Abstract
Gold catalysts, supported on a solid base of Mg x AlO hydrotalcite, were prepared by a modified deposition precipitation method for CO selective oxidation. The preparation parameters and pretreatment of the catalysts were investigated. The pH and the HAuCl 4 concentration in the initial solution, and the Mg/Al molar ratio of Mg x AlO affected the pH in the final solution and determined the actual gold loading of the catalyst. The calcination temperatures of the Mg x AlO support and the Au/Mg x AlO catalyst dominated the Au 3+/Au 0 ratio on the catalyst. The pretreatment of the catalyst as well as the gold loading and the Au 3+/Au 0 ratio, critically determined the activity of the catalyst for CO selective oxidation. Based on XPS and in situ DR-FTIR analyses, a mechanism for CO selective oxidation on 2%Au/Mg 2AlO was proposed. The hydroxyl group on Mg 2AlO also participated in the reaction.
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