Cu-Pd/MCM-22催化剂上二甲醚低温水解反应(英文)  

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

作　　者：方奕文[1] 宋一兵[2] 孙长勇[2] 王文进[2] 郭锐华[2] 林维明[1] 

机构地区：[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

出　　处：《催化学报》2006年第8期650-652,共3页

基　　金：SupportedbytheNationalNaturalScienceFoundationofChina(20576023)

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.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.

关 键 词：铜 钯 MCM-22 二甲醚 甲醇 低温水解 碳酸二甲酯 

分 类 号：O643.32[理学—物理化学]