文献类型：期刊文献

英文题名：Roles of cerium oxide and the reducibility and recoverability of the surface oxygen species in the CeO₂/MgAl₂O₄ catalysts

作者：Wang, J; Chen, L; Li, C

机构：[1]Natl Autonomous Univ Mexico, Inst Phys, Mexico City 01000, DF, Mexico;[2]E China Univ Sci & Technol, Petr Proc Res Ctr, Shanghai 200237, Peoples R China

年份：1999

卷号：139

期号：2-3

起止页码：315

外文期刊名：JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000078361700022)】；

语种：英文

外文关键词：sulfur-transfer catalyst; cerium oxide; magnesium-alumina spinel; surface oxygen; temperature-programmed reduction; De-SO2

摘要：The properties of surface oxygen species in the MgAl2O4 and CeO2/MgAl2O4 catalysts were investigated by the temperature-programmed reduction (TPR) technique. Three different oxygen species existing on the surface of CeO2/MgAl2O4 catalysts-surface adsorbed oxygen, surface lattice oxygen which was affected by the interaction between the supported cerium and carrier, and the oxygen species corresponding to the multilayer crystalline of CeO2, were determined. The supported cerium oxide had different functions: it not only increased the amount of surface adsorbed oxygen, but also reduced the reduction temperature of surface lattice oxygen and improved the recoverability of the surface oxygen species. These roles of cerium oxide in the CeO2/MgAl2O4 catalyst significantly affected on the SO2 adsorption properties, in the both cases of gaseous oxygen absence and presence in the reaction stream, enhancing the De-SO2 activity. (C) 1999 Elsevier Science B.V. All rights reserved.