Reactivity of Olefins for Oxidation over Various Catalysts

Abstract

Activity sequences of variousoxide catalysts foro1e rioxidation and reactivities ofo1es were investigated. When the oxidation reactions of olefins, with less than six carbon atoms, were caGried out on various catalysts and cempared the amounts of products obtained, quantitative relationships are found in the partial oxidation, but net in the complete oxidation. lt is conglude-d that the active sites and the reaction mechanism are identical in the partial oxidation, but different in the complete oxidation, The amount of the partial oxidatieh' preduets is deL termined mainly by the number of active sites, which is affected by the poison of irreversibly adsorbed residue. The relationships between the amounts of the partial exidation preduets and ionization potentials ef the elefin or the diolefin indicate that the adsorbed residue may be the product, diolefin. A bismuth molybdate eatalyst of equiatomic ratio, whieh is known as one of the typical catalysts in olefin oxidation, possesses a speeial low activity in the methacrolein formation, etc. lt seems that this is caused by the characteristic poisoning over the catalyst.