Cu-Fe基催化剂上合成气直接制取低碳烯烃的研究

Catalytic Conversion of Syngas to Light Olefins over Cu-Fe based Catalyst

我们采用浸渍法制备了γ-Al2O3负载的Cu-Fe基催化剂,并结合其反应性能和XRD、H2-TPR和XPS等表征结果研究了其催化合成气直接制低碳烯烃的反应行为.结果表明,合成气直接制低碳烯烃Cu-Fe基催化剂的活性组分Cu和Fe之间存在明显的协同效应,Cu-Fe基催化剂表现出优异的合成气直接制低碳烯烃反应性能;Cu基催化剂中引入少量Fe组分明显提高了活性组分Cu的分散度,促进了Cu活性组分的还原,进而有利于催化剂反应性能的改进.初步推断Cu-Fe基催化剂上合成气转化生成低碳烯烃的主要反应历程为CO加氢生成含氧化合物(醇醚等)后再脱水生成低碳烯烃.

In this paper,a Cu-Fe based catalyst was prepared by impregnation method with γ-Al2O3 support. Combined with characterization of XRD,H2-TPR and XPS,catalytic behaviors of prepared Cu-Fe based catalysts for syngas to light olefins have been studied. The results show that Cu-Fe-Cat exhibits better reaction performance of syngas to olefins than Cu-Cat and Fe-Cat,which indicates that a synergistic effect between Cu and Fe exists in CuFe-Cat,and such synergistic effect between Cu and Fe in Cu-Fe-Cat largely promotes CO conversion. The reaction path of syngas to light olefins over Cu-Fe-Cat has also been discussed,and the main reaction path over Cu-Fe-Cat is proposed that syngas conversion to light olefins via oxygenates.