检索结果-南通市图书馆

methanation of co/co_(2)for power to methane process:Fundamentals,status,and perspectives

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2023年第5期80卷 182-206,I0005页

作者： Jie Ren Hao Lou Nuo Xu Feng Zeng Gang Pei Zhandong Wang Department of Thermal Science and Energy Engineering University of Science and Technology of ChinaHefei 230026AnhuiChina National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029AnhuiChina State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816JiangsuChina

Power-to-methane(P2M)processes,by converting electricity from renewable energy to H2and then into other high value-added and energy-intense chemicals in the presence of active catalysts,have become an effective solution for energy storage.However,the fluctuating electricity from intermittent renewable energy leads to a dynamic composition of reactants for downstream methanation,which requires an excellent heterogeneous catalyst to withstand the harsh conditions.Based on these findings,the objective of this review is to classify the fundamentals and status of co/co_(2)methanation and identify the pathways in the presence of various catalysts for methane production.In addition,this review sheds insight into the future development and challenges of co_(2)or co methanation,including the deactivation mechanisms and catalyst performance under dynamically harsh conditions.Finally,we elaborated on the advantages and development prospects of P2M,and then we summarized the current stage and ongoing industrialization projects of P2M.

关键词： Power-to-methane co methanation co_(2)methanation Heterogeneous catalyst methanation mechanism

Phytic acid-derived fabrication of ultra-small MoP nanoparticles for efficient co methanation: Effects of P/Mo ratios

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2020年第8期29卷 248-255,I0009页

作者： Jun Zhao Zijia Yin Baowei Wang Zhenhua Li Yan Xu Xinbin Ma Key Laboratory for Green Chemical Technology of the Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China

Molybdenum phosphide(MoP) catalyst has been widely applied in hydrogenation reactions, while the preparation of unsupported MoP catalysts with ultra-small size and large specific surface area(SBET) is still challenging. Herein, we have provided a facile method for preparing a series of MoP-x(x=P/Mo ratios ranging from 1 to 5) catalysts by pyrolyzing phytic acid(PA)-derived Mo complexes in a H2 atmosphere. The physicochemical properties and the catalytic activity of MoP catalysts were investigated. The results showed that the obtained MoP-5 catalyst had the largest SBETand exhibited ultra-small nanoparticle diameter of 3.6 nm, which ascribed to the chelation of PA and the confinement of deposited products.As the content of PA increased, the synthetic mechanism of MoP was also affected, which led to the difference in the valence of surface Mo species. The characterization results further confirmed that Moδ+ sites in MoP catalysts are active sites for methanation reaction and its content on the surface of MoP-x catalysts determines the catalytic activity.

关键词： Molybdenum phosphide Phytic acid P/Mo ratios Ultra-small nanoparticle co methanation

Optimization of catalyst pellet structures and operation conditions for co methanation

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2021年第12期34卷 106-113页

作者： Yiquan Zhao Yao Shi Guanghua Ye Jing Zhang Xuezhi Duan Gang Qian Xinggui Zhou State Key Laboratory of Chemical Engineering School of Chemical EngineeringEast China University of Science and TechnologyShanghai 200237China

A fundamental understanding of the effects of catalyst pellet structures and operation conditions on catalytic performance is crucial for the reactions limited by diffusion mass transfer. In this work, a numerical investigation has been carried out to understand the effect of catalyst pellet shapes(sphere, cylinder, trilobe and tetralobe) on the reaction-diffusion behaviors of co methanation. The results reveal that the poly-lobe pellets with larger external specific surface area have shorter diffusion path, and thus result in higher effectiveness factors and co conversion rates in comparison with the spherical and cylindrical pellets. The effects of operating conditions and pore structures on the trilobular catalyst pellet with high performance are further probed. Though lower temperature can contribute to larger effectiveness factors of pellets, it also brings about lower reaction rates, and pressure has little impact on the effectiveness factors of the pellets. The increase in porosity can reduce the pellet internal diffusion limitations effectively and there exists an optimal porosity for the methanation reaction. Finally, the height of the trilobular pellet is optimized under the given geometric volume, and the results demonstrate that the higher the trilobular catalyst, the better the reaction performance within the allowable mechanical strength range.

关键词： co methanation Numerical simulation Catalyst pellet Shape effects Reaction-diffusion behavior

Ni/Al_2O_3 catalysts for co methanation: Effect of Al_2O_3 supports calcined at different temperatures

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2013年第6期22卷 919-927页

作者： Jiajian Gao Chunmiao Jia Jing Li Meiju Zhang Fangna Gu Guangwen Xu Ziyi Zhong Fabing Su State Key Laboratory of Multiphase complex Systems Institute of Process Engineering Chinese Academy of Sciences University of Chinese Academy of Sciences Institute of Chemical Engineering and Sciences A*star

The correlation between phase structures and surface acidity of Al2O3 supports calcined at different temperatures and the catalytic performance of Ni/Al2O3 catalysts in the production of synthetic natural gas(SNG) via co methanation was systematically investigated. A series of 10 wt% NiO/Al2O3 catalysts were prepared by the conventional impregnation method, and the phase structures and surface acidity of Al2O3 supports were adjusted by calcining the commercial γ-Al2O3 at different temperatures(600–1200 C). co methanation reaction was carried out in the temperature range of 300–600 C at different weight hourly space velocities(WHSV = 30000 and 120000 mL·g-1h-1) and pressures(0.1 and 3.0 MPa). It was found that high calcination temperature not only led to the growth in Ni particle size, but also weakened the interaction between Ni nanoparticles and Al2O3 supports due to the rapid decrease of the specific surface area and acidity of Al2O3 supports. Interestingly, Ni catalysts supported on Al2O3 calcined at 1200 C(Ni/Al2O3-1200) exhibited the best catalytic activity for co methanation under different reaction conditions. Lifetime reaction tests also indicated that Ni/Al2O3-1200 was the most active and stable catalyst compared with the other three catalysts, whose supports were calcined at lower temperatures(600, 800 and 1000 C). These findings would therefore be helpful to develop Ni/Al2O3 methanation catalyst for SNG production.

关键词： Ni catalyst alumina co methanation synthetic natural gas carbon deposition

Balancing free and confined metallic Ni for an active and stable catalyst——A case study of co methanation over Ni/Ni–Al2O3

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2020年第11期29卷 73-84页

作者： Yong-Shan Xiao Yong-Hong Song Chang Liu Xian-Ying Shi Han-Qing Ge Min-Li Zhu Zhao-Tie Liu Zhong-Wen Liu Key Laboratory of Syngas conversion of Shaanxi Province School of Chemistry&Chemical EngineeringShaanxi Normal UniversityXi'an 710119ShaanxiChina

We propose a new strategy to make an active and stable Ni-based catalyst which can be operated in a wide range of reaction temperatures. The ordered mesoporous alumina(OMA) with confined Ni in the pore wall(Ni-OMA) was prepared via the one-pot evaporation induced self-assembly method. By using the incipient impregnation method, different amounts of free Ni were loaded over Ni-OMA(Ni/NiOMA) at a fixed total NiO content of 15 wt%. Characterization results confirmed the formation of wellstructured Ni-OMA, and the ordered structure was still well preserved even after impregnating NiO at a content of as high as 12 wt%. The catalysts were evaluated for the co methanation as a model reaction under varied conditions. Importantly, the activity and stability of Ni/Ni-OMA for the titled reaction were significantly regulated by simply changing the ratio of the confined to free Ni. Over the optimum catalyst of NiO(2 wt%)/NiO(13 wt%)-OMA, the high activity at a temperature of as low as 300 ℃ was achieved with the space-time yield of methane over 7.6 g gcat-1 h-1 while a long-term stability for a time-onstream of 400 h was confirmed without an observable deactivation under the conditions of 600 ℃ and an extremely high gas hourly space velocity of 120,000 mL g-1 h-1. The results were well explained as the integrated merits of the free Ni for a high dispersion and the confined Ni in OMA for the anti-sintering property.

关键词： co methanation Ni Ordered mesoporous alumina Evaporation induced self-assembly Ni-support interactions

Preparation of highly dispersed supported Ni-Based catalysts and their catalytic performance in low temperature for co methanation

在线全文

学校读者我要写书评

暂无评论

Carbon Resources conversion 2020年第1期3卷 164-172页

作者： Yongbin Yao Jing Xu Xuhong Guo Jiangwei Li Qixia Zhang Jiangbing Li Chao Wang Mengjuan Zhang Bin Dai Feng Yu Sebastien Thomas Anne-Cecile Roger Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan School of Chemistry and Chemical EngineeringShihezi UniversityShihezi 832003PR China State Key Laboratory of Chemical Engineering East China University of Science and TechnologyShanghai 200237PR China Key Laboratory on Resources Chemicals and Materials of Ministry of Education Shenyang University of Chemical TechnologyShenyang 110142PR China Graduate School of Science and Technology Hirosaki University3 Bunkyo-choHirosakiAomori 036-8560Japan Institut de Chimie et Procedes pour l’Energie l’Environnement et la Sante(ICPEESUMR CNRS 7515)25 rue Becquerel67087 StrasbourgFrance

The use of non-noble nickel-based catalysts for low temperature co methanation has been a challenge in recent years.Herein,MgAl layered double oxides sample with high dispersion synthesized by a facile N-(2-Hydroxyethyl)ethylenediaminetriacetic acid assisted wetness impregnation approach,demonstrates much superior catalytic activity and exceptional stability for co methanation in comparison with the classical Ni/MgAl-LDO catalyst prepared by the ordinary wetness impregnation method.HRTEM results showed that N-(2-Hydroxyethyl)ethylenediaminetriacetic acid played a positive role in the dispersion of Ni,as well as Ni-support interaction.Well-dispersed Ni particles with a size of about 5 nm were formed in the presence of N-(2-Hydroxyethyl)ethylenediaminetriacetic acid.compared to the Ni/MgAl-LDO prepared by conventional impregnation method,the NH-Ni/MgAl-LDO exhibited superior catalytic performance,especially excellent thermal stability.The NH-Ni30/MgAl-LDO catalyst was found to keep a 70%co conversion even at 160◦C which demonstrates its good low temperature performance.From the in situ FTIR observations,this good performance at low temperatures may be linked to the delocalization of electrons around co caused by surface hydroxyl groups.

关键词： complexed-impregnation Layered double oxide co methanation Low temperature catalyst