多级孔SAPO-34分子筛的制备及在MTO反应中的应用研究进展  

Recent Advances in the Preparation of Hierarchical SAPO-34 Molecular Sieves and Their Applications in Methanol-to-Olefins (MTO) Reaction

作　　者：赵晨[1] 梁世航 王永睿[1] 慕旭宏[1] ZHAO Chen;LIANG Shihang;WANG Yongrui;MU Xuhong(Research Institute of Petroleum Processing,SINOPEC,Beijing 100083,China)

机构地区：[1]中国石化石油化工科学研究院

出　　处：《石油学报（石油加工）》2019年第5期1014-1024,共11页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：中国石油化工股份有限公司新结构分子筛合成和应用研究项目(117003)资助

摘　　要：综述了制备多级孔SAPO-34分子筛的后处理法和直接合成法等方法,对比了不同方法的优缺点,分析了多级孔SAPO-34分子筛催化甲醇制低碳烯烃(MTO)反应的性能及其如分子筛孔径、扩散速率、活性位点数量和酸性强弱等的影响因素。结果表明,多级孔SAPO-34分子筛催化MTO反应性能优异,甲醇转化率近100%、低碳烯烃(C 2=~C 4=)的选择性达90%左右。原因在于多级孔SAPO-34分子筛将介孔或(和)大孔引入分子筛晶粒中,克服了传统的微孔SAPO-34分子筛孔道尺寸小、易积炭失活的缺点,有效提高了反应物和产物的扩散效率,减少了反应积炭,延长了催化剂的寿命。Recent advances in the preparation of hierarchical SAPO-34 molecular sieves and their applications in MTO reaction are summarized in this review.Various strategies have been used to prepare hierarchical SAPO-34 zeolites by means of,for example,post-treatment method,soft-templating method,hard-templating method and other methods.These synthetic methods for the preparation of hierarchical SAPO-34,and their advantages and disadvantages are discussed in detail,and the influences of pore diameters,the diffusion,the catalytically active sites and acidity on the catalytic performance are also elucidated.SAPO-34 zeolites show outstanding performance in methanol-to-olefins(MTO)reaction with approximately 100%methanol conversion and the selectivity of ethylene and propylene reaching up to 90%,which is attributed to the mesopores or/and macropores introduced into microporous SAPO-34 zeolites,with the formation of hierarchical structure,which effectively decrease intracrystalline diffusion path length,overcome diffusion limitation,retard coke formation,and subsequently prolong the lifetime of catalyst.

关 键 词：多级孔 SAPO-34分子筛 甲醇制烯烃(MTO) 后处理法 直接合成法 

分 类 号：TE624[石油与天然气工程—油气加工工程]