清洁法制备全结晶ZSM-5分子筛催化剂及其催化性能  

Preparation of holocrystalline ZSM-5 zeolite catalyst by clean method and its catalytic performance

作　　者：王达锐 孙洪敏 王一棪 刘威 杨为民 Wang Darui;Sun Hongmin;Wang Yiyan;Liu Wei;Yang Weimin(State Key Laboratory of Green Chemical Engineering and Industrial Catalysis,Sinopec Shanghai Research Institute of Petrochemical Technology Co.,Ltd.,Shanghai 201208,China)

机构地区：[1]中石化(上海)石油化工研究院有限公司,绿色化工与工业催化国家重点实验室,上海201208

出　　处：《工业催化》2024年第1期27-34,共8页Industrial Catalysis

基　　金：材料基因工程关键技术与支撑平台专项项目(2017YFB0702800);上海市科研计划专项经费(22YS1401100)。

摘　　要：在无额外添加碱金属或碱土金属的体系中,以氨水为模板剂,成功制备全结晶ZSM-5分子筛催化剂。晶化结束后,采用闪蒸技术回收晶化残液中的氨水,回收率高达85%,并且实现了回收氨水的循环再利用,连续回用3次仍然可以得到高结晶的分子筛催化剂。表征结果表明,通过优化合成配方,在晶化温度为170℃,晶化时间为6 h的条件下,制备的全结晶ZSM-5分子筛催化剂具有晶体形貌规整、晶间孔丰富、活性中心状态好、机械强度高(108 N·cm^(-1))等优点。在稀乙烯和苯气相烷基化制乙苯反应中,全结晶ZSM-5分子筛催化剂表现出优异的活性、选择性、稳定性及再生性能,关键杂质二甲苯含量仅为(350~400)μL·L^(-1),完全可以满足工业应用需求。Holocrystalline ZSM-5 zeolite catalyst was successfully prepared with ammonia as template in the system free of alkali metal or alkaline-earth metal addition.After crystallization,the residual ammonia in the crystallized mother liquor was recovered by flash evaporation technology,with a recovery efficiency up to 85%.The recycling of the recovered ammonia was further realized,and holocrystalline zeolite catalyst could be obtained after repeated recycling for three times.The characterization results indicate that by optimizing the synthesis formula,the holocrystalline ZSM-5 zeolite catalyst could be prepared under crystallization conditions of 170℃and 6 hour,with regular crystal morphology,abundant intercrystalline pore,perfect active center state and high mechanical strength(108 N·cm^(-1)).In the gas-phase alkylation of dilute ethylene and benzene to ethylbenzene,the holocrystalline ZSM-5 zeolite catalyst shows excellent activity,selectivity,stability and regeneration performance.And the content of xylene,the key impurity in the reaction product,is only(350-400)μL·L^(-1),fully meeting the industrial application requirements.

关 键 词：催化剂工程 清洁法 全结晶催化剂 ZSM-5分子筛 稀乙烯制乙苯 烷基化 

分 类 号：TQ426.6[化学工程] TQ424.25