Fe改性HZSM-5分子筛上甲醇耦合C_4烃制低碳烯烃反应性能研究  

Coupling of methanol and C4-hydrocarbons to light olefins over Fe-modified HZSM-5 zeolites

作　　者：王振伍[1] 姜桂元[1] 赵震[1] 周新宇[1] 段爱军[1] 刘坚[1] 徐春明[1] 高金森[1] 

机构地区：[1]中国石油大学重质油国家重点实验室,北京102249

出　　处：《工业催化》2008年第10期147-150,共4页Industrial Catalysis

基　　金：中国石油科技风险创新基金项目(07-06D-01-04-04-04);教育部重大项目(307008);中国石油大学重质油国家重点实验室开放课题资助项目(2007-04)

摘　　要：用等体积浸渍法制备Fe改性HZSM-5分子筛催化剂(Fe/HZSM-5)。考察了Fe/HZSM-5在不同温度下对甲醇耦合C4烃制低碳烯烃反应性能的影响,并利用紫外-可见漫反射光谱对Fe/HZSM-5进行了表征。结果表明,在低铁含量条件下,Fe改性HZSM-5分子筛上Fe(Ⅲ)主要以高分散隔离的形式存在于HZSM-5分子筛的表面,Fe改性提高了催化剂上的原料转化率以及乙烯和丙烯选择性,从而获得了较高的乙烯和丙烯总收率。在反应温度为550℃时,在Fe(Ⅲ)处理的HZSM-5分子筛上,乙烯和丙烯总收率最高可达42.1%,比未改性的HZSM-5提高了7%。Fe-modified HZSM-5 zeolites （Fe/HZSM-5）were prepared by incipient-wetness impregnation method and their behaviors for coupling of methanol and C4-hydrocarbons to light olefins were investigated at different temperature. The Fe/HZSM-5 zeolites were characterized by UV-Vis DRS. The results indicated that, at lower Fe loadings, Fe ions mainly existed in highly dispersed and isolated state on surface of the HZSM-5 zeolites. Modification with appropriate amount of Fe enhanced the selectivity to light olefins and yield of ethylene and propylene. Maximum yield of ethylene and propylene of 42.1% was obtained at 550 ℃, 7 percentage points higher than that over HZSM-5.

关 键 词：催化化学 甲醇 C4烃类 耦合 低碳烯烃 HZSM-5分子筛 

分 类 号：O643.36[理学—物理化学] TQ424.25[理学—化学]