采用等体积浸渍法制备了不同载体的负载型Pd催化剂，考察了不同载体催化剂在0%、80% CO₂气氛下催化燃烧CH₄的活性，利用XRD、N₂吸脱附测试、O₂-TPD、XPS等对催化剂物理结构和表面性质进行了表征。结果发现，各催化剂的活性受高浓度CO₂抑制程度不同但活性顺序一致，而以NaY为载体的催化剂受CO₂影响较小，与载体较弱的酸性和微孔结构有关；SiO₂由于较强的酸性以及表面较多的非活性氧物种不利于CH₄催化燃烧反应；Pd/Al₂O₃催化剂具有利于气体分子扩散的较大介孔比表面积，并且表面富含CH₄活化所需的吸附氧，因而表现出最佳的催化活性。

Pd based catalysts with different supports are prepared by equal volume impregnation method,and tested for CH₄ combustion under the atmosphere containing 0% and 80% of CO₂.Physical structure and surface properties of catalyst samples are studied by means of XRD,N₂ adsorption and desorption test,O₂-TPD,XPS and other characterization methods.It is found from the results that the activity of each catalyst is variously inhibited by high concentration of CO₂ but the activity sequence is same,and the catalyst with NaY as support is less affected by CO₂,which might be related to the weaker acidity and microporous structure of support.SiO₂ is not conducive to CH₄ combustion reaction due to its strong acidity and more inactive oxygen species on the surface.Pd/Al₂O₃ catalyst exhibits the best catalytic activity because of its rich adsorbed oxygen species required for CH₄ activation on the surface and large mesoporous specific surface area that facilitates the diffusion of gas molecules.

赵永(1994-),男,硕士研究生,研究方向为有机废气催化治理,zhaoy8209@163.com