Catalysts for oxidation of methanol to formaldehyde, comprising a
catalytic mixtures of Fe.sub.2(MoO.sub.4).sub.3/MoO.sub.3, wherein the
Mo/Fe atomic ratio ranges from 1.5 to 5, and a compound of cerium
molybdenum and oxygen in a quantity from 0.1 to 10% by weight expressed
as cerium.