Gold on other supports

Au/TiC 2 catalysts made by deposition-precipitation have been examined for the PROX reaction 27 they show some differences from Au/Fe203 catalysts. Hydrogen now interferes with the oxidation of carbon monoxide, perhaps by competing for the same adsorption sites this was shown by a marked increase in the order of reaction when hydrogen was present, but not in the oxygen order (see Table 7.2). However, there is no reason to expect that gold particles on these two supports differ in any fundamental 

Au/Ti02 formed by laser vaporisation of gold onto anatase suffered from low activity because the gold content was only 0.02%.13,28 The World Gold Council Au/TiC 2 catalyst performed better, showing 70% selectivity at 80% conversion (353 K). 

Au/CeC 2 catalysts have not so far performed well. Despite some early promise,18 in later work with catalysts prepared by coprecipitation, including some containing lanthanum or gadolinium in the support, high conversions were only achieved at 385 K, although selectivities of 65% were then obtained.29,30 

Heterogeneous Catalysis Principles and Applications, 2nd edition Clarendon Press, Oxford, 1987. 

Farrauto and C.H. Bartholomew, Fundamentals of Industrial Catalytic Processes, Chapman and Hall, London, 1997. 

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