中文摘要：

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。

英文摘要：

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.