【摘要】 采用溶胶凝胶法制备了双钙钛矿结构Sr2Fe1-xMgxMoO6系列氧化物,通过XRD、BET、XPS、TG等手段对催化材料进行了物性表征;以甲烷纯氧燃烧为目标反应,研究了Mg离子对Fe离子进行掺杂替代对催化材料性能的影响.结果表明:Sr2Fe1-xMgxMoO6主要有两个阶段的失重过程,分别与吸附态氧和晶格氧的失去有关;Mg2+掺杂导致B位有序度的提高,对催化活性不利.更多还原

【Abstract】 A series of double perovskite mixed oxide catalysts nominal Sr2Fe1-xMgxMoO6 was prepared with the sol-gel method and the properties of as-synthesized powders were characterized by XRD,BET,XPS,and TG.The catalytic activity of the Sr2Fe1-xMgxMoO6 for catalytic combustion of methane was tested in a pure oxygen atmosphere without dilute gas.The TG curves exhibit a typical two weight-loss processes similar to that of perovskite oxides.The results reveal that the catalytic activity of Sr2Fe1-xMgxMoO6 is affected by Fe/Mg ratio distinctly.It is suggested that substitution Fe ion with Mg results in the order of structure and the decrease of oxygen vacancy concentration on the surface,which is disadvantageous to the catalysis activity of methane combustion.更多还原