| abstract |
(57) [Summary] [Object] To provide a novel composite metal oxide composition. The composite metal oxide composition has a two-phase structure and contains one or more of molybdenum, hydrogen, elemental phosphorus, arsenic, boron, germanium and silicon, and one or more of elemental niobium, tantalum and antimony. It contains one or more of the elements copper, iron, cobalt, nickel, zinc, cadmium, manganese, magnesium, calcium, strontium and barium. [Effect] The composite metal oxide composition can be used for producing methacrylic acid by gas phase catalytic oxidation. |