 117膜制得管状异型阴极并组装成异型直接乙醇燃料电池,采用水热乙二醇制备了适用于直接乙醇燃料电池的阳极电催化剂,并通过XRD,TEM和EDS等技术对其进行了表征.采用线性循环伏安曲线、交流阻抗等测试手段,对Pt-SnO2/C电催化剂异型直接乙醇燃料电池进行了性能测试,并考察了温度、氧气流量等对电池极化性能的影响.结果表明:异型电池阻抗大于传统的平板电池,但其活化后电池阻抗明显下降;较高的氧气流量和较高的工作温度有利于提高电池性能;60℃条件下,Pt-SnO2/C电催化剂异型直接乙醇燃料电池功率密度达到8.5 mW.cm-2. 展开更多
关键词 异型直接乙醇燃料电池 Pt-SnO2/C电催化剂 管状阴极 电池性能 功率密度
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Systematic variation of the sodium/sulfur promoter content on carbon-supported iron catalysts for the Fischer–Tropsch to olefins reaction 认领 引用 被引量：3
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作者 Martin Oschatz Nynke Krans +1 位作者 Jingxiu Xie Krijn P.de Jong 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2016年第6期985-993,共9页
The Fischer–Tropsch to olefins（FTO） process is a method for the direct conversion of synthesis gas to lower C–Colefins. Carbon-supported iron carbide nanoparticles are attractive catalysts for this reaction.The ca... The Fischer–Tropsch to olefins（FTO） process is a method for the direct conversion of synthesis gas to lower C–Colefins. Carbon-supported iron carbide nanoparticles are attractive catalysts for this reaction.The catalytic activity can be improved and undesired formation of alkanes can be suppressed by the addition of sodium and sulfur as promoters but the influence of their content and ratio remains poorly understood and the promoted catalysts often suffer from rapid deactivation due to particle growth. A series of carbon black-supported iron catalysts with similar iron content and nominal sodium/sulfur loadings of 1–30/0.5–5 wt% with respect to iron are prepared and characterized under FTO conditions at 1and 10 bar syngas pressure to illuminate the influence of the promoter level on the catalytic properties.Iron particles and promoters undergo significant reorganization during FTO operation under industrially relevant conditions. Low sodium content（1–3 wt%） leads to a delay in iron carbide formation. Sodium contents of 15–30 wt% lead to rapid loss of catalytic activity due to the covering of the iron surface with promoters during particle growth under FTO operation. Higher activity and slower loss of activity are observed at low promoter contents（1–3 wt% sodium and 0.5–1 wt% sulfur） but a minimum amount of alkali is required to effectively suppress methane and C–Cparaffin formation. A reference catalyst support（carbide-derived carbon aerogel） shows that the optimum promoter level depends on iron particle size and support pore structure. 展开更多
关键词 Fischer–Tropsch to olefins synthesis C2–C4 olefins Iron catalysts Promoters Carbon supports
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On the role of cobalt carbidization in higher alcohol synthesis over hydrotalcite-based Co-Cu catalysts 认领 引用 被引量：2
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作者 Janine Nebel Stefan Schmidt +3 位作者 Qiushi Pan Katrin Lotz Stefan Kaluza Martin Muhler 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2019年第11期1731-1740,共10页
Co-Cu-based catalysts are widely applied in higher alcohol synthesis (HAS) from synthesis gas. Although the nature of the active sites is still not fully understood, the formation of Co2C under HAS conditions seems to... Co-Cu-based catalysts are widely applied in higher alcohol synthesis (HAS) from synthesis gas. Although the nature of the active sites is still not fully understood, the formation of Co2C under HAS conditions seems to play a major role. A CO pretreatment procedure was developed allowing a systematic investigation of the influence of cobalt carbidization on the structural properties and catalytic performance of the catalysts. By exposing the catalyst to a CO-containing atmosphere prior to HAS, Co enrichment of the catalyst surface occurred followed by carbide formation. This surface modification decreased the formation of hydrocarbons and enhanced the formation of C2+OH. The catalyst pretreated with CO at 20 bar achieved the highest selectivity to ethanol and the lowest hydrocarbon selectivity. 展开更多
关键词 Higher alcohol synthesis Co-Cu catalyst Co2C CO pretreatment
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N掺杂C包覆FeNi/Mo2C复合纳米材料析氧性能 认领 引用
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作者 陈京帅 陈环宇 陈超 《当代化工》 CAS 2025年第6期1261-1270,共10页
为提升析氧反应(OER)电催化剂的活性,在惰性气氛下热解合成N掺杂碳纳米片(NC)以及N掺杂C包覆FeNi合金、Mo2C和FeNi/Mo2C复合材料(NC@FeNi、NC@Mo2C、NC@FeNi-Mo2C)。XRD证实了3种复合材料的成功合成。拉曼光谱显示NC@FeNi-M... 为提升析氧反应(OER)电催化剂的活性,在惰性气氛下热解合成N掺杂碳纳米片(NC)以及N掺杂C包覆FeNi合金、Mo2C和FeNi/Mo2C复合材料(NC@FeNi、NC@Mo2C、NC@FeNi-Mo2C)。XRD证实了3种复合材料的成功合成。拉曼光谱显示NC@FeNi-Mo2C的ID/IG值为2.75,显著高于其他3种材料,表明该材料具有更多结构缺陷,有助于加速离子转移,提高电化学性能。BET显示NC@FeNi-Mo2C比表面积达到70.41 m2·g-1,能更好促进电解质渗透,提升电催化性能。SEM和TEM电镜可观察到FeNi、Mo2C和FeNi-Mo2C被均匀封装在氮掺杂纳米碳材料中。利用XPS确定催化剂合金化引起的表面化学和电子结构变化。电化学析氧性能表征结果表明,相较于NC、NC@FeNi和NC@Mo2C,NC@FeNi-Mo2C杂化物具有较低的超电势(188 mV)、较小的Tafel斜率(18.551 mV·dec-1)、较高的稳定性14 h,其对OER表现出高效的电催化活性。 展开更多
关键词 析氧反应 氮掺杂纳米碳 FeNi Mo2C 催化剂 电解质 动力学
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FT-IR Spectroscopic Investigation of Co-adsorption of Acetonitrile and CO on Fresh Mo2C/Al2O3Catalyst 认领 引用 被引量：1
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作者 Zhang Jing Wu Weicheng Jin Ziming 《China Petroleum Processing & Petrochemical Technology》 CAS 2009年第4期59-61,共3页
The adsorption of acetonitrile and its co-adsorption with CO on fresh Mo2C/Al2O3catalyst have been studied by insitu FT-IR spectroscopy.Linearly adsorbed CH_3CN and CH3CH2NH2were formed after CH_3CN ... The adsorption of acetonitrile and its co-adsorption with CO on fresh Mo2C/Al2O3catalyst have been studied by insitu FT-IR spectroscopy.Linearly adsorbed CH_3CN and CH3CH2NH2were formed after CH_3CN adsorption on the Mo_2C/Al_2O3catalyst.The appearance of a strong band at 1578 cm-1indicates that CH_3CN was reactive with hydrogen on the Mo_2C/Al_2O3catalyst. 展开更多
关键词 Mo2C/Al2O3catalyst FT-IR spectroscopy CO acctonitrile
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Syngas-promoted selective catalytic hydrogenolysis of cellulose into C6-ketones 认领 引用
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作者 Zhiyang Tang Xianyuan Wu +7 位作者 Jie Qu Xinjun He Fukun Li Jinxing Long Qiang Zeng Haixia Su Hongyan He Xuehui Li 《Green Energy & Environment》 SCIE EI CAS CSCD 2026年第5期1393-1401,共9页
Selective hydrogenolysis of cellulose into C6-ketones offers a promising route for the production of high-value carbonyl compounds.However,conventional metal-catalyzed hydrogenolysis methods typically rely on exter... Selective hydrogenolysis of cellulose into C6-ketones offers a promising route for the production of high-value carbonyl compounds.However,conventional metal-catalyzed hydrogenolysis methods typically rely on externally added acids and require high-purity H2.Herein,we report an alternative syngas-promoted hydrogenolysis method that eliminates these dual dependencies while enabling the selective transformation of cellulose into value-added C6-ketones.Under optimal conditions,using a commercial Pd/C catalyst at 230℃and 3.0 MPa total pressure(H2/CO=1.5/1.5 MPa)for 2 h,the yield of C6-ketones reached 37.8%,representing a 6.8-fold enhancement compared to that obtained under pure H2.Mechanistic studies demonstrated a dual promotional effect of CO in directing cellulose to C6-ketones.First,competitive adsorption of CO on Pd active sites suppresses excessive hydrogenation and undesired hydrogenolysis of cellulose-derived intermediates.Second,CO participates in the water-gas shift(WGS)reaction(CO+H2O⇌CO2+H2),generating carbonic acid(H2CO3)in-situ via CO2+H2O⇌H2CO3,which provides a controllable acidic environment that promotes key intermediate transformations associated with C6-ketone precursor formation. 展开更多
关键词 Cellulose Hydrogenolysis C6-ketones Pd/C catalyst Syngas(H2/CO)
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Reaction kinetics and phase behavior in the chemoselective hydrogenation of 3‐nitrostyrene over Co‐N‐C single‐atom catalyst in compressed CO2 认领 引用
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作者 Dan Zhou Leilei Zhang +5 位作者 Wengang Liu Gang Xu Ji Yang Qike Jiang Aiqin Wang Jianzhong Yin 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2021年第9期1617-1624,共8页
Single‐atom catalysts(SACs)have demonstrated excellent performances in chemoselective hydrogenation reactions.However,the employment of precious metals and/or organic solvents compromises their sustainability.Herein,... Single‐atom catalysts(SACs)have demonstrated excellent performances in chemoselective hydrogenation reactions.However,the employment of precious metals and/or organic solvents compromises their sustainability.Herein,we for the first time report the chemoselective hydrogenation of 3‐nitrostyrene over noble‐metal‐free Co‐N‐C SAC in green solvent—compressed CO2.An interesting inverted V‐curve relation is observed between the catalytic activity and CO2 pressure,where the conversion of 3‐nitrostyrene reaches the maximum of 100%at 5.0 MPa CO2(total pressure of 8.1 MPa).Meanwhile,the selectivities to 3‐vinylaniline at all pressures remain high(>99%).Phase behavior studies reveal that,in sharp contrast with the single phase which is formed at total pressure above 10.8 MPa,bi‐phase composed of CO2/H2gas‐rich phase and CO2‐expanded substrate liquid phase forms at total pressure of 8.1 MPa,which dramatically changes the reaction kinetics of the catalytic system.The reaction order with respect to H2pressure decreases from~0.5 to zero at total pressure of 8.1 MPa,suggesting the dissolved CO2 in 3‐nitrostyrene greatly promotes the dissolution of H2in the substrate,which is responsible for the high catalytic activity at the peak of the inverted V‐curve. 展开更多
关键词 Single‐atom catalyst Co‐N‐C CO2 Phase behavior ChemoseleCtive hydrogenation 3‐Nitrostyrene
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Studies on the Hydrogenation of Acetonitrile over Fresh Mo_2C/γ-Al_2O_3 Catalyst by In-situ IR Spectroscopy 认领 引用
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作者 Zhang Jing Wu Weicheng +3 位作者 Liu Chuang Ding Xiaoguang Chu Gang Zhang Jianguo 《China Petroleum Processing & Petrochemical Technology》 CAS 2015年第3期61-66,共6页
The adsorption of acetonitrile, the co-adsorption of acetonitrile with CO, and hydrogenation of acetonitrile on fresh Mo2C/γ-Al2O3 catalyst were studied by in situ IR spectroscopy. It was found out that CH3CN exhibit... The adsorption of acetonitrile, the co-adsorption of acetonitrile with CO, and hydrogenation of acetonitrile on fresh Mo2C/γ-Al2O3 catalyst were studied by in situ IR spectroscopy. It was found out that CH3CN exhibited strong interaction with the fresh Mo2C/γ-Al2O3 catalyst and was adsorbed mainly on Moδ+ sites of fresh Mo2C/γ-Al2O3 catalyst. Moreover, CH3CN could affect the shifting of IR spectra for CO adsorption towards a lower wave number. The IR spectroscopic study on acetonitrile hydrogenation showed that CH3CN could be easily hydrogenated in the presence of H2 on the Mo2C/γ-Al2O3 catalyst. Furthermore, it was observed that CH3 CN could be selectively hydrogenated to imines on fresh Mo2C/γ-Al2O3 catalyst. Additionally, the active sites of fresh Mo2C/γ-Al2O3 catalyst might be covered with coke during the hydrogenation reaction of acetonitrile. The treatment of catalyst with hydrogen at 673 K could not completely remove coke deposits on the surface of the Mo2C/γ-Al2O3 catalyst. 展开更多
关键词 fresh Mo2C/γ-Al2O3 catalyst hydrogenation acetonitrile in situ IR spectroscopy
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In Situ IR Spectroscopic Study on the Hydrogenation of 1,3-Butadiene on Fresh Mo_2C/γ-Al_2O_3 Catalyst 认领 引用
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作者 Zhang Jing Wu Weicheng Liu Shiyang 《China Petroleum Processing & Petrochemical Technology》 CAS 2014年第4期32-37,共6页
The surface species formed from the adsorption of 1,3-butadiene and 1,3-butadiene hydrogenation over the fresh Mo2C/γ-Al2O3 catalyst was studied by in situ IR spectroscopy. It is found that 1,3-butadiene adsorption o... The surface species formed from the adsorption of 1,3-butadiene and 1,3-butadiene hydrogenation over the fresh Mo2C/γ-Al2O3 catalyst was studied by in situ IR spectroscopy. It is found that 1,3-butadiene adsorption on the Mo2C/γ-Al2O3 catalyst mainly forms π-adsorbed butadiene(πs and πd) and σ-bonded surface species. These species are adsorbed mainly on the surface Moδ+(0<δ<2) sites as evidenced by co-adsorption of 1,3-butadiene and CO on the fresh Mo2C/γ-Al2O3 catalyst. The IR spectrometric analysis show that hydrogenation of 1,3-butadiene over fresh Mo2C/γ-Al2O3 catalyst produces mainly butane coupled with a small portion of butene. The selectivity of butene during the hydrogenation of 1,3-butadiene over fresh Mo2C/γ-Al2O3 catalyst might be explained by the adsorption mode of adsorbed 1,3-butadiene. Additionally, the active sites of the fresh Mo2C/γ-Al2O3 catalyst may be covered by coke during the hydrogenation reaction of 1,3-butadiene. The treatment with hydrogen at 673 K cannot remove the coke deposits from the surface of the Mo2C/γ-Al2O3 catalyst. 展开更多
关键词 fresh Mo2C/γ-Al2O3 catalyst hydrogenation 1,3-butadiene in situ IR spectroscopy
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