二甲醚在酸性分子筛上的低温水解

Low-Temperature Hydrolysis of Dimethyl Ether over Acidic Molecular Sieves

考察了几种酸性分子筛MCM-41、SAPO-34、ZSM-5和MCM-22上二甲醚的低温水解反应性能。结果发现,分子筛的种类和硅铝比均影响着催化剂上二甲醚水解反应的催化活性,其顺序为:MCM-41<<SAPO-34<HZSM-5(n(Si)/n(Al)=25)<HZSM-5(n(Si)/n(Al)=19)<HZSM-5(n(Si)/n(Al)=13)<MCM-22(n(Si)/n(Al)=13)。150℃时,MCM-22(n(Si)/n(Al)=13)催化水解反应的甲醇收率为9.69mmol.g-1.h-1,水的转化率为36.11%。

The activities of a series of acid zeolite, MCM-41, SAPO-34, ZSM-5 and MCM-22, for low-temperature hydrolysis of dimethyl ether （DME） were investigated. It wad found that the activities of the catalysts for DME hydrolysis to methanol were relative to their type and Si/Al ratio, and the sequence of activity was as follow ： MCM-41 〈 〈 SAPO-34 〈 HZSM-5 （n（Si）/n（Al） =25） 〈 HZSM-5（n（Si）/n（Al） =19） 〈 HZSM-5 （n （Si）/n（Al） =13） 〈 MCM-22 （n（Si）/n（Al） = 13）. Methanol space-time yield of 9.69 mmol. g^-1. h^-1, and water conversion of 36.11% were obtained at 150℃ for the MCM-22 （n（Si）/n（Al） = 13 ） catalyst.