Patent ID: 8722940

Claim:
A catalyst for the oxidation of an olefin to an unsaturated aldehyde comprising a mixed metal oxide having the formula (I): Mo a W b M c M′ d M″ e Z f O g (I) where: M is a trivalent metal selected from the group consisting of trivalent transition metals, trivalent non-transition metals and mixtures thereof; M′ is a divalent metal selected from the group consisting of alkaline earth metals, divalent transition metals, divalent non-transition metals, and/or mixtures thereof; M″ is a monovalent metal selected from the group consisting of alkali metals, monovalent transition metals, and mixtures thereof; Z is an element in the form of an oxide when added to a pre-catalyst preparation and is selected from the group consisting of cerium, antimony, phosphorus, boron, sulfur, silicon, aluminum, titanium, tellurium, vanadium, zirconium, niobium, and mixtures thereof; a is a number between 12.3 and 14.0; b is a number between 0.0 and 0.4; c is a number between 2.0 and 4.0; d is a number between 5.0 and 8.0; e is a number between 0.5 and 1.5; f is a number between 0.5 and 1.5; and g is a number that completes the valency of the formula; wherein the mixed metal oxide has: an anion to cation molar (ACM) ratio greater than 1.00 and less than 2.00; and an M′ to M molar ratio between 1.95 and 2.15, and wherein the ACM ratio is defined as (2×[Mo]+2×[W]) to (3×[M]+2×[M′]+[M″]) or (2×[Mo]+2×[W])/(3×[M]+2×[M′]+[M″]) or 2(a+b)/(3c+2d+e).