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• W1973928612 abstract "Catalytically active gold model catalysts have been designed via “size-controlled” gold colloids of 2-nm mean particle size. They were prepared by reduction of chloroauric acid with tetrakis(hydroxymethyl)phosphonium chloride in an alkaline solution, followed by adsorption of gold colloids on TiO 2 and ZrO 2 at a pH lower than the isoelectric point of the metal oxides. Investigation of the size of the gold particles in solution by UV-vis spectrophotometry in combination with HRTEM indicated that the gold colloids are rather stable in alkaline solution, during pH-change and purification with dialysis. Ageing of the solutions showed that the particle size slowly increased over a time scale of 4 months. Analysis of the dried catalysts by XRD and HRTEM corroborated that the particle size was nearly preserved during the immobilization process. Only in the case of high loadings (16.6 wt%, compared to the calculated nominal monolayer coverage of 45–55 wt%), incomplete adsorption occurred, affording more inhomogeneous dispersion and some aggregation. After calcination at 673 K, both zirconia- and titania-based catalysts containing 1.7 wt% Au exhibited high activity in low temperature CO oxidation. Although the particle size on both supports was comparable, the Au/TiO 2 catalyst showed significantly higher activity than the Au/ZrO 2 catalyst. The uncalcined Au/TiO 2 also exhibited high activity, whereas the uncalcined Au/ZrO 2 was inactive under the same conditions, corroborating that not only the gold particle size but also the support plays a key role in CO oxidation." @default.
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• W1973928612 date "1999-01-01" @default.
• W1973928612 modified "2023-10-17" @default.
• W1973928612 title "Preparation of Supported Gold Catalysts for Low-Temperature CO Oxidation via “Size-Controlled” Gold Colloids" @default.
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• W1973928612 doi "https://doi.org/10.1006/jcat.1998.2298" @default.
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