用共沉淀法制备不同摩尔配比的ZrO_2和Al_2O_3混合载体,负载贵金属Pd后,对该催化剂系列进行甲烷燃烧反应的活性表征。利用XRD,BET,BJH孔分布,CO脉冲吸附Pd分散度测定法等技术考察了ZrO_2和Al_2O_3不同配比对混合载体的结构和催化剂性能的影响。结果表明,ZrO_2和Al_2O_3的摩尔比为1:5.8的负载Pd催化剂活性最好,载体中单斜晶相氧化锆和较大孔径分布的催化剂都有助于催化剂活性的改善。 The coprecipitation method was used to prepare ZrO_2 and Al_2O_3 mixed carriers with different molar ratios, and then Pd supported noble metals were used to characterize the activity of methane combustion reaction. The effects of ZrO 2 and Al 2 O 3 ratio on the microstructure and catalytic performance of the mixed support were investigated by XRD, BET, BJH pore distribution and CO pulse dispersion method. The results showed that the supported Pd catalyst with the molar ratio of ZrO2 to Al2 O3 of 1: 5.8 was the best. The monoclinic zirconia and the catalyst with larger pore size distribution all contributed to the improvement of the catalyst activity.