负载型过渡金属氧化物催化剂上SO_2的还原

REDUCTION OF SULFUR DIOXIDE OVER SUPPORTED TRANSITION METAL OXIDE

研究了γ Al2 O3负载过渡金属氧化物催化剂上CO还原SO2 的反应 ,考察了系列过渡金属对该反应的催化活性 ,发现Fe系催化剂的性能最好。同时对还原反应的条件进行了选择 ,发现在较低温度下 ,大空速不利于SO2 的还原 ,而在较高温度下 ,气体空速对反应影响不大 ,不同的物料配比对反应结果有很大影响 ,当CO∶SO2 =2时 ,最有利于单质硫生成。研究证明 ,金属硫化物是催化SO2 还原反应的活性相 ,该活性相的形成与催化剂的氧化还原能力有关 。

The reduction of sulfur dioxide by carbon monoxide over the transition metal oxide supported on γ Al 2O 3 was studied This paper investigated the effect of reaction conditions on the reduction of sulfur dioxide The results demonstrated that the Fe/γ-Al 2O 3 is the most active catalyst It was shown that the influence of space velocity on reaction was not severe while the ratio of CO/SO 2 plays an important role in the reduction of SO 2 The most effective removal of SO 2 occurred when the CO/SO 2 ratio was the stoichiometric ratio The active phase was identified to be metal sulfides The redox mechanism was confirmed to be the COS intermediate mechanism