不同分子筛上1-己烯骨架异构化反应性能的研究

以HZSM-35、HZSM-5、HM和Hβ四种分子筛为1-己烯骨架异构化催化剂，比较研究了四种催化剂的异构化性能，对其构效关系进行了关联。结果表明，相比于HZSM-5和Hβ分子筛，HZSM-35和HM具有适宜的酸量，有效孔径为0.4-0.6 nm，而且无晶穴、无交叉孔道，具有良好的择形催化效应，在转化率高达95%的同时，C_5-和C₇₊等副产物的收率在20%左右，异己烯收率可达40%-50%。进一步对四种分子筛进行酸碱改性处理，结果显示，虽然酸性质略有改变，但是一维孔结构的HZSM-35和HM分子筛的异构化性能仍明显优于多维孔结构的HZSM-5和Hβ分子筛，说明在酸性质一定的前提下，孔结构对异构化反应起关键作用。

A comparison of different zeolites in their catalytic performance in the skeletal isomerization of 1-hexene

HZSM-35, HZSM-5, HM and Hβ zeolites were used as the catalysts for the skeletal isomerization of 1-hexene; the relationship between their catalytic performance and physicochemical properties was investigated. The results show that in comparison with HZSM-5 and Hβ, HZSM-35 and HM are provided with suitable acid amount and effective pore size between 0.4-0.6 nm, without bug hole and cross channel; as a result, the later two zeolites exhibit better shape selectivity. With a high conversion of 1-hexene (> 95%), the by-products such as C_5- and C₇₊ in the products are about 20% and the yield of iso-hexene reaches 40%-50%. After the acid-base modification treatment, a slight change in the acidity is observed; however, the catalytic performance of one-dimensional HZSM-35 and HM zeolites in pore isomerization is still much better than that of HZSM-5 and Hβ zeolites with multidimensional pore structure, suggesting that the pore structure plays a key role in the isomerization reaction.