文献类型：期刊文献

英文题名：Engineering a Nickel-Oxygen Vacancy Interface for Enhanced Dry Reforming of Methane: A Promoted Effect of CeO2 Introduction into Ni/MgO

作者：Ding, Xi[1,2];Yang, Yunfeng[1,2];Li, Zhaoyang[1,2];Huang, Peitao[2];Liu, Xiaohui[1,2];Guo, Yong[1,2];Wang, Yanqin[1,2]

机构：[1]East China Univ Sci & Technol, State Key Lab Green Chem Engn & Ind Catalysis, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China

年份：2023

卷号：13

期号：23

起止页码：15535

外文期刊名：ACS CATALYSIS

收录：;EI(收录号：20234915186401);WOS:【SCI-EXPANDED(收录号:WOS:001113320000001)】；

基金：This work was supported financially by the NSFC of China (Nos. 22072041 and 21832002), the National Key Research and Development Program of China (No. 2022YFA1504904), and the Science and Technology Commission of Shanghai Municipality (10dz2220500).

语种：英文

外文关键词：dry reforming of methane; CeO2-modified Ni/MgOcatalyst; oxygen vacancy; interfacial catalysis; mechanism

摘要：Nickel, the most commonly used active metal for the dry reforming of methane (DRM), often encounters the challenge of severe deactivation due to sintering and carbon deposition. In this study, we introduce cerium into Ni/MgO, a traditional catalyst for DRM, to improve its activity and stability, resulting in an enhanced Ni/MgCeOx catalyst. With the optimized doping amount of cerium (Ce/Mg = 0.12), the catalyst demonstrates a conversion rate 65% for CH4, 75% for CO2, and a H-2/CO ratio of 0.76, while the Ni/MgO catalyst only achieves a conversion rate of 57% for CH4, 65% for CO2, and a H-2/CO ratio of 0.68. Furthermore, the introduction of cerium significantly improves the stability of the catalyst. These improved activity and stability can be attributed to the easy reducibility of NiOx species, small Ni particle size, and abundant oxygen vacancies resulting from the doping of cerium. The affinity between CeO2 and NiOx inhibits the formation of the NiO-MgO solid solution, which contributes to the enhanced performance.