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

作     者：Xue Ding Shan Geng Chunyi Li Chaohe Yang Guohui Wang 

作者机构：State Key Laboratory of Heavy Oil Processing China University of Petroleum （East China） Qingdao 266555 Shandong China Daqing Refining ＆ Chemical Company CNPC Daqing 163411 Heilongjiang China 

出 版 物：《Journal of Natural Gas Chemistry》 (天然气化学杂志（英文版）)

年 卷 期：2009年第18卷第2期

页      面：156-160页

核心收录：

学科分类：081702[工学-化学工艺] 081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070305[理学-高分子化学与物理] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

主　　题：ethylene oligomerization dry gas HZSM-5 mechanism 

摘      要：The oligomerization of ethylene in FCC dry gas over HZSM-5 catalyst with different Si/A12 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 0.14mmolNH3/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.