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研究了四种载体MgO ,α Al2 O3 ,γ Al2 O3 ,Ce γ Al2 O3 负载Fe催化剂上CO还原SO2 的反应。结果发现 ,以不同载体制备的催化剂上反应的活性和选择性具有相同的顺序 ,即Ce γ Al2 O3 >γ Al2 O3 >α Al2 O3 >MgO。BET表面积测试表明 ,比表面较大的载体有利于提高催化剂的活性 ,而XRD结果证明 ,催化剂的活性大小关键取决于反应过程中是否形成了催化活性相FeS2 ,只有生成FeS2 的催化剂才会在反应过程中表现出活性 ,TPR和TG实验证实 ,催化剂表面氧化还原能力越强越有利于形成FeS2 ,从而在反应过程中表现的活性也越高 ,Ce对γ Al2 O3 的改性一方面促进了反应过程中活性相FeS2 的形成 ,另一方面为反应提供了所需的氧空位 ,使整个反应表现出中间产物机理和氧空位机理的协同效应。
The reaction of SO2 reduction with CO on four supported MgO, α Al2 O3, γ Al2 O3 and Ce γ Al2 O3 supported Fe catalysts was studied. As a result, it was found that the activity and selectivity of the catalysts prepared on the different supports have the same order of Ce γ Al 2 O 3> γ Al 2 O 3> α Al 2 O 3> MgO. BET surface area test showed that the larger surface area of the supporter is conducive to improve the activity of the catalyst, and XRD results show that the catalyst activity depends crucially on the reaction process of the formation of a catalytically active phase FeS2, only the catalyst to generate FeS2 in the reaction TPR and TG experiments confirmed that the stronger the redox ability of the catalyst surface, the more conducive to the formation of FeS2, and thus the higher the activity of the reaction process, Ce on γ Al2 O3 modification on the one hand to promote the reaction The formation of active phase FeS2, on the other hand, provides the required oxygen vacancies for the reaction so that the overall reaction shows a synergistic effect of the intermediate product mechanism and the oxygen vacancy mechanism.