文献类型：期刊文献

英文题名：Effect of preparation condition on performance of Ag-MoO₃/ZrO₂ catalyst for direct epoxidation of propylene by molecular oxygen

作者：Jin, GJ; Lu, GZ; Guo, YL; Guo, Y; Wang, JS; Kong, WY; Liu, XH

机构：[1]E China Univ Sci & Technol, Lab Adv Mat, Res Inst Ind Catalysis, Shanghai 200237, Peoples R China

年份：2005

卷号：232

期号：1-2

起止页码：165

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

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000228203100024)】；

语种：英文

外文关键词：propylene; epoxidation; silver-molybdenum catalyst; zirconia support; preparation condition

摘要：The Ag-MoO3/ZrO2, catalyst for an epoxidation of propylene by molecular oxygen was prepared by the precipitation/impregnation method, and characterized by N-2 adsorption at low temperature, XRD, NH3-TPD and CO2-TPD. The effects of preparation condition of ZrO2 support on its physicochemical properties and catalytic performance were studied. The results show that suitably low surface area, big pore size, and modest and weak surface acidity-basicity for the Ag-MoO3/ZrO2 catalyst are in favor of the selective formation of propylene oxide. High surface area, abundant micro-pore structure and strong acidity-basicity or acidity-free are liable to the deep oxidation of propylene to CO2 and H2O. As the support of the Ag-MoO3 catalyst for an epoxidation of propylene, the monoclinic phase of ZrO2 is preferable to tetragonal one. Suitably larger particles of Ag and highly dispersed MoO3 on the Ag-MoO3/ZrO2 catalyst are beneficial to improve the selectivity to propylene oxide. (c) 2005 Elsevier B.V. All rights reserved.