Abstract
Oxidative conversion of olefinic, alkyl aromatic and naphtenic hydrocarbons over zeolites is sensitive to the zeolite structure and dealumination degree as well as to the nature and concentration of exchange cations. Molecular sieve properties of zeolites were found to have a pronounced effect on the direction of oxidative hydrocarbon conversion and catalyst selectivity. Paujasite type zeolites are found to be very active and selective in the isoprene formation. Narrow pore zeolites exhibit higher selectivity in oxidative dehydrogenation of ethyl benzene than faujasites. Interaction of hydrocarbons and oxygen with various zeolites has been studied by thermodesorption technique. Mobility of zeolite oxygen has been evaluated by isotopic exchange and it has been found that it is not involved in oxidative dehydrogenation; the oxygen adsorbed from the gas phase takes part in the reaction. Catalytic properties of zeolites modified by transition metals were also investigated for comparison.
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