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Hydrogen-driven metal-support interaction in Ni-CeO2 catalysts boosting low-temperature CO2 methanation 认领 引用
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作者 Ru Zhao Siyuan Xu +5 位作者 Junliang Xia Mingxue Wang Xiaoyan Han Yu Xie Qiulin Zhang Ping Ning 《Journal of Rare Earths》 SCIE EI CAS CSCD 2026年第7期2097-2105,I0004,共9页
Converting CO2 to CH4 under mild conditions represents a promising strategy for carbon emission reduction and synthetic natural gas production,yet it remains challenging.In this work,we accelerated low-temperatu... Converting CO2 to CH4 under mild conditions represents a promising strategy for carbon emission reduction and synthetic natural gas production,yet it remains challenging.In this work,we accelerated low-temperature CO2 hydrogenation over Ni-CeO2 catalysts by optimizing metal-support interactions through H2-driven reconstruction.The catalyst reduced at 400℃(Ni-CeO2-400R)achieved 84.3%CO2conversion with 100%CH4 selectivity even at a low temperature of 250℃.Various in situ spectroscopic characterizations(X-ray photoelectron spectroscopy(XPS),Raman,and diffused reflectance infrared Fourier transform spectroscopy(DRIFTS))and H2/D2 isotopic exchange experiments reveal that the appropriate interaction in Ni-CeO2 motivates the dispersion of metallic Ni sites and the generation of oxygen vacancies,thereby promoting the activation of H2 and CO2 molecules,respectively.Therefore,CO2 is efficiently adsorbed and converted into reactive intermediates and finally hydrogenated to CH4through carbonyl and formate pathways simultaneously.These findings underscore the critical role of tailored metal-support interactions in designing advanced CO2 hydrogenation catalysts. 展开更多
关键词 Low-temperature CO2methanation Ni/CeO2catalysts H2treatment Metal-support interaction Rare earths
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Size-Dependent Hydrogen Dissociation Capacity in Ni/CeO2 Catalysts for Low-Temperature CO2 Methanation 认领 引用
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作者 Yu Xie Zhiyu Li +6 位作者 Xiaoyan Han Mingxue Wang Ru Zhao Siyuan Xu Qiulin Zhang Ping Ning Jiming Hao 《Rare Metals》 SCIE EI CAS CSCD 2026年第2期718-732,共15页
Converting CO2to CH4 under mild conditions is a promising strategy for solving environmental and energy problems,but also a challenge.In this work,the low-temperature CO2 hydrogenation process over Ni/CeO2 ca... Converting CO2to CH4 under mild conditions is a promising strategy for solving environmental and energy problems,but also a challenge.In this work,the low-temperature CO2 hydrogenation process over Ni/CeO2 catalysts was significantly accelerated by optimizing the H2 dissociation ability of Ni through the size effect,thus A-Ni/CeO2 with an average size of 4.9 nm achieved 83.4%CO2conversion with~100%CH4 selectivity even at 225℃.Systematic H2/D2 isotopic exchange experiments,in situ spectroscopic characterizations,and density functional theory(DFT)calculations reveal that the enhanced H2 activation ability not only promoted the creation of oxygen vacancies and hydroxyl group favorable for CO2 adsorption/activation in the pre-reduction process,but also the simultaneous hydrogenation of reactive intermediates belonging to carbonyl and formate pathway into CH4 in the reaction process.This fundamental understanding of the H2 dissociation effect on CO2 activation and hydrogenation provides critical insights for designing catalysts with considerable low-temperature activity,which significantly reduces energy consumption and operating costs for industrial CO2 conversion. 展开更多
关键词 CO2activation H2dissociation low-temperature CO2methanation Ni/CeO2catalysts size effect
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临氢热解制备高分散Ni/SiO2及萘加氢性能 认领 引用
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作者 梁正 罗雷 +2 位作者 王小曼 苏秋成 仇松柏 《中山大学学报（自然科学版）（中英文）》 CAS CSCD 北大核心 2026年第2期124-135,共12页
萘作为煤焦油中含量最为丰富的多环芳烃,不仅是一种环境污染物,也是一种高附加值的化工原料。通过催化加氢,萘可转化为具有更高价值的四氢萘和十氢萘。在各类加氢催化剂中,负载型镍基材料因其成本优势,被视为潜在的非贵金属替代方案。... 萘作为煤焦油中含量最为丰富的多环芳烃,不仅是一种环境污染物,也是一种高附加值的化工原料。通过催化加氢,萘可转化为具有更高价值的四氢萘和十氢萘。在各类加氢催化剂中,负载型镍基材料因其成本优势,被视为潜在的非贵金属替代方案。本研究采用柠檬酸(CA)辅助的溶胶凝胶法,结合临氢热解策略,成功制备了高分散Ni/SiO2催化剂。通过系统表征与催化性能测试,重点探究了柠檬酸用量、热解气氛及临氢热解温度对催化剂物化性质与萘加氢性能的调控规律。结果表明,在优化的柠檬酸配比与H2气氛下热解所得的w=20%Ni/SiO2-CA(H2)催化剂,表现出优于无CA对照组及其他热解工艺催化剂的加氢活性。在相同低温反应条件下,其活性显著高于商业Ru/C催化剂。本研究为开发高效非贵金属加氢催化剂提供了新思路与实验依据。 展开更多
关键词 高分散Ni/SiO2催化剂 溶液凝胶法 临氢热解 萘加氢反应
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Photothermal dry reforming of methane reaction over (Ni/Ce0.8Zr0.2O2)@SiO2 catalysts: The Ni content regulation 认领 引用 被引量：1
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作者 Xiaoyan Tian Yu Shi +1 位作者 Jianming Zhang Fagen Wang 《Green Energy & Environment》 SCIE EI CAS CSCD 2025年第8期1751-1763,共13页
Dry reforming of methane(DRM)converts CH4 and CO2 to syngas.Photothermal DRM,which integrates temperature and light,is a sustainable method for storing solar energy in molecules.However,challenges such as limited l... Dry reforming of methane(DRM)converts CH4 and CO2 to syngas.Photothermal DRM,which integrates temperature and light,is a sustainable method for storing solar energy in molecules.However,challenges such as limited light absorption,low photocarrier separation efficiency,Ni sintering,and carbon deposition hinder DRM stability.Herein,we regulated Ni contents in(Ni/Ce0.8Zr0.2O2)@SiO2 catalysts to enhance the optical characteristics while addressing Ni sintering and carbon deposition issues.The(3Ni/Ce0.8Zr0.2O2)@SiO2 catalyst had insufficient Ni content,while the(9Ni/Ce0.8Zr0.2O2)@SiO2 catalyst showed excessive carbon deposition,leading to lower stability compared to the(6Ni/Ce0.8Zr0.2O2)@SiO2 catalyst,which achieved CH4 and CO2 rates to 231.0 μmol gcat-1s-1 and 294.3 μmol gcat-1s-1 ,respectively,at 973 K,with only 0.2 wt.%carbon deposition and no Ni sintering.This work adjusted Ni contents in(Ni/Ce0.8Zr0.2O2)@SiO2 catalysts to enhance DRM performance,which has implications for improving other reactions. 展开更多
关键词 Photothermal DRM (Ni/Ce0.8Zr0.2O2)@SiO2catalyst Ni regulation Carbon deposition
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CO2-assisted two-step pyrolysis fabrication of hierarchical porous Ni/ZrO2catalyst for low-temperature dry reforming of methane 认领 引用
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作者 Xinrong He Bang Xu +4 位作者 Sanli Tang Xiaoguang Liu Qibin Liu Zongguo Wen Maohong Fan 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第5期163-174,共12页
A new strategy for preparing highly dispersed,richer oxygen vacancies Ni/ZrO2catalysts derived from UiO-66-NH2is reported via pyrolysis-calcination removal of the ligands under N2,CO2,and Air atmospheres f... A new strategy for preparing highly dispersed,richer oxygen vacancies Ni/ZrO2catalysts derived from UiO-66-NH2is reported via pyrolysis-calcination removal of the ligands under N2,CO2,and Air atmospheres followed by loading Ni with 5 wt.%via wet impregnation method.Subsequently,the low-temperature dry reforming of methane(DRM)reaction over the obtained Ni/ZrO2catalysts was preliminarily investigated.The results indicated that the Ni/ZrO2C catalyst,obtained by two-step pyrolysis in CO2,contained smaller Ni particles with a size of only 5-7 nm and possessed a hierarchical porous structure,as well as richer oxygen vacancies and basic active sites compared to the other two catalysts.Its catalytic activity in the DRM reaction presented the highest initial conversion of CH4(35%)and CO2(26%)at 600℃,which was 5%higher than that of the Ni/ZrO2-N and Ni/ZrO2-O catalysts obtained by two-step pyrolysis under an N2atmosphere and one-step pyrolysis under an air atmosphere,respectively.Meanwhile,an in-situ DRIFTS experiment revealed that Ni/ZrO2-C could enhance the adsorption and activation of CO2by promoting the formation of formate as an intermediate of CO hydrogenation and reverse water-gas shift(RWGS)reactions,which in turn facilitates the decomposition of CH4. 展开更多
关键词 Low-temperature dry reforming of methane Pyrolysis UiO-66-NH2 MOF-derived Ni/ZrO2catalysts
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CaO-stabilized tetragonal ZrO2support for high-performance Ni—Fe alloy catalysts in dry reforming of methane 认领 引用
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作者 Yubin Li Jiawei Wang +5 位作者 Yuxin Kang Nana Chen Ru Yan Li Qiu Sha Li Xiaoliang Yan 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2026年第4期230-242,共13页
Tetragonal ZrO2(t-ZrO2)with abundant oxygen vacancies offers a viable approach to support Ni catalysts for enhanced catalytic performance in dry reforming of methane(DRM).However,the application of t-ZrO2is l... Tetragonal ZrO2(t-ZrO2)with abundant oxygen vacancies offers a viable approach to support Ni catalysts for enhanced catalytic performance in dry reforming of methane(DRM).However,the application of t-ZrO2is limited by its inherent thermal instability.Herein,we evaluated Ni3Fe1alloy supported on m-ZrO2and t-ZrO2stabilized with CaO or Y2O3for DRM.Ni3Fe1/m-ZrO2showed inferior activity,while Ni3Fe1/Y2O3—t-ZrO2retained t-ZrO2structure but exhibited poor stability.In contrast,Ni3Fe1/CaO—tZrO2demonstrated high stability,maintaining CH4 and CO2conversions of 78.0%and 87.2%with H2/CO ratio of 0.95 at 800℃.This is attributed to the CaO dopant,which not only stabilized t-ZrO2phase but also strengthened metal—support interaction at the Ni3Fe1—ZrO2interface,increased oxygen vacancy concentration,and improved surface basicity.Notably,these significantly facilitated CH4 dissociation and CO2activation,establishing an effective balance between carbon formation and gasification,thereby improving the coke resistance of the catalyst. 展开更多
关键词 Ni—Fe alloy Dry reforming of methane Carbon dioxide Tetragonal ZrO2 Catalyst support Catalysis
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Ni-O-Nd active structure over inverse Nd2O3/Ni catalyst enables efficient CO2 hydrogenation to methane 认领 引用
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作者 Mingxue Wang Junliang Xia +4 位作者 Yu Xie Jinyan Cao Jianjun Chen Qiulin Zhang Ping Ning 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第8期979-990,I0021,共12页
Catalytic CO2methanation exhibited significant potential for carbon reduction and energy storage,but still faced tough challenges due to poor abilities for CO2activation and oxygenate hydrogenation at low temper... Catalytic CO2methanation exhibited significant potential for carbon reduction and energy storage,but still faced tough challenges due to poor abilities for CO2activation and oxygenate hydrogenation at low temperatures.Herein,an inverse Nd2O3/Ni catalyst with Ni‑O‑Nd structures as catalytically active sites was facilely constructed.It achieved>80%CO2conversion with a CH4space‑time yield up to 143.4 mmol gcat-1h-1at 225℃and 1 bar,which far exceeded its counterpart(Nd2O3+Ni,27.8 mmol h-1),representing one of the state‑of‑the‑art CO2methanation catalysts.Systematic characterizations revealed that the well‑dispersed Nd species on Ni substrate over inverse Nd2O3/Ni enhanced Ni‑Nd2O3interaction and promoted the formation of Ni‑O‑Nd interface.Then,its surface basicity and local environment of Ni was greatly optimized,thus enhancing CO2adsorption and oxygenate hydrogenation abilities.In situ spectra and DFT calculations revealed that instead of the sole carbonyl pathway over Nd2O3+Ni,the Ni‑O‑Nd interface over the inverse Nd2O3/Ni brought a supplementary formate pathway with low energy barriers.Besides,it enabled lower energy barriers for CO2dissociation(0.30 vs 0.61 eV)and CO∗hydrogenation(0.70 vs 0.84 eV).Consequently,CO2activation and oxygenate hydrogenation ability over this inverse catalyst could be greatly enhanced,contributing to its excellent activity. 展开更多
关键词 CO2methanation Inverse Nd2O3/Ni catalyst Ni–O–Nd structure HCOO*and CO*pathway Oxygenate hydrogenation
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Ni/CaO-ZrO2-Al2O3 catalyst for CO2methanation:Enhanced low-temperature activity and high-temperature sintering resistance 认领 引用
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作者 LI Jia SUI Qingqing +2 位作者 JIANG Yanan BAI Yang LIU Yuan 《燃料化学学报（中英文）》 EI CAS CSCD 北大核心 2026年第6期102-112,共11页
Ni/Al2O3 is regarded as one of the most promising catalysts for industrial application in CO2methanation,but is still plagued by issues of inadequate low-temperature activity and thermal sintering.In response... Ni/Al2O3 is regarded as one of the most promising catalysts for industrial application in CO2methanation,but is still plagued by issues of inadequate low-temperature activity and thermal sintering.In response to these challenges,an Ni/CaO-ZrO2-Al2O3 catalyst with high low-temperature activity and robust high-temperature sintering resistance was prepared by introducing Ca and Zr promoters.Under the reaction conditions of 250 and a space velocity of 30000 mL/(g·h),the CO2conversion and methane space-time yield reached 96%and 257.5 mmol/(g·h),respectively.In addition,the Ca-Zr dual-promoted Ni/CaO-ZrO2-Al2O3 catalyst exhibited a smaller increase in the Ni particle size and less activity loss than the Ca-promoted catalyst in a 200 h aging test at 600.The Ca and Zr promoters can not only improve the Ni dispersion but also enhance the surface basicity,resulting in excellent low-temperature activity.Moreover,the Zr promoter suppresses the transformation of Ca species into CaCO3 through solid-phase reaction under operating conditions,thereby inhibiting Ni sintering and ensuring high-temperature stability.This work provides a new promoter design strategy for the development of high-performance Ni-based catalysts for CO2methanation. 展开更多
关键词 methanation Ni/Al2O3catalyst low-temperature activity sintering resistance
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Regulating the local environment of Ni single-atom catalysts with heteroatoms for efficient CO2 electroreduction 认领 引用
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作者 Gang Wang Imran Muhammad +2 位作者 Hui-Min Yan Jun Li Yang-Gang Wang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2025年第7期120-129,共10页
The Ni single-atom catalyst dispersed on nitrogen doped graphene support has attracted much interest due to the high selectivity in electro-catalyzing CO2reduction to CO,yet the chemical inertness of the metal cent... The Ni single-atom catalyst dispersed on nitrogen doped graphene support has attracted much interest due to the high selectivity in electro-catalyzing CO2reduction to CO,yet the chemical inertness of the metal center renders it to exhibit electrochemical activity only under high overpotentials.Herein,we report P-and S-doped Ni single-atom catalysts,i.e.symmetric Ni1/PN4and asymmetric Ni1/SN3C can exhibit high catalytic activity of CO2reduction with stable potential windows.It is revealed that the key intermediate*COOH in CO2electroreduction is stabilized by heteroatom doping,which stems from the upward shift of the axial dz2orbital of the active metal Ni atom.Furthermore,we investigate the potential-dependent free energetics and dynamic properties at the electrochemical interface on the Ni1/SN3C catalyst using ab initio molecular dynamics simulations with a full explicit solvent model.Based on the potential-dependent microkinetic model,we predict that S-atom doped Ni SAC shifts the onset potential of CO2electroreduction from–0.88 to–0.80 V vs.RHE,exhibiting better activity.Overall,this work provides an in-depth understanding of structure-activity relationships and atomic-level electrochemical interfaces of catalytic systems,and offers insights into the rational design of heteroatom-doped catalysts for targeted catalysis. 展开更多
关键词 Ni single-atom catalyst Heteroatom doping CO2electroreduction Ab initio molecular dynamics
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改性Ni/SiO2催化碳五石油树脂加氢性能研究 认领 引用
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作者 张孟旭 刘强 倪晶晶 《石油化工》 CAS CSCD 北大核心 2025年第3期318-324,共7页
以硅溶胶为硅源、硝酸镍为镍源,采用共沉淀法并与丙三醇修饰改性相结合制备了高镍含量Ni/SiO2催化剂,通过N2吸附-脱附、XRD、H2-TPR、H2-TPD、SEM、FTIR等方法对催化剂结构与性能进行了表征。实验结果表明,丙三醇的添加有效减... 以硅溶胶为硅源、硝酸镍为镍源,采用共沉淀法并与丙三醇修饰改性相结合制备了高镍含量Ni/SiO2催化剂,通过N2吸附-脱附、XRD、H2-TPR、H2-TPD、SEM、FTIR等方法对催化剂结构与性能进行了表征。实验结果表明,丙三醇的添加有效减少了Ni/SiO2催化剂上镍活性组分的团聚,促进孔结构的增大,使镍晶粒与载体间具有更强的相互作用力。添加丙三醇的镍催化剂对碳五石油树脂的加氢性能比同类型商用催化剂更有优势。 展开更多
关键词 碳五石油树脂 Ni/SiO2催化剂 丙三醇 加氢性能
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乙二醇修饰促进的Ni/SiO2催化剂碳五石油树脂加氢性能 认领 引用
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作者 张孟旭 李明杰 +4 位作者 邰盛彪 管庆伟 叶涛 钱颖 沈亚峰 《工业催化》 CAS 2025年第1期51-57,共7页
以硅酸钠或硅溶胶为硅源,硝酸镍为镍源,采用共沉淀法与乙二醇修饰改性相结合制备了Ni/SiO2催化剂。研究发现,使用乙二醇修饰Ni/SiO2催化剂减少了其干燥和焙烧过程中的羟基缩聚(Ni-O-Ni)反应,从而避免镍活性组分团聚。N2吸附-... 以硅酸钠或硅溶胶为硅源,硝酸镍为镍源,采用共沉淀法与乙二醇修饰改性相结合制备了Ni/SiO2催化剂。研究发现,使用乙二醇修饰Ni/SiO2催化剂减少了其干燥和焙烧过程中的羟基缩聚(Ni-O-Ni)反应,从而避免镍活性组分团聚。N2吸附-脱附、H2-TPR、H2-TPD、XRD、SEM等表征结果表明,采用乙二醇修饰制备的催化剂比表面积、孔容和孔径明显增大,活性金属镍与载体二氧化硅间的相互作用力增强,镍分散性高,暴露的镍活性位多。碳五石油树脂加氢结果表明,采用乙二醇修饰改性制备的催化剂加氢性能明显提升。 展开更多
关键词 石油化学工程 碳五石油树脂 加氢 改性 Ni/SiO2催化剂 乙二醇
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CeO2修饰NiCuMgAl混合金属催化剂及催化甲烷干重整研究 认领 引用
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作者 吴以星 焦卫红 +4 位作者 李彪 毕晨瑶 王艳 张静 刘一鸣 《分子催化（中英文）》 CAS CSCD 北大核心 2026年第3期305-320,I0002,共16页
甲烷干重整反应可将两种温室气体同时转化为合成气,是一种兼具环保效益与资源化利用价值的重要反应,但是该反应仍面临能耗高、催化剂因积炭和烧结易失活等关键挑战.本研究采用尿素水热法制备NiCuMgAl水滑石前驱体,并通过浸渍法引入不同... 甲烷干重整反应可将两种温室气体同时转化为合成气,是一种兼具环保效益与资源化利用价值的重要反应,但是该反应仍面临能耗高、催化剂因积炭和烧结易失活等关键挑战.本研究采用尿素水热法制备NiCuMgAl水滑石前驱体,并通过浸渍法引入不同浓度的硝酸铈溶液,经煅烧还原后得到一系列CeO2负载量分别为5%、10%、15%、20%的NiCuMgAl催化剂,系统考察了CeO2含量对催化剂结构、表面性质及甲烷干重整性能的影响.结合X射线衍射、氮气物理吸附-脱附、扫描电镜、透射电镜、X射线光电子能谱、二氧化碳与氨气程序升温脱附、傅立叶红外光谱和热重对催化剂进行表征.结果表明,Ni-Cu合金的形成有效抑制了积炭生成,CeO2的引入则产生了丰富的氧空位.其中NiCuMgAl-15%Ce催化剂具有最高的氧空位浓度(33.80%),同时表现出最强的中强碱强度(250.4℃)和中强酸强度(240.7℃),形成了理想的酸碱协同效应.该催化剂在600℃、质量空速36000 mL·g-1·h-1条件下,CH4转化率达36.2%,CO2转化率达53.1%,稳定运行32 h,积炭量仅6.2%,显著优于未改性及CeO2含量过高或过低的催化剂. 展开更多
关键词 甲烷干重整反应 Ni基催化剂 合金 CeO2
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Effect of SiO2 addition on NH4HSO4 decomposition and SO2 poisoning over V2O5-MoO3/TiO2-CeO2 catalyst 认领 引用 被引量：11
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作者 Chengqiang Zheng Teng Cheng +2 位作者 Linjun Yang Hao Wu Hongmei Fan 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2020年第5期279-291,共13页
The deposition of NH4 HSO4 and the poisoning effect of SO2 on SCR catalyst are the main obstacles that restrict the industrial application of CeO2-doped SCR catalysts.In this work,deposited NH4 HSO4 decomposition beha... The deposition of NH4 HSO4 and the poisoning effect of SO2 on SCR catalyst are the main obstacles that restrict the industrial application of CeO2-doped SCR catalysts.In this work,deposited NH4 HSO4 decomposition behavior and SO2 poisoning over V2 O5-MoO3/TiO2 catalysts modified with CeO2 and SiO2 were investigated.By the means of characterization analysis,it was found that the addition of SiO2 into VMo/Ti-Ce had an impact on the interaction existed between catalyst surface atoms and NH4 HSO4.Temperatureprogrammed methods and in situ diffused reflectance infrared Fourier transform spectroscopy(DRIFTS)experiments indicated that the doping of SiO2 promoted the decomposition of deposited NH4 HSO4 on VMo/Ti-Ce catalyst surface by reducing the thermal stability of NH4 HSO4 and enhancing the NH4 HSO4 reactivity with NO in low temperature.And this improvement may be the reason for the better catalytic activity than VMo/Ti-Ce in the case of NH4 HSO4 deposition.Accompanied with cerium sulfate species generated over catalyst surface,the conversion of SO2 to SO3 was inhibited in SiCe mixed catalyst.The addition of SiO2 could promote the decomposition of cerium sulfate,which may be a potential strategy to enhance the resistance of SO2 poisoning over CeO2-modifed catalysts. 展开更多
关键词 CeO2-doped SCR catalyst SiO2 addition NH4HSO4 decomposition SO2 poisoning Cerium sulfate
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MgO、MnO2复合助剂改性Ni基催化剂CO2甲烷化催化性能 认领 引用
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作者 张晓煜 张春磊 +3 位作者 徐则林 马吉亮 许芸 周凯 《低碳化学与化工》 CAS 北大核心 2026年第7期66-73,94,共8页
面对全球气候变化与能源转型的迫切需求,CO2甲烷化工艺能够将富余的电力与CO2转化为易于储存和运输的CH4,有利于构建未来低碳能源体系。然而,现有的Ni基催化剂存在活性组分分散性有限、催化活性不足等问题。采用分步浸渍-焙烧... 面对全球气候变化与能源转型的迫切需求,CO2甲烷化工艺能够将富余的电力与CO2转化为易于储存和运输的CH4,有利于构建未来低碳能源体系。然而,现有的Ni基催化剂存在活性组分分散性有限、催化活性不足等问题。采用分步浸渍-焙烧策略,通过引入MgO与MnO2作为复合助剂,对Ni基催化剂进行了协同改性,制备了一系列不同助剂种类与含量的催化剂。通过XRD、N2吸/脱附和CO2-TPD等方法对催化剂的结构和表面性质进行了表征,并通过固定床反应系统评价了其CO2甲烷化催化性能。结果表明,340℃时,在MgO与MnO2协同改性的5Mg2MnNiAl催化剂作用下,CO2转化率达92.12%,CH4选择性达99.02%。表征分析显示,MgO的引入丰富了催化剂的中强碱性位点,促进了CO2吸附与活化;MnO2则有效细化并均匀分散了Ni颗粒,增强了金属-载体相互作用。本研究将为CO2甲烷化催化剂制备及其工业化应用提供参考。 展开更多
关键词 CO2甲烷化 Ni基催化剂 MgO MnO2 金属-载体相互作用
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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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Catalytic decomposition of CH_4 over Ni-Al_2O_3-SiO_2 catalysts:Influence of pretreatment conditions for the production of H_2 认领 引用 被引量：2
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作者 Jangam Ashok Gangadhara Raju +2 位作者 Padigapati Shiva Reddy Machiraju Subrahmanyam Akula Venugopal 《Journal of Natural Gas Chemistry》 2008年第2期113-119,共7页
This article reports the production of COx free hydrogen and carbon nanofibers by the catalytic decomposition of methane over Ni-Al2O3-SiO2 catalysts. The influence of reaction temperature, pretreatment temperature, a... This article reports the production of COx free hydrogen and carbon nanofibers by the catalytic decomposition of methane over Ni-Al2O3-SiO2 catalysts. The influence of reaction temperature, pretreatment temperature, and effect of reductive pretreatment on the decomposition of methane activity is investigated. The physico-chemical characteristics of fresh and deactivated samples were characterized using BET-SA, XRD, TPR, SEM/TEM, CHNS analyses and correlated with the methane decomposition results obtained. The Ni-Al-Si （4 ： 0.5 ： 1.5） catalyst reduced with hydrazine hydrate produced better H2 yields of ca. 1815 mol H2/mol Ni than the catalyst reduced with 5% H2/N2. 展开更多
关键词 in situ reduction Ni-Al2O3-SiO2 catalyst methane decomposition hydrogen production carbon nanofibers
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乙醇溶剂体积对Ni-Fe/γ-Al2O3催化剂微波热解高密度聚乙烯制氢性能的影响 认领 引用
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作者 魏家荣 谢翔 +5 位作者 周志彬 雷丁懿 李嘉墀 卢林博 侯丽敏 张智羽 《塑料工业》 CAS CSCD 北大核心 2026年第6期159-166,共8页
微波热解因反应速率快、能效高,被认为是塑料废弃物资源化制氢的重要途径,其中催化剂制备工艺对制氢性能具有关键影响。以Ni-Fe/γ-Al2O3;为研究对象,系统考察乙醇体积(0、25、50、75mL)对催化剂结构及其在高密度聚乙烯(HDPE)微... 微波热解因反应速率快、能效高,被认为是塑料废弃物资源化制氢的重要途径,其中催化剂制备工艺对制氢性能具有关键影响。以Ni-Fe/γ-Al2O3;为研究对象,系统考察乙醇体积(0、25、50、75mL)对催化剂结构及其在高密度聚乙烯(HDPE)微波热解制氢过程中的性能影响。结果表明,不同体积的乙醇可调控活性组分在γ-Al2O3;载体上的分散状态及物相结构,显著影响催化剂制氢性能。当乙醇体积为25mL时,Ni、Fe活性组分分散均匀,形成稳定的FeAl2O3和NiFe2O4复合活性结构,HDPE热解的氢气产量、氢气效率及氢气体积分数分别达到49.7mmol/g、69.6%和82.7%。乙醇用量不足或过量均会导致活性组分分布不均或团聚脱落,从而削弱制氢性能。该研究表明,合理调控乙醇体积是优化Ni-Fe/γ-Al2O3,催化剂制备工艺、提升微波热解塑料制氢效率的有效途径。 展开更多
关键词 Ni-Fe/γ-Al2O3催化剂 乙醇溶剂 微波热解 高密度聚乙烯 制氢性能
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Selective Hydrogenation of Butyne-1,4-diol to Butane-1,4-diol over Ni/Al_2O_3-SiO_2 Catalysts 认领 引用 被引量：2
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作者 Fang Jie Zhuang Changjian +2 位作者 Meng Jipeng Cheng Lang Lu Jiangyin 《China Petroleum Processing & Petrochemical Technology》 CAS 2018年第4期20-28,共9页
Ni/Al_2O_3-SiO_2 catalysts were synthesized via one-step method employing SiO_2 as an additive for the selective hydrogenation of butyne-1,4-diol(B_3D) to butane-1,4-diol(B1D). The prepared catalysts were evaluated by... Ni/Al_2O_3-SiO_2 catalysts were synthesized via one-step method employing SiO_2 as an additive for the selective hydrogenation of butyne-1,4-diol(B_3D) to butane-1,4-diol(B1D). The prepared catalysts were evaluated by a series of characterization techniques including BET, XRD, SEM, EDX-mapping, TEM, H_2-TPR, XPS, NH_3-TPD and Py-FTIR. Compared to Ni/Al_2O_3 catalyst, the SiO_2-doped samples exhibited better B_3D conversion. SiO_2 could help to form a strong interaction between NiO with the support, which inhibited Ni agglomeration at high temperature, improved the Ni dispersion, and enhanced the hydrogenation activity. B_1D selectivity was mainly influenced by the quantity of Lewis acid sites in addition to the Ni dispersion. The catalyst with a silica loading of 6.4% demonstrated an excellent selectivity of 75.18%(by 13% higher than the contrastive Ni/Al_2O_3 catalyst), which was attributed to the larger amount of Lewis acid sites and the moderate interaction between NiO with the support, which could facilitate the nickel dispersion on a preferable surface area of 176.3 m^2/g of support. 展开更多
关键词 Ni/Al2O3-SiO2 catalysts butyne-1,4-diol butane-1,4-diol hydrogenation
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Characterization and catalytic performance of CeO2-Co/SiO2catalyst for Fischer-Tropsch synthesis using nitrogen-diluted synthesis gas over a laboratory scale fixed-bed reactor 认领 引用 被引量：2
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作者 Xiaoping Dai Changchun Yu 《Journal of Natural Gas Chemistry》 2008年第1期17-23,共7页
The surface species of CO hydrogenation on CeO2-Co/SiO2 catalyst were investigated using the techniques of temperature programmed reaction and transient response method.The results indicated that the formation of H2O ... The surface species of CO hydrogenation on CeO2-Co/SiO2 catalyst were investigated using the techniques of temperature programmed reaction and transient response method.The results indicated that the formation of H2O and CO2was the competitive reaction for the surface oxygen species,CH4 was produced via the hydrogenation of carbon species step by step,and C2 products were formed by the polymerization of surface-active carbon species(-CH2-).Hydrogen assisted the dissociation of CO.The hydrogenation of surface carbon species was the rate-limiting step in the hydrogenation of CO over CeO2-Co/SiO2 catalyst.The investigation of total pressure,gas hourly space velocity(GHSV),and product distribution using nitrogen-rich synthesis gas as feedstock over a laboratory scale fixed-bed reactor indicated that total pressure and GHSV had a significant effect on the catalytic performance of CeO2-Co/SiO2 catalyst.The removal of heat and control of the reaction temperature were extremely critical steps,which required lower GHSV and appropriate CO conversion to avoid the deactivation of the catalyst.The feedstock of nitrogen-rich synthesis gas was favorable to increase the conversion of CO,but there was a shift of product distribution toward the light hydrocarbon.The nitrogen-rich synthesis gas was feasible for F-T synthesis for the utilization of remote natural gas. 展开更多
关键词 CeO2-Co/SiO2 catalyst Fischer-Tropsch synthesis surface species reaction condition nitrogen-rich synthesis gas product distribution
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Insights on the effect of Si-Al interaction on Ni/Al2O3/SiC monolithic catalysts for CO2 methanation 认领 引用
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作者 Xiangli Liu Fei Gao +3 位作者 Jingyang Huang Yiqing Zeng Zhaoxiang Zhong Weihong Xing 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2025年第11期171-181,共11页
Monolithic catalysts have been widely investigated for CO2 methanation due to their fast mass and heat transfer rate,but the effect of the interaction between the catalyst layer and the monolithic support has been ... Monolithic catalysts have been widely investigated for CO2 methanation due to their fast mass and heat transfer rate,but the effect of the interaction between the catalyst layer and the monolithic support has been little studied.In this work,Ni/Al2O3/SiC monolithic catalysts,Ni/Al2O3 powder catalysts and Ni/Al2O3/SiC-M catalysts were prepared to explore the effect of Si-Al interaction between the catalyst layer and SiC ceramic for CO2 methanation performance.Ni/Al2O3/SiC exhibited a CO2 conversion of 53% and a CH4 specific reaction rate of 0.05 m mol·g-1·s-1 under conditions of 0.1 M Pa,4 00℃,and a WHSV of 60000 ml·g-1·h-1.The CO2 conversion raised by 0.15-fold and the CH4 specific reaction rate raised by 0.25-fold compared to Ni/Al2O3 with the same catalyst content.SEM,XRD,Raman,and other characterization results revealed that the formation of Si-Al interaction between the catalyst layer and SiC ceramic could weaken the interaction between Ni and Al2O3,thereby improving the catalytic activity of Ni/Al2O3/SiC catalyst.However,the Si-Al interaction was further strengthened during the hightemperature reaction process,which significantly weakened the interaction between Ni and Al2O3,thereby leading to a decline in the catalytic performance of Ni/Al2O3/SiC catalyst during an 80-h stability test.This study provides valuable insights for future research and development of monolithic catalysts. 展开更多
关键词 Carbon dioxide Hydrogenation Monolith Ni/Al2O3/SiC monolithic catalyst Si-Al interaction
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