Patent ID: 7012039
Filing Date: 2006-03-14
Classification: B01J,C07C

Abstract:
1. An oxide catalyst composition for use in producing methacrolein or a mixture of methacrolein and methacrylic acid by reacting at least one member selected from the group consisting of isobutylene and t-butanol with a molecular oxygen-containing gas, said oxide catalyst composition being represented by the following formula (I): wherein: A is at least one member selected from the group consisting of lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and |yttrium; B is at least one member selected from the group consisting of potassium, rubidium and cesium; X is cobalt solely, or a mixture of cobalt and at least one member selected from the group consisting of magnesium and nickel; wherein the number of molybdenum (Mo) atoms is in the range of from more than 9 to 12, and the number of tungsten (W) atoms is in the range of from 0 to less than 3, each relative to twelve atoms of the total of molybdenum (Mo) and tungsten (W); and a, b, c, d, e, f and g are, respectively, the atomic ratios of bismuth (Bi), A, B, iron (Fe), X, antimony (Sb) and oxygen (O), relative to twelve atoms of the total of molybdenum (Mo) and tungsten (W),  wherein wherein a, b, c, d and f satisfy the requirements of the following formulae: