担体对Fe-MnO催化剂CO+H_2反应性能的影响  

EFFECT OF SUPPORT ON CATALYTIC PERFORMANCE OF Fe-MnO CATALYST FOR CO HYDROGENATION

作　　者：徐龙伢[1] 蔡光宇[1] 王清遐[1] 陈国权[1] 

机构地区：[1]中国科学院大连化学物理研究所,大连116023

出　　处：《燃料化学学报》1992年第3期252-258,共7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：考察氧化物担体对Fe-MnO催化剂反应性能影响的结果表明,担体的类型对Fe-MnO催化剂CO加氢反应性能影响很大,其低碳烯烃选择性相差悬殊,Al_2O_3、SiO_2和MgO担载的Fe-MnO催化剂都不利于低碳烯烃的生成,而TiO_2担载的Fe-MnO催化剂则具有较高的烯烃选择性和催化活性。从担体-金属相互作用本质的差异,研究了担体对金属活性组分化学状态的影响及催化活性相与F-T合成烯烃的关系,发现担体-金属间的电子效应有利于催化剂活性和选择性的提高,其它物理化学效应引起的相互作用则不利于改善催化剂性能;还表明Fe_(?)C是催化活性相,Fe^(2+)物种的存在不利于提高烯烃的选择性。The influences of oxide-support on catalytic performance of Fe-MnO catalyst were investigated. It was shown that supports had significant effect on the catalytic performance of the catalyst especially on the selectivity to light olefins. Alumina, SiO_2and MgO were unfavorable for the production of light olefins and only TiO_2 supported Fe-MnO catalyst had higher selectivity to light olefins and higher catalytic activity. The effect of support on the chemical state of metal active component as well as the relation between catalytic active phase and F-T reaction to light olefins were also studied in relation to the different nature of SMSI. It was found that the electronic effect of support on metal active component was favorable for the enhancement of catalytic activity and olefin selectivity,while other physico-chemical effects were unfavorable. It was also made clear that Fe_(2·2)C was the catalytic active phase and Fe^(2+)was not desirable for the yield of light olefins.

关 键 词：烯烃 担体 铁 催化剂 

分 类 号：O623.12[理学—有机化学]