CARBON-CARBON COMPOSITES — CARRIERS FOR HETEROGENEOUS CATALYSTS FOR DEHYDROGENATION OF HYDROCARBONS
Highly-dispersed metals supported on oxide carriers are active in the most of catalytic reactions of hydrocarbons dehydrogenation. Coking is the serious problem of such catalysts. It occurs due to undesirable further dehydrogenation of transition surface forms of hydrocarbons. To solve this problem, additives (Pb, Sn, Re, etc.) are introduced into the catalyst. They reduce the ability of a metal to form multiple bonds of adsorbed forms with the active phase of the catalyst. Recently, carbon materials were proposed as carriers for the task in question .
Among new forms of carbon carriers allowing high specific surface of metal and stable dispersion of its particles, materials obtained by carbonization of polymers hold high interest. Introduction of catalytically active metals into the carbon matrix can be performed as early as in the stage of carbonization, simultaneously increasing their activity and stability.
Keywordshydrocarbon composite carbonization dehydrogenation stability
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