Ni-HZSM-5分子筛用于不同烯烃原料齐聚反应性能的研究

Study on performance of Ni-HZSM-5 molecular sieve in catalyzing oligomerization of different olefins feedstocks

通过浸渍法制备了Ni-HZSM-5催化剂。利用XRD、SEM、N2物理吸附、NH3-TPD和Py-IR对催化剂进行表征,分别用丙烯、丁烯、2种比例丙烯丁烯的混烯、C3~C7多种混合烯烃等原料考察了催化剂烯烃齐聚反应的性能。结果表明,NiSO4处理可以增加催化剂的酸度和介孔体积,其中Lewis和Bronsted酸性位点的数量和强度明显增加。Ni-HZSM-5分子筛催化剂在多种烯烃原料下均表现出优异的催化性能。不同烯烃原料下的齐聚反应转化率均在75%以上,选择性均在80%以上,产物碳数分布主要集中在C6~C16之间。

Ni-HZSM-5 catalyst is prepared through impregnation method.XRD,SEM,N 2 physical adsorption,NH 3-TPD and Py-IR are used to characterize the prepared catalyst.The performance of the catalyst is evaluated in oligomerizations of propylene,butylene,mixtures of propylene and butylene,and C 3-C 7 mixed olefins,respectively.The results show that the acidity and mesopore volume of the catalyst can be increased by adding NiSO 4,in which the number and strength of Lewis and Brnsted acid sites in the catalyst go up significantly.Ni-HZSM-5 molecular sieve catalyst exhibits excellent catalytic performance against various olefin raw materials.The conversion rates of the oligomerization reaction under different olefin feedstocks all exceed 75%,the selectivity is above 80% and the carbon number of the products distributes mainly between C6-C16.