A process for producing methyl methacrylate, the process comprising contacting reactants comprising methacrolein, methanol and an oxygen-containing gas, under reaction conditions in the presence of a solid catalyst comprising palladium, bismuth and at least one third element X selected from the group consisting of Fe, Zn, Ge, and Pb, wherein the solid catalyst further comprises a support selected from at least one member of the group consisting of silica and alumina.