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A fluidized-bed model for NiMgW-catalyzed co2 methanation

Particuology 2020年第2期18卷 55-64页

作者： Chunmiao Jia Yihu Dai Yanhui Yang Jia Wei Chew School of Chemical and Biomedical Engineering Nanyang Technological UniversitySingapore 637459Singapore Institute of Advanced Synthesis Nanjing Tech UniversityNanjing 211800Jiangsu ProvinceChina Singapore Membrane Technology Center Nanyang Technological UniversitySingapore 637141Singapore

The reduction of carbon dioxide to methane by hydrogen("co2 methanation")using renewable energy is a promising process for recycling *** catalysts and better reactors are both required for the practical application of co2 *** study examines how the operating parameters affect co2 methanation in a highly efficient fluidized-bed *** first measured the kinetics of the co2 methanation reaction using an NiMgW catalyst,which has been reported to exhibit superior catalytic *** then developed a fluidized-bed reactor model based on an earlier model for co2 *** fluidized bed model indicated that the NiMgW was indeed superior to two other previously studied catalysts in terms of faster conversion of reactants and higher concentrations of product CH4 throughout the *** overall rate of production of CH4 increased with temperature and H2/co2 ratio and decreased as the inlet reactant flow rate,catalyst particle diameter,and catalyst particle sphericity increased.

关键词： Fluidized-bed reactor model co2 methanation NiMgW catalyst Reaction kinetics Sensitivity analysis

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Reaction Scheme of Low-Temperature co2 methanation over Rh/TiO2 Catalyst

Reaction Scheme of Low-Temperature CO2 Methanation over Rh/T...

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中国化学会·第一届全国二氧化碳资源化利用学术会议

作者： Yingju Yang Jing Liu Feng Liu Jinchuan Zhang State Key Laboratory of coal combustion School of Energy and Power Engineering Huazhong University of Science and Technology

Rh/TiO has been regarded as a very promising catalyst for the low-temperature co methanation. However, the atomic-level reaction mechanism that dictates the reactivity and selectivity of co reduction over Rh/TiO catalyst remains elusive. The reaction mechanism governed by a delicate interplay of surface reaction chemistry and thermodynamics was systematically investigated using density functional theory. Theoretical results indicate that significant charges accumulate at the perimeter of the interface between support TiO and Rh nanoparticle. Metal-support interface is identified as the most active site for co adsorption and activation over Rh/TiO catalyst. compared with the direct C-O bond cleavage pathway and formate pathway, reverse water-gas shift(RWGS) reaction followed by co hydrogenation is much more thermodynamically and kinetically favorable for co methanation over Rh/TiO catalyst. The RWGS+co hydrogenation pathway via HcoH dissociation dominates co methanation due to the relatively lower energy barrier. H-mediated HOco dissociation is identified as the rate-limiting step of co methanation over Rh/TiO catalyst. These mechanistic insights can guide the rational design of catalyst active centers to boost the activity and selectivity of co reduction.

关键词： co2 methanation Rh/TiO2 catalyst Rate-limiting step Density functional theory

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Unique catalysis of Ni-Al hydrotalcite derived catalyst in co_2 methanation: cooperative effect between Ni nanoparticles and a basic support

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Journal of Energy Chemistry 2014年第5期23卷 587-592页

作者： Lei He Qingquan Lin Yu Liu Yanqiang Huang State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of Sciences

Ni-Al hydrotalcite derived catalyst （Ni-Al2O3-HT） exhibited a narrow Ni particle-size distribution with an average particle size of 4.0 nm. methanation of co2 over this catalyst initiated at 225℃ and reached 82.5% co2 conversion with 99.5% CH4 selectivity at 350℃, which was much better than its impregnated counterpart. Characterizations by means of co2 microcalorimetry and 27 Al NMR indicated that large amount of strong basic sites existed on Ni-Al2O3-HT, originated from the formation of Ni-O-Al structure. The existence of strong basic sites facilitated the activation of co2 and consequently promoted the activity. The combination of highly dispersed Ni with strong basic support led to its unique and high efficiency for this reaction. Keywords

关键词： co2 methanation hydrotalcite NiJA1203 basic support Ni-O-Al

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Three-dimensionally ordered macroporous perovskite materials for environmental applications

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Chinese Journal of Catalysis 2019年第9期40卷 1324-1338页

作者： Chenxi Zhang Peiyuan Zhao Shuangxi Liu Kai Yu Institute of New Catalytic Materials Science School of Materials Science and EngineeringNational Institute of Advanced MaterialsNankai UniversityTianjin 300350China MOE Key Laboratory of Pollution Processes and Environmental Criteria and Tianjin Key Laboratory of Environmental Technology for complex Transmedia Pollution College of Environmental Science and EngineeringNankai UniversityTianjin 300350China Department of Chemistry University of New HampshireDurhamNew Hampshire 03824USA MOE Key Laboratory of Advanced Energy Materials Chemistry Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)Tianjin 300072China

Three-dimensionally ordered macroporous(3DOM)perovskite materials have attracted the interest from researchers worldwide due to their unique macroporous structure,flexible composition,tailorable physicochemical property,high stability and *** particular,they were widely used in environmental field,such as photocatalysis,catalytic combustion,catalytic oxidation and *** this review,the recent progresses in the synthesis of 3DOM perovskite materials and their environmental applications are *** advantages and the promoting mechanisms of 3DOM perovskite materials for different applications are discussed in ***,the challenges and perspectives on the topic are proposed.

关键词： 3DOM material Perovskite Environmental application Photocatalysis Catalytic oxidation co2 methanation Sensor

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Role of support in photothermal carbon dioxide hydrogenation catalysed by Ni/CexTiyO2

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Progress in Natural Science:Materials International 2018年第2期28卷 168-177页

作者： Salina Jantarang Emma C.Lovell Tze Hao Tan Jason Scott Rose Amal Particles and Catalysis Research Group School of Chemical Sciences and Engineering The University of New South Wales

Nickel was supported on varied ratios of ceria-titania mixed oxides（Ni/CexTiyO2） to evaluate the role the support plays in photothermal carbon dioxide hydrogenation to produce methane. In a batch photothermal reactor system, Ni/CeO2achieved the highest conversion rate, reaching a conversion of 93% in approximately60–90 min. To decouple the influence of light and heat, the co2hydrogenation was examined in an in-house designed photothermal reactor, whereby heat can be applied externally. Decoupling experiments revealed that heat from the thermalisation by light was the main driving force for the reaction. In addition, the conversion and temperature profile of the different catalysts revealed that the catalyst performance was governed by catalyst reducibility. H2-TPR analyses showed that the Ni became more readily reducible with increasing Ce O2content,suggesting that the oxide plays a role in activating the Ni. The reduction temperature of the nickel catalyst（following a reduction and passivation process） was below 200 °C, which meant that the inherent heating temperature of the photothermal reactor was sufficient to initiate Ni/CexTiyO2catalyst activity. The exothermic methanation reaction was then able to heat the system further, ultimately reaching a temperature of 285 °C. The ancillary rise in temperature promotes further nickel reduction and methane formation, leading to a "snow-ball"effect. The findings demonstrate that, to achieve a "snow-ball" effect in a photothermal system, designing a catalyst which is easy to reduce, active for co2hydrogenation, and capable of converting light to heat for its initial activation is critical.

关键词： Photothermal co2 methanation Ceria Titania Nickel Reducibility

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