催化学报

催化学报 ›› 2007, Vol. 28 ›› Issue (7): 622-626.

• 研究论文 • 上一篇    下一篇

氧化硅掺杂对硫酸化氧化锆酸性中心浓度和强度的提高

S. Tajammul HUSSAIN, Muhammad MAZHAR, Sheraz GUL   

  1. 真纳大学化学系, 伊斯兰堡 45320, 巴基斯坦
  • 收稿日期:2007-07-25 出版日期:2007-07-25 发布日期:2011-07-25

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

S. Tajammul HUSSAIN, Muhammad MAZHAR, Sheraz GUL   

  1. Department of Chemistry, Quaid-i-Azam University, Islamabad 45320, Pakistan
  • Received:2007-07-25 Online:2007-07-25 Published:2011-07-25

PDF

948

被引次数

4

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.

关键词: 硫酸化氧化锆, 氧化硅, 甲醇脱水, 二甲醚, 乙烯, 丙烯

Abstract: 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.

Key words: sulfated zirconia, silica, methanol dehydration, dimethyl ether, ethylene, propylene