氧化硅掺杂对硫酸化氧化锆酸性中心浓度和强度的提高  

Increase in Concentration and Strength of Acidic Catalytic Sites on Sulfated Zirconia by Doping with Silica

作　　者：S. Tajammul HUSSAIN Muhammad MAZHAR Sheraz GUL 

机构地区：[1]真纳大学化学系

出　　处：《催化学报》2007年第7期622-626,共5页

基　　金：巴基斯坦伊斯兰堡高等教育委员会(20-573/R&D/05/313) .

摘　　要：用氧化硅掺杂硫酸化氧化锆可以增强硫酸化氧化锆的酸性. 以413～453 K下甲醇液相脱水为模型反应考察了改进催化剂的性能. 结果表明,在掺杂和未掺杂氧化硅的硫酸化氧化锆催化剂上甲醇均相继脱水生成二甲醚和乙烯. 在掺杂了氧化硅的催化剂上还有一定量的丙烯生成,而未掺杂氧化硅的催化剂上则没有丙烯生成.Doping sulfated zirconia with silica increases the acidity of the sulfated zirconia. This modified catalyst was used for liquid-phase dehydration of methanol at 413 - 453 K as a model reaction. Methanol is sequentially dehydrated to dimethyl ether and ethylene over both sulfated zirconia and silica-doped sulfated zirconia in a single step. Also, significant amounts of propylene are formed by the silica-doped catalyst but not by the undoped catalyst. The data were discussed in relation to increased acid active sites after doping with silica, which electronically modified the catalyst surface.

关 键 词：硫酸化氧化锆 氧化硅 甲醇脱水 二甲醚 乙烯 丙烯 

分 类 号：O643.36[理学—物理化学]