文献类型：期刊文献

英文题名：Effect of micropores on the structure and CO2 methanation performance of supported Ni/SiO2 catalyst

作者：Shen, Liang[1];Zhu, Minghui[1];Xu, Jing[1]

机构：[1]East China Univ Sci & Technol, Shanghai, Peoples R China

年份：2021

卷号：11

期号：6

起止页码：1213

外文期刊名：GREENHOUSE GASES-SCIENCE AND TECHNOLOGY

收录：;EI(收录号：20213710899622);WOS:【SCI-EXPANDED(收录号:WOS:000695630700001)】；

基金：This work is sponsored by the National Key R&D Program of China (2018YFB0604501), National Natural Science Foundation of China (22078089), Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning and Shanghai Sailing Program (19YF1410600).

语种：英文

外文关键词：catalyst; carbon dioxide; methanation; micropore; silica

摘要：Two types of SiO2 with different microporosities were evaluated as supports for the Ni/SiO2 catalysts. The CO2 methanation performance of the catalysts was evaluated, and the structure-activity relationship was elucidated with thorough characterizations. For the Ni/SiO2 catalyst with plenty of micropores, both ultrasmall Ni nanoclusters and larger Ni nanoparticles are present. In contrast, the one with fewer micropores only contains large Ni nanoparticles. During the CO2 methanation reaction, CO2 can be activated to CO on small Ni nanoclusters and further converted to CH4 on larger Ni nanoparticles. Such a tandem catalysis behavior greatly improves the CO2 methanation activity. The CH4 yield reaches 33.5 mu mol center dot g(-1)center dot s(-1) at 450 degrees C under 0.1 MPa with a feed H-2/CO2 mol ratio of 4:1 and a space velocity of 30 L center dot h(-1)center dot g(-1). (c) 2021 Society of Chemical Industry and John Wiley & Sons, Ltd.