摘要
系统回顾了甲醇制芳烃(MTA)的反应原理、MTA催化剂的活性组分(沸石与脱氢组分)、修饰组分、制备方法以及MTA催化剂反应-失活研究等方面的研究进展。甲醇可通过氢转移与脱氢环化两种途径转化为芳烃,后一途径可获得更高的芳烃选择性。负载具有脱氢功能的Zn组分、低硅铝比的ZSM-5基催化剂为性能优异的MTA催化剂。La、P及Si等组分的修饰可改善MTA催化剂的水热稳定性、提高其芳烃选择性或对二甲苯(PX)选择性。积炭、脱氢组分聚集、还原及分子筛骨架脱Al(或Ga)是导致MTA催化剂失活的重要因素。最后指出,改善催化剂水热稳定性、提高芳烃收率与高附加值芳烃产品的选择性及实现制备过程的绿色化是未来MTA催化剂开发的重要方向。
The research and development advance in the reaction mechanism of methanol to aromatics（MTA）,the influence of active components（zeolite,dehydrogenation component）,modifiers,the preparation methods and deactivity of the MTA catalyst for both the reaction and regeneration processes, is reviewed in this paper. Methanol is conversed to aromatics by two approaches,hydrogen shift and dehydrogenation-cyclization,and the latter could have high aromatic selectivity. The bi-functional catalysts consisted of ZSM-5 zeolite with low Si/Al ratio and dehydrogenation Zn component,exhibit excellent performance in MTA process. Modification of the MTA catalysts with La,P and Si components could improve their hydrothermal stability and selectivity to aromatics or p-xylene（PX）. The deactivation of MTA catalysts during the reaction and regeneration processes mainly results from carbon deposition,aggregation and reduction of the dehydrogenation components and hydrothermal removal Al or Ga from the molecular sieve framework. In future,the research and development of the MTA catalysts should be directed to improving hydrothermal stability,increasing the selectivity for high added-value aromatics and developing green preparation process for the catalysts.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2016年第5期1433-1439,共7页
Chemical Industry and Engineering Progress
关键词
甲醇
芳烃
分子筛
脱氢组分
失活
methanol
aromatics
molecular sieve
dehydrogenation component
deactivation
