铜锰氧化物水煤气变换催化剂的还原与催化性能

以CuSO₄·5H₂O和MnSO₄·H₂O为前驱物，NaOH为沉淀剂，选用共沉淀工艺，添加Al₂O₃、BaO+Al₂O₃、ZrO₂+Al₂O₃或CeO₂+Al₂O₃粉末作为催化助剂，制备了4种铜锰氧化物水煤气高温变换催化剂。X射线衍射分析表明，4种铜锰氧化物催化剂的主要化学成分为氧化铜和氧化锰系化合物以及锰钡、铜锰和铜锰铝复合氧化物；在催化水煤气变换反应(WGSR)后，4种铜锰氧化物的化学成分发生了变化。H2还原实验结果表明，在4种铜锰氧化物中，添加ZrO₂+Al₂O₃的铜锰氧化物H₂还原效率最好；而添加CeO₂+Al₂O₃的铜锰氧化物H2还原效率最小。对WGSR出口气中CO体积分数进行对比分析可知，分别添加Al₂O₃和CeO₂+Al₂O₃铜锰氧化物催化剂的变换活性较好。

Reducing and catalytic behaviors of copper and manganese oxides water gas shift catalyst

Four Cu-Mn oxides catalysts for high-temperature water gas shift reaction(WGSR) were prepared using CuSO₄·5H₂O and MnSO₄·H₂O as the precursors, NaOH as the precipitating agent, and Al₂O₃, BaO+Al₂O₃, ZrO₂+Al₂O₃ and CeO₂+Al₂O₃ as the promoters. XRD results showed that components of the four catalysts included copper oxide, manganese oxides, barium manganese, copper manganese and Cu-Al-Mn oxides. Chemical composition of the catalysts changed after water gas shift reaction. The catalyst using ZrO₂+Al₂O₃ as the promoter exhibited the highest activity, and that using CeO₂+Al₂O₃ as the promoter was the least active; the catalysts using Al₂O₃ or CeO₂+Al₂O₃ as the promoters were superior to those using BaO+Al₂O₃ or ZrO₂+Al₂O₃ as the promoters.