【摘要】 对钙钛矿LaCoO3 在含氧气氛下的预硫化过程进行了研究 .结果表明 ,在一定含氧气氛下硫化后的LaCoO3 催化剂 ,用于含氧气氛下CO还原SO2 反应具有很高的活性 .XRD物相分析结果表明 ,硫化后的LaCoO3 仍保持钙钛矿物相结构 ,但同时出现新的硫化物La2 O2 S和氧化物Co3 O4物相 .通过对硫化前后的催化剂进行O2 TPD和SO2 TPD分析 ,认为CO还原SO2反应机理可能是在一定的温度下 ,在钙钛矿LaCoO3 上发生CO氧化燃烧反应 ,在硫化物La2 O2 S上发生CO还原SO2 反应 ,两者相互促进更多还原

【Abstract】 The catalytic reduction of SO 2 with CO to elemental sulfur was considered to be the best way to get rid of SO 2 from flue gas. However, the catalyst can be poisoned by oxygen in the flue gas. In this study, with pre poisoned by SO 2, activated by O 2 CO and then sulfurized by SO 2 O 2 CO, the perovskite LaCoO 3 had excellent performance in the catalytic reduction of SO 2 with CO to elemental sulfur in the presence of 2%O 2( X (SO 2) =97%, Y (S) =95% at 500 ℃). The XRD result revealed that the perovskite structure of LaCoO 3 was unchanged after activation sulfurization, but new phases La 2O 2S and Co 3O 4 appeared. For the perovskite LaCoO 3 samples before and after activation sulfurization, the experiments of SO 2 TPD, O 2 TPD, and CO combustion in the presence of SO 2 showed that the activation sulfurization of LaCoO 3 can inhibit the formation of sulfate. At certain temperature, CO on the perovskite phase can combust with O 2 quickly, at the same time SO 2 on La 2O 2S phase can be reduced by CO, and the two reactions can be stimulated each other.更多还原