负载Fe_2O_3的Zr基钙钛矿催化剂对逆水煤气反应的影响

Preparation of Zr-based perovskite supported Fe_2O_3 catalyst and its performance in the reverse water gas shift reaction

采用固相反应法制备了钙钛矿结构的BaZr_(0.9)Y_(0.1)O_3,并用BaZr_(0.9)Y_(0.1)O_3作为载体负载Fe_2O_3,通过X射线衍射分析(XRD)、扫描电子显微镜(SEM)观察负载型催化剂的晶相结构和微观形貌,同时考察了制备的催化剂的逆水煤气反应催化活性。结果表明,BaZr_(0.9)Y_(0.1)O_3粉体1200℃煅烧5 h时,负载型催化剂具有较好的催化活性;BaZr_(0.9)Y_(0.1)O_3对逆水煤气反应有一定的催化作用,负载少量的Fe_2O_3催化剂可以明显促进CO_2还原,在空速为1.13 h^(-1),温度为650℃时,CO收率可以达到31%;催化剂经过长时间运行催化效果良好,制备的催化剂活性较稳定。

BaZr0.9Y0.1O3with perovskite structure was prepared by solid-phase reaction method and used as support to prepare Fe2O3based catalysts.X-ray diffraction analysis(XRD)and scanning electron microscopy(SEM)were used to observe the crystal phase structure and microscopic morphology of the prepared catalysts.The catalyst performance for the reverse water gas shift reaction was also investigated.The results showed that the supported catalyst has better catalytic activity when the BaZr0.9Y0.1O3pow der was calcined at 1200℃for 5 h.BaZr0.9Y0.1O3has an obvious catalytic effect on the reverse water gas reaction,and the Fe2O3-supported catalyst can significantly promote CO2reduction.M oreover,loading small amount of Fe2O3has apparent effect on the reactivity of the catalyst.When the space velocity was 1.13 h-1,the CO yield can reach 31%at 650℃.Carbon deposition on the catalyst during the CO2reduction process was taking place in a low rate,leading to a significant increase in the CO yield in the process of cooling-dow n experiment.In addition,the activity of the catalyst did not significantly decrease after a long period of reaction,which proved that the activity of the prepared catalyst was relatively stable.