三种不同拓扑结构的分子筛在甲醇制烯烃反应中的性能对比  

Comparative Study of Three Zeolites with Different Topologies(SAPO-34,Al-ITQ-13 and ZSM-5) in MTO Reaction

作　　者：王宝杰 赵红娟 王久江 杨周侠 滕秋霞 曾鹏晖[2] WANG Bao-jie;ZHAO Hong-juan;WANG Jiu-jiang;YANG Zhou-xia;TENG Qiu-xia;ZENG Peng-hui(Lanzhou Petrochemical Research Center,PetroChina,Lanzhou 730060,China;State Key Laboratory of Heavy Oil Processing,China University of Petroleum (Beijing),Beijing 102249,China)

机构地区：[1]中国石油兰州化工研究中心,甘肃兰州730060 [2]中国石油大学(北京)重质油加工国家重点实验室,北京102249

出　　处：《分子催化》2018年第6期493-500,I0001,共9页Journal of Molecular Catalysis(China)

基　　金：国家自然科学基金(Nos.U1462202)资助~~

摘　　要：采用XRD、SEM、N2吸附-脱附、NH3-TPD研究了3种不同拓扑结构的分子筛SAPO-34、Al-ITQ-13和ZSM-5分子筛的孔结构、酸性分布对其甲醇制低碳烯烃中反应性能的影响.结果表明,SAPO-34对乙烯具有最好选择性,可达52.3%; ZSM-5和Al-ITQ-13则对丙烯具有良好的选择性可达50.3%和50.0%,丙烯选择性相当,但兼顾乙烯时,Al-ITQ-13较ZSM-5高,可达18.4%. 3种分子筛反应性能的差异主要是其拓扑结构的不同引起的.孔道结构越小则越有利于小分子产物的生成,具有八元环结构的SAPO-34分子筛对小分子乙烯具有最高的选择性,而同时具有九元环和十元环结构的Al-ITQ-13由于孔道中含有一套九元环结构,使其与ZSM-5分子筛相比,在丙烯选择性相当的情况下,小分子产物乙烯明显增加.Three zeolites with different topologies, SAPO-34, Al-ITQ-13 and ZSM-5, were comparatively studied in methanol to olefins (MTO). The results showed that SAPO-34 presented the highest selectivity for ethylene, up to 52.3%, while ZSM-5 and Al-ITQ-13 showed higher selectivity for propylene, up to 50.3% and 50.0% respectively. But taking consideration of ethylene, Al-ITQ-13 had higher selectivity than ZSM-5, more than 10.7%. The dissimilarity in MTO performances was mainly due to the differences of their topologies. The smaller pore structure of zeolite was more favorable for the product with smaller size. SAPO-34 with 8-membered ring topology had smallest pore structure and its ethylene selectivity was the highest among the three zeolites. Al-ITQ-13 had one set of interconnecting channel of 9-membered ring, compared to ZSM-5, and it had higher selectivity for ethylene as well as similar selectivity for propylene.

关 键 词：SAPO-34 ZSM-5 Al-ITQ-13 MTO 拓扑结构 

分 类 号：O643.32[理学—物理化学]