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The development of a method for making an adherent coating of Au/TiO2 on a cordierite monolith is described. The optimum method entails first forming a wash-coat of TiO2 by combining a colloidal dispersion of TiO2 with Degussa P-25 TiO2 that has been washed, dried and crushed. Subsequent deposition of gold from HAuCl4 solution at pH 9 resulted in a catalyst that was less active for the oxidation of...
Recent intense interest in catalysis by supported gold has focused mainly on the oxidation of CO at low temperatures, which offers the potential for many important applications, including the purification of hydrogen for automotive fuel cells. Numerous, contradictory proposals have been made concerning the nature of the active sites in supported gold catalysts. We now present evidence from a set of...
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