Using combined XAS/DRIFTS to study CO/NO Oxidation over Pt/Al2O3 catalysts

16th International Conference on X-ray Absorption Fine Structure

Gänzler, A.M.^1 ; Lichtenberg, H.^1,2 ; Frenkel, A.I.^3 ; Casapu, M.^1 ; Boubnov, A.^1 ; Wang, D.^4 ; Grunwaldt, J.-D.^1,2

Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology (KIT), Karlsruhe

76131, Germany^1

Institute of Catalysis Research and Technology, Karlsruhe Institute of Technology (KIT), Karlsruhe

76131, Germany^2

Physics Department, Yeshiva University, 245 Lexington Avenue, New York

NY

10016, United States^3

Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), Karlsruhe

76131, Germany^4

关键词: CO adsorption;    Diffuse reflectance infrared fourier transform spectroscopies;    Low temperatures;    Oxidation conditions;    Oxidation state;    Oxidation state of Pt;    Pt/Al2O3 catalyst;    Reaction atmospheres;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/712/1/012045/pdf
DOI  :  10.1088/1742-6596/712/1/012045

来源: IOP

【 摘 要 】

Combined X-ray absorption spectroscopy (XAS) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) were applied to investigate the interaction between reaction atmosphere, adsorbates and Pt oxidation state of Pt/Al2O3model diesel oxidation catalysts under CO/NO oxidation conditions. The Pt oxidation state was correlated to the adsorbates on the catalyst's surface. Even at low temperature the reaction atmosphere had a strong impact on the oxidation state of the catalyst, and the oxidation state in turn strongly affected CO adsorption on the Pt particles.