Patent ID: 7579501
Filing Date: 2009-08-25
Classification: B01J,C07C

Abstract:
1. A process which comprises oxidizing propylene to produce acrolein and/or acrylic acid, by vapor phase oxidation in the presence of a catalyst, wherein the catalyst is a composite oxide catalyst expressed by the following formula (1): (wherein X is at least one kind of element selected from the group consisting of magnesium (Mg), calcium (Ca), zinc (Zn), cerium (Ce), samarium (Sm) and halogen, Y is at least one of element selected from the group consisting of sodium (Na), potassium (K), rubidium (Rb), cesium (Cs) and thallium (Tl), Z is at least one kind of element selected from the group consisting of boron (B), phosphorus (P), arsenic (As) and tungsten (W), the letters a to j are atomic ratios of the respective elements, where if a=12, then b=0.5-7, c=0-10, d=0-10 (where c+d=1-10), e=0.05-3, f=0-2, g=0.04-2, h=0-3 and i=5-48, and j is a numeral which satisfies the oxidation state of the other elements), wherein the catalyst is produced by a process comprising incorporating supply source compounds of the respective elements into a composite in an aqueous solution, and subjecting the composite to heat treatment, comprising a pre-step for producing a catalyst precursor by heat-treating a raw material salt solution containing molybdenum equivalent to partial atomic ratio (a