中文摘要：

考察了载体与催化剂焙烧温度对Pd/Al2O3催化剂上低浓度甲烷催化燃烧反应性能的影响.采用X射线衍射、透射电镜、N2物理吸附、NH3程序升温脱附和O2程序升温氧化等手段对载体和催化剂进行了表征.结果表明,焙烧温度对催化剂活性及稳定性的影响显著.随着载体焙烧温度的升高,Al2O3的比表面积、物相结构、酸中心的数量及强度明显改变,相应的Pd/Al2O3催化剂中载体与Pd的相互作用减弱,Pd分散度降低.当载体焙烧温度为1100℃,Pd/Al2O3焙烧温度为200℃时,所得催化剂在260h的连续反应中,甲烷转化率始终维持在99%以上.

英文摘要：

The effect of calcination temperature for the support and catalyst on the catalytic properties of the Pd/Al2O3 catalyst for lean methane combustion was investigated.The Pd/Al2O3 catalyst was prepared by the impregnation method using Al2O3 support calcined at 500–1300℃.All catalyst samples were characterized by X-ray diffraction,transmission electron microscopy,surface area measurements,temperature-programmed desorption of NH3,and temperature-programmed oxidation of O2.Calcination temperature significantly affected the catalyst activity and stability.As the calcination temperature increased,the structure of the support and the amount and intensity of the acid sites changed obviously,and the dispersion of the active component and the interaction between the support and active component decreased.The proper calcination temperature for the Al2O3 support was 1100℃,and the optimal calcination temperature for the Pd/Al2O3 was 200℃.This catalyst showed high thermal stability and catalytic activity.