担体对Fe-MnO催化剂上乙烯二次反应的影响  

EFFECT OF SUPPORT ON SECONDARY REACTIONS OF ETHYLENE OVER SUPPORTED Fe-MnO CATALYST

作　　者：徐龙伢[1] 王清遐[1] 蔡光宇[1] 陈国权[1] 黄家生[2] 徐奕德[2] 

机构地区：[1]中国科学院大连化学物理研究所,大连116023 [2]中国科学院催化基础国家重点实验室,大连116023

出　　处：《燃料化学学报》1993年第2期121-126,共6页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金;大连化学物理研究所青年基金

摘　　要：以乙烯为探针分子,采用TPSR手段研究催化剂担体对乙烯二次反应的影响。结果表明,担体的性质差异导致不同类型的乙烯二次反应,从而将直接影响到烯烃选择性。结合催化剂CO加氢反应结果及催化剂表面CO/H_2-TPSR、C_2H_4/H_2脉冲反应表征,发现担体的碱性促使乙烯歧化生成甲烷和丙烯,而担体的酸性促使乙烯歧化的同时,存在强烈的丙烯加氢作用,从而促进乙烯歧化,导致烯烃选择性大幅度下降,因而酸性担体不利于烯烃生成。TPSR technique was employed to investigate the effect of support on the secondary reaction of ethylene. From the results of CO hydrogenation and CO/H_2-TPSR characterization, it was found that differrent supports lead to different secondary reactions,and thus,affect the selectivity of light olefins. Catalyst PBC (based on basic support) causes the disproportionation of C_2H_4, giving methane and C_3H_6, so it had a higher selectivity to light olefins. Catalyst PAC (based on acidic support) catalyzes the hydrogenation of C_3H_6 to C_3H_3, and promotes further the disproportionation of C_2H_4 ; so it is undesirable for the production of light olefins.

关 键 词：乙烯 催化剂 

分 类 号：O623.121[理学—有机化学]