| abstract |
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) In the formula, M represents a trivalent metal, M ' represents a divalent metal, M " represents a monovalent metal, Z represents an element present in the form of an oxide, and a, b, c, d, e, f and g is a number, wherein said catalyst is a molar (ACM) ratio of greater than 1.00 to less than 2.00 and the molar ratio of M 'to M of the anion to the cation is 1.95 to 2.15. |