负载型La_(0.8)Sr_(0.2)CoO_3燃烧催化剂的XPS表征

XPS characterization of loaded combustion catalyst La_(0.8)Sr_(0.2)CoO_3

用浸渍法制备负载型La0 .8Sr0 .2 CoO3 燃烧催化剂 ,比较了γ Al2 O3 和堇青石 (Cordierite ,2MgO·2Al2 O3 ·5SiO2 )载体的负载效果和这两种催化剂对二甲苯完全氧化的催化活性 。

Combustion catalysts La 0.8Sr 0.2CoO 3 supported on γ-Al 2O 3 and cordierite (2MgO·2Al 2O 3·5SiO 2) were characterized by XRD and XPS. It was observed that small amount of perovskite-type oxide exists in LSC/cordierite catalyst loaded with 20%(mass fraction) LSC (La 0.8Sr 0.2CoO 3 or corresponding oxides) and heated at 850?℃ or above.On the other hand, at same temperature, no perovskite-type oxide forms in LSC/γ-Al 2O 3 catalyst. XPS results show that the binding energy (BE eV) of Co?2p of LSC/γ-Al 2O 3 is higher than that of Co?2p of LSC/ cordierite due to the form of CoAl 2O 4 phase in LSC/γ-Al 2O 3.So, the catalytic activity of LSC/γ-Al 2O 3 for complete oxidation of xylene is lower.