Abstract:
Very desirable temperature control in the ammoxidation of propylene or isobutylene in a fixed-bed, tubular reactor is obtained by using an oxidation catalyst having two physical forms. The 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.
Abstract:
Catalysts containing phosphorus, vanadium and molybdenum have been found to be especially effective for the oxidation of methacrolein with molecular oxygen to obtain methacrylic acid. The catalysts may be optionally promoted with Bi, As, B, Ce, Cr, Ag, Fe, W, Pb, Mn, Tl, Te, Ni, Nb, B, Sn and/or Cu.