Poisoning and inhibition of catalytic oxidations: I. The effect of silicone vapour on the gas‐phase oxidations of methane, propene, carbon monoxide and hydrogen over platinum and palladium catalysts

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Abstract
The influence of hexamethyldisiloxane (HMDS) on the catalytic oxidations of methane, propene, carbon monoxide and hydrogen has been studied. The oxidations of methane and carbon monoxide were studied over platinum wire and platinum and palladium supported on alumina, silica and 13X zeolite. The rates of oxidation both in the absence and presence of HMDS were found to be influenced by the nature of the catalyst support. For carbon monoxide oxidation, the presence of HMDS revealed that three types of oxidation were occurring. These results, taken with those obtained for the oxidation of hydrogen and propene, show that in general the relative importance of the three types of oxidation depends on the nature of the reaction and the catalyst support.

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