PROCEDURE FOR THE OXIDATION OF BUTADIENE AND BUTEN WITH CATALYSTS ON THE BASIS OF COBALT AND MOLYBDE

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Disclosed is a catalyst comprising molybdenum, cobalt, oxygen and an alkali metal and/or rare earth metal, and, optionally containing nickel, that is useful in the oxidation of butene and butadiene to furan. The alkali metal is preferably Li or K, and the rare earth metal is preferably Eu.