中文摘要：

采用浸渍法制备了Pd质量分数为0.1%～1.0%的Pd/SiO2和Pd/5%CexZr1-xO2/SiO2(x=0.0～1.0)系列催化剂,在微型固定床反应器上对催化剂的甲烷催化燃烧性能进行了评价,用XRD、H2-TPR等分析测试技术对催化剂的结构进行了表征.结果表明,Pd/SiO2和Pd/CexZr1-xO2/SiO2催化剂都具有较好的甲烷催化燃烧活性,CexZr1-xO2可以明显提高催化剂的催化活性,并且Ce和Zr的比值对催化剂催化活性也有显著的影响.XRD和TPR显示,Pd/CexZr1-xO2/SiO2催化剂中的CexZr1-xO2对PdO的分散性和还原性有较好的促进作用.

英文摘要：

A series of Pd/SiO2 and Pd/CexZr1-xO2/SiO2 (x = 0–1) catalysts with Pd loading from 0.1%to 1.0%were prepared by impregnation and characterized using X-ray powder diffraction and H2-temperature-programmed reduction. Their performance in catalytic methane combustion was evaluated in a conventional quartz reactor. The effects of CeO2 and CeZrO2 solid solutions on the performance of Pd/SiO2 were investigated. The results indicated that Pd/SiO2 exhibit good catalytic activity in methane combustion, and the addition of CexZr1-xO2 can further markedly enhance its catalytic activity. CexZr1-xO2 can promote the dispersion and reducibility of PdO in Pd/CexZr1-xO2/SiO2. The molar ratio of Ce to Zr in CexZr1-xO2 plays an important role on the catalytic activity of Pd/CexZr1-xO2/SiO2.