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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Due to the need to correct some diagrams this is a corrected reprint.
Dr Mpfunzeni Raphulu is a Senior Scientist at Mintek, in Randburg, South Africa. Having obtained a PhD in catalysis from the University of Witwatersrand in 2004, his main interests are the deactivation of gold catalysts and surface characterisation.
Mr Jason McPherson heads up the Scale-up and Commercialisation Unit of Project AuTEK’s Catalysis Programme (Mintek, South Africa) and as such is actively involved in the production, marketing and application of AuTEK’s AUROliteTM range of gold catalysts. He is highly active in application areas such as CO oxidation, preferential oxidation, liquid phase oxidations (e.g. glucose, glycerol), and selective hydrogenation.
Dr Elma van der Lingen is Manager of the Advanced Materials Division at Mintek, in which Project AuTEK (programme on new industrial uses for gold) is hosted. She is involved in research and development projects in the fields of catalysis, corrosion, electrochemistry, coatings, powder metallurgy, catalysis, nanotechnology and alloy development.
Jim Anderson hold a 6th Century Chair in chemistry at the University of Aberdeen. He is currently chairman of the UK catalysis society (SURCAT) and secretary of EFCATS. His research interests include the use of vibrational spectroscopy to study selectivity effects over supported metals and for site quantification.
Mike Scurrell holds the Chair of Physical Chemistry at the University of the Witwatersrand, Johannesburg and his research interests are associated with surface chemistry and heterogeneous catalysis.
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Raphulu, M., McPherson, J., van der Lingen, E. et al. Investigation of the active site and the mode of Au/TiO2 catalyst deactivation using Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS). Gold Bull 43, 334–344 (2010). https://doi.org/10.1007/BF03215005
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DOI: https://doi.org/10.1007/BF03215005