High temperature combustion catalyst

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A supported precious metal catalyst for the high-temperature combustion of a hydrocarbon comprises 1-10% by weight in total of one or more precious metals on a refractory metal oxide support material, further comprising 1-20% by weight in total of one or more stabilizing metals of elements selected from rare earths and Groups IA, IIA, and IIIA of the periodic table of the elements, wherein at least part of the precious metal is present as a mixed metal oxide with one or more of said stabilizing metals. The catalyst may be prepared by impregnating the refractory metal oxide with a solution of the stabilizing agent and drying and calcining the impregnated support in a first calcination step at a temperature in the range 400-600 oC to form a modified support material and then impregnating the modified support material with a solution of the precious metal and drying and calcining the resulting material in a second calcinations step at a temperature in the range 600-950oC. A reactor for use with the catalyst is also disclosed.