催化学报

催化学报 ›› 2006, Vol. 27 ›› Issue (8): 650-652.

• 研究快讯 • 上一篇    下一篇

Cu-Pd/MCM-22催化剂上二甲醚低温水解反应

方奕文1,2,宋一兵2,孙长勇2,王文进2,郭锐华2,林维明1   

  1. 1 华南理工大学化工与能源学院, 广东广州 510641; 2 汕头大学化学系, 广东汕头 515063
  • 收稿日期:2006-08-25 出版日期:2006-08-25 发布日期:2010-09-28

Low-Temperature Hydrolysis of Dimethyl Ether over Cu-Pd/MCM-22 Catalyst

FANG Yiwen1,2, SONG Yibing2, SUN Changyong2, WANG Wenjin2, GUO Ruihua2, LIN Weiming1   

  1. FANG Yiwen1,2, SONG Yibing2, SUN Changyong2, WANG Wenjin2, GUO Ruihua2, LIN Weiming1
  • Received:2006-08-25 Online:2006-08-25 Published:2010-09-28

PDF

710

被引次数

29

摘要： 考察了分子筛的类型、硅铝比及Cu和Pd改性对分子筛催化剂上二甲醚低温水解活性的影响. 结果表明,酸性的MCM-22和HZSM-5分子筛催化剂具有较高的二甲醚水解活性,且其活性随着分子筛硅铝比的增加而降低. 这表明分子筛的类型及酸性对催化剂性能有重要影响,具有超笼结构的MCM-22分子筛上B酸中心的良好可接近性,使得该分子筛催化剂的水解活性较相同硅铝比的HZSM-5分子筛高. 与改性前相比, Cu和Pd改性后的MCM-22催化剂显示出更高的二甲醚水解活性.

关键词: 铜, 钯, MCM-22, 二甲醚, 甲醇, 低温水解, 碳酸二甲酯

Abstract: The catalytic performance of various zeolite catalysts for dimethyl ether (DME) hydrolysis was investigated. The aim is to obtain a highly active catalyst for hydrolysis of DME at low temperature, which can be coupled with the Cu-Pd/AC catalyst to construct a bifunctional catalyst for coupling the DME hydrolysis with methanol carbonylation. The results showed that the acidic zeolite catalysts HZSM-5 and MCM-22 exhibited DME hydrolysis activity at relatively low temperatures. Compared with HZSM-5, the good accessibility of the strong Bronsted acid sites located in MCM-22 super cages was responsible for higher conversion of DME. Further improvement in the catalytic activity was found on the MCM-22 catalyst modified by transition metals Pd and Cu.

Key words: copper, palladium, MCM-22, dimethyl ether, methanol, low-temperature hydrolysis, dimethyl carbonate