Investigation of the active site and the mode of Au/TiO2 catalyst deactivation using Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) |
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Authors: | M C Raphulu J McPherson E van der Lingen J A Anderson and M S Scurrell |
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Affiliation: | (1) State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, P.O. Box 165, Taiyuan, Shanxi, 030001, China;(2) Graduate University of the Chinese Academy of Sciences, Beijing, 100049, China; |
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Abstract: | CO is a useful probe in the characterization of surface properties of both metal and metal oxide via adsorption. Adsorption
of CO was used to monitor the possible active site of an Au/TiO2 catalyst for the CO oxidation reaction. CO adsorption on the reduced catalyst results in the band at 2104 cm−1 indicative of Au0. During the reaction (in the presence of both CO and O2 present) the band is shifted to higher wave numbers indicating non-competitive adsorption on the surface of Au species. This
study also reveals the relationship between the presence of CO (in the absence of oxygen) and the build-up of surface species
such as bicarbonates, formates and carbonate species which decreases the activity of the catalyst. The presence of both the
reduced and the cationic species of Au seem to be requirement for the activity of the catalyst. |
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