分子筛结构和酸性对正丁烯异构化反应的影响

利用XRD、SEM、NH3-PTD和吡啶吸附红外光谱等手段对ZSM-35和SAPO-11分子筛的结构和酸性质进行表征和对比，考察两种分子筛对正丁烯异构化制备异丁烯反应的催化性能。结果表明，对于硅铝型ZSM-35分子筛，由于存在较强的B酸中心，在异构化反应过程中，丁烯二聚及裂解等副反应发生多，异丁烯选择性低。而SAPO-11分子筛主要以中等偏弱的B酸中心为主，加上一维十元环孔道结构，在异构化反应中更有利于异丁烯的生成，表现出更高的异丁烯选择性及收率。

Influence of the structure and acidic properties of molecular sieves on n-butene skeletal isomerization

The structure and acidic properties of ZSM35 and SAPO11 molecular sieves were character ized by XRD, SEM, NH3TPD and FFIR of adsorbed pyridine. The catalytic properties of the two catalysts for the skeletal isomerization of 1butene were compared. The results showed that compared with SAPO11 molecular sieve, ZSM35 molecular sieve possessed higher activity and lower selectivity to isobutene in 1butene transformation due to the presence of strong B acid sites and the multiple side reaction which formed various byproducts through undesired consecutive reactions such as dimerization followed by cracking. The medium strong acid sites and onedimensional pores with a 10membered ringsystem were responsible for the high selectivity to and the yield of isobutene over SAPO11 molecular sieve.