Oxidation catalyst, especially for the preparation of...

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B - Operations, Transporting

01

J

252/52.K, 260/52

B01J 23/16 (2006.01) B01J 27/19 (2006.01) C07C 51/235 (2006.01) C07C 51/25 (2006.01)

Patent

CA 1190539

ABSTRACT OF THE DISCLOSURE Oxidation catalysts which in addition to oxygen ions, with or without NH4+ ions, con- molybdenum, tungsten, phosphorus and antimony as basic components, in the atomic ratio Mo:W:P:Sb =12:0.1-3: 0.1-4:0.1-3, and which are prepared in a conventional manner by combining molybdenum, phosphorus, antimony and tungsten compounds in aqueous solutions or suspensions, removing the water and calcining the residues, the com- bination being carried out at chloride ion concentra- tions of less than 0.3 mole per mole of molyb- denum and in the presence of ions of monocarboxylic acids of 1 or 2 carbon atoms, dicarboxylic acids or hydroxy- carboxylic acids, are particularly suitable for the gas phase oxidation of methacrolein to methacrylic acid.

423141

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