以堇青石蜂窝陶瓷(COR)为载体,采用浸渍法制备了Cu-Mn-O/A12O3/COR,Cu-Mn-Ce-O/Al2O3/COR,Cu-Mn-Zr-O/Al2O3/COR,Cu-Mn-La-O/A12O3/COR和Cu-Mn-Ce-Zr-O/Al2O3/COR5种Cu-Mn复合氧化物整体式催化剂,用于低浓度甲烷催化燃烧反应,并运用X射线光电子能谱,H2程序升温还原及N2吸附-脱附等方法对催化剂进行了表征,考察了助剂CeO2,ZrO2,La2O3和CeO2-ZrO2对Cu-Mn复合氧化物整体式催化剂性能的影响.结果表明,助剂的添加不仅能明显提高催化剂的比表面积、促进各活性组分的分散和表面氧浓度的增加,从而可提高催化剂表面的氧化能力,而且对催化剂的孔结构分布也起到了良好的调节作用,有利于催化剂上反应-扩散耦合行为的匹配；同时,助剂的添加较大幅度地提高了Cu-Mn-O/Al2O3/COR催化剂的活性(尤其是低温催化活性),其中以ZrO2为助剂制备的Cu-Mn-Zr-O/Al2O3/COR整体式催化剂性能最佳,在570℃和20000h-1高空速条件下,可使甲烷转化率达到90％以上,表现出良好的甲烷催化燃烧活性.
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