V助剂对CuO/Al_2O_3上CO_2加H_2合成甲醇的影响

Promotion effect of V on CuO/Al_2O_3 catalyst for methanol synthesis from CO_2 hydrogenation

研究了不同Ｖ 含量助剂对ＣｕＯ／Ａｌ２Ｏ３ 催化剂上ＣＯ２ 加Ｈ２ 合成甲醇的影响，发现Ｖ 助剂在低于５１０Ｋ 时能明显提高催化剂的活性和选择性。Ｘ 射线衍射结果表明，Ｖ 助剂加入后，ＣｕＯ 的分散度明显提高。程序升温还原（ＴＰＲ） 的“ＲＯＲ”法揭示，在ＣｕＯ／Ａｌ２Ｏ３ 催化剂中存在能在室温下被氧化的铜物种，而这种铜物种的含量随Ｖ 负载量的增加而增多。

The effect of V promoter on the CuO/Al 2O 3 catalysts with various of V were studied by CO 2 hydrogenation,XRD and TPR techniques It is found that the catalytic activity and selectivity of the catalysts containing V promoter are both obviously improved below 510K,and this improvement becomes more evident with the increase of V loading XRD and TPR analysis show that V promoter is well dispersed on the surface of Al 2O 3 which could enhance the dispersion of Cu species Highly dispersed Cu species which could be oxided at room temperature is probably responsible for high low temperature activity These Cu species increase with supported V increasing