Effect of acid density of HZSM-5 on the oligomerization of ethylene in FCC dry gas

查看全文 作　　者：Xue [1]Ding;Shan [1]Geng;Chunyi [1]Li;Chaohe [1]Yang;Guohui [2]Wang

机构地区：[1]State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China), Qingdao 266555, Shandong, China;[2]Daqing Refining & Chemical Company, CNPC, Daqing 163411, Heilongjiang, China

出　　处：《Journal of Natural Gas Chemistry》索引2009年第18卷第2期,共5页

摘　　要：The oligomerization of ethylene in FCC dry gas over HZSM-5 catalyst with different Si/Al2 ratios was studied. The effect of acid density of catalyst on the oligomerization of ethylene was discussed. By increasing the acid density of catalyst, ethylene conversion showed a linear increase, while the yields of olefins decreased when the acid density of catalyst exceeded 0.14 mmolNH3/g owing to a promotion of hydrogen transfer reaction. Through comparing the average distance between acid sites on catalyst with kinetic diameters of olefins, it was found that the dimerization of ethylene was not restrained by the sparse distribution of acid sites, while the hydrogen transfer reaction of C3 and C4 olefins was limited. On these bases, a conclusion is proposed that the dimerization of ethylene proceeded via Eley-Rideal mechanism, while the hydrogen transfer reaction of C3 and C4 olefins followed the Langmuir-Hinshelwood mechanism. 关键词：催化裂化干气乙烯齐聚密度氢转移反应酸催化剂烯烃含量 C4烯烃稀疏分布

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Effect of acid density of HZSM-5 on the oligomerization of ethylene in FCC dry gas

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