Oxidation of propylene and isobutylene to obtain the corresponding unsaturated aldehydes and acids

Abstract From the Canadian patent

Very desirable temperature control in the oxidation of propylene or isobutylene in a fixed-bed tubular reactor, is obtained by using an oxidation catalyst having two physical forms. me first catalyst which initially contacts the reactants is an essentially inert support having a strongly adhering coat of a catalytic material, and the second catalyst that contacts the reactants after contact with the first catalyst consists essentially of the catalytic material.