催化学报

催化学报 ›› 2008, Vol. 29 ›› Issue (5): 415-417.

• 研究快讯 •    下一篇

Al助剂对超强酸WOx/ZrO2机械应力稳定性的改善

田戈1,2,徐云鹏1,徐竹生1,田志坚1,林励吾1   

  1. 1 中国科学院大连化学物理研究所, 辽宁大连 116023; 2 中国科学院研究生院, 北京 100049
  • 收稿日期:2008-05-25 出版日期:2008-05-25 发布日期:2012-05-02

Effect of Aluminum on the Mechanical Stress Stability of WOx/ZrO2 Superacid

TIAN Ge1,2, XU Yunpeng1, XU Zhusheng, TIAN Zhijian1*, LIN Liwu1   

  1. 1 Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian 116023, Liaoning, China; 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2008-05-25 Online:2008-05-25 Published:2012-05-02

PDF

804

被引次数

16

摘要： 载体ZrO2以四方相(t相)结构存在是WOx/ZrO2形成超强酸结构和高催化活性的必要条件. 研究表明,机械处理(研磨和压片)可导致WOx/ZrO2的载体发生四方相向单斜相的部分转变,从而降低Pt/WOx/ZrO2的正庚烷异构化活性. 添加Al助剂明显提高了载体四方相结构对机械应力的稳定性,从而维持了其催化活性.

关键词: 二氧化锆, 固体酸, 烷烃异构化, 机械应力

Abstract: Tetragonal structure of ZrO2 support is very important for WOx/ZrO2 catalysts to be highly active. In this study, it was found that mechanical stress treatments (grinding in a mortar or pressing under 50 MPa) resulted in a partial phase transformation of WOx/ZrO2 from tetragonal ZrO2 to monoclinic ZrO2 and also decreased the n-heptane isomerization activity of the Pt/WOx/ZrO2 catalyst. The addition of aluminum greatly improved the resistance of WOx/ZrO2 to mechanical stress and maintained its n-heptane isomerization activity.

Key words: zirconia, solid acid, alkane isomerization, mechanical stress