后处理调控丝光沸石性质及其对二甲醚羰基化反应影响的研究

Regulation of HMOR properties and its effect on DME carbonylation by post-treatment

采用四乙基氢氧化铵后处理对丝光沸石分子筛酸性质进行选择性调控,考察四乙基氢氧化铵水溶液浓度、温度对其物化性质和二甲醚羰基化性能的影响。结果表明,通过改变四乙基氢氧化铵后处理条件能在不影响分子筛晶体形貌、孔结构的前提下,定向提高Brongted酸酸中心在丝光沸石分子筛不同孔道中的分布;其中后处理温度影响较大。在二甲醚羰基化反应中,母体分子筛上二甲醚转化率为22%时,改性分子筛上的二甲醚转化率超过98%。为高性能二甲醚羰基化催化剂的设计制备提供了一种有效策略。

The effects of the concentration of tetraethylammonium hydroxide(TEAOH)solution and temperature on the physicochemical properties and DME carbonylation performance of MOR were investigated.The results show that the acid site distribution of MOR can be regulated selectively by changing the treatment conditions,and enhanced performance of DME carbonylation can be obtained consequently.Beyond 98%DME conversion can be obtained for the HMOR zeolite prepared using the optimal modification conditions whereas that of the original zeolite is only 22%under the same reaction conditions.This work provides an effective strategy for the design and preparation of a high-performance DME carbonylation catalyst.