文献类型：会议论文

英文题名：WO₃ microcrystallites: One of the crucial factors controlling the isomerization activity of Pt/WO₃-ZrO₂

作者：Song, Yueqin[1];Zhang, Juanjuan[1];Zhou, Xiaolong[1];Wang, Jin-An[2];Xu, Longya[3];Yu, Guoxian[4]

机构：[1]E China Univ Sci & Technol, Petr Proc Res Ctr, Shanghai 200237, Peoples R China;[2]Inst Politecn Nacl, ESIQIE, Lab Catalisis & Mat, Mexico City 07738, DF, Mexico;[3]Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Liaoning, Peoples R China;[4]Jianghan Univ, Sch Chem & Environm Engn, Wuhan 430056, Hubei Province, Peoples R China

会议论文集：2nd International Symposium on New Catalytic Materials

会议日期：AUG 16-20, 2009

会议地点：Cancun, MEXICO

语种：英文

外文关键词：Hydrothermal; Hydrous zirconia; Platinum; Tungstated zirconia; n-Hexane; Isomerization

摘要：A series of hydrous zirconia supports were prepared by hydrothermal method and Pt/WO3-ZrO2 catalysts were prepared by impregnation method. The catalytic activity of Pt/WO3-ZrO2 in n-hexane isomerization was evaluated in a fixed-bed reactor. In order to investigate the crystalline structure, acidity, and textural properties, the catalysts were characterized by XRD and Raman spectroscopy, NH3-TPD, FTIR, and N-2 adsorption. The results indicated that the crystalline structure of hydrous zirconia support and the state of tungsten oxide species over the catalyst varied obviously with the hydrothermal temperature, while no distinct change in the acidity of the catalyst occurred. The isomerization activity of Pt/WO3-ZrO2 could not well be correlated with the crystalline structure of hydrous zirconia support and the acidity. It was proposed that the presence of considerable microcrystalline WO3 in catalyst was indispensable for achieving high isomerization activity. (C) 2010 Elsevier B. V. All rights reserved.