MEASURE THE GENERAL FORMULA MO (DOWN ARROW) 1 (DOWN ARROW) (DOWN ARROW) 2 (DOWN ARROW) (UP ARROW) P (UP ARROW) (DOWN ARROW) A (UP ARROW) V (UP ARROW) V (UP ARROW) (DOWN ARROW) B (DOWN ARROW) (UP ARROW) X (UP ARROW) (UP ARROW) 1 (UP ARROW) (DOWN ARROW) C (DOWN ARROW) (UP ARROW) X (UP ARROW) (UP ARROW) 2 (UP ARROW) (DOWN ARROW) D (DOWN ARROW) (UP ARROW) X (UP ARROW) (UP ARROW) 3 (UP ARROW) (DOWN ARROW) E (DOWN ARROW) (UP ARROW) S (UP ARROW) ( UP ARROW) B (UP ARROW) (DOWN ARROW) F (DOWN ARROW) (UP ARROW) R (UP ARROW) (UP ARROW) E (UP ARROW) (DOWN ARROW) G (DOWN ARROW) (UP ARROW) S ( UP ARROW) (DOWN ARROW) H (DOWN ARROW) (UP ARROW) O (UP ARROW) (DOWN ARROW) N (DOWN ARROW)

摘要

Masses of the general formula I… Mo12PaVbX1cX2dX3eSbfRegShOn (I),… in which the variables are defined as follows:… X1 potassium, rubidium and/or caesium,… X2 copper and/or silver,… X3 cerium, boron, zirconium, manganese and/or bismuth,… a 0.5 to 3.0… b 0.01 to 3.0… c 0.2 to 3.0… d 0.01 to 2.0… e 0 to 2.0… f 0.01 to 2.0… g 0 to 1.0… h 0.001 to 0.5 and… n a number which is determined by the valency and frequency of the elements other than oxygen in I. …??These masses are suitable as catalysts for the production of methacrylic acid by catalytic gas-phase oxidation of methacrolein.