文献类型：期刊文献

英文题名：A comparative investigation of SO2 oxidative transfer over CuO with a CeO2 surface

作者：Liu, Yifeng[1];Shen, Benxian[1];Pi, Zhipeng[1];Chen, Hua[1];Zhao, Jigang[1]

机构：[1]East China Univ Sci & Technol, Res Inst Petr Proc, Shanghai 200237, Peoples R China

年份：2017

卷号：402

起止页码：261

外文期刊名：APPLIED SURFACE SCIENCE

收录：;EI(收录号：20170403271825);WOS:【SCI-EXPANDED(收录号:WOS:000395213900034)】；

语种：英文

外文关键词：FCC sulfur transfer agent; Mars-van Krevelen cycle; Molecular simulation; Rate-control step

摘要：To further improve the catalytic desulfurization function of the Mg-Al spinel sulfur transfer agent in a fluid catalytic cracking (FCC) unit, the reaction paths of SO2 oxidation by O-2 over the metal oxide surface of CuO (111) and CeO2 (111) were investigated. In reference to the fact that SO2 reacting with O-2 over CuO was a Mars-van Krevelen cycle, a similar reaction law for SO2 oxidation over CeO2 was also verified by characterization methods (e.g., IR, XPS). Meanwhile, the molecular simulation results indicated that the rate-control step of SO2 oxidation over CeO2 (111) and CuO (111) was a SO3 desorption step. The lower energy barrier in the rate-control step corresponded to better catalytic performance; hence, it could explain the reason that CeO2 had a better sulfur oxidization transfer performance than CuO. (C) 2017 Elsevier B.V. All rights reserved.