JP2003251187A5 - - Google Patents

Claims (6)

A catalyst used in the production of methacrolein and / or methacrylic acid by gas phase catalytic oxidation of isobutane,
Containing molybdenum, a peak value of the binding energy of molybdenum 3d ⁵ trajectory, characterized in that it comprises three 0.2eV higher than the peak value of the binding energy of molybdenum 3d ⁵ trajectory in molybdenum oxide is a high-energy compound methacrolein A catalyst for the production of rain and / or methacrylic acid. The catalyst for producing methacrolein and / or methacrylic acid according to claim 1, comprising the following component (A) and component (B).
Component (A): Solid acid represented by the following formula (1) P _a Mo _b A _c X _d Y _e Z _f O _g (1)
(In the formula (1), P, Mo and O represent phosphorus, molybdenum and oxygen, A represents at least one element selected from the group consisting of vanadium and copper, and X represents antimony, bismuth, arsenic, Represents at least one element selected from the group consisting of germanium, tellurium, silver, selenium, silicon, tungsten and boron, Y is iron, zinc, chromium, magnesium, tantalum, cobalt, manganese, barium, gallium, cerium and Z represents at least one element selected from the group consisting of potassium, rubidium, cesium and thallium, a, b, c, d, e, f and g represent the atomic ratio of each element, and when b = 12, a = 0.1-3, c = 0-3, d = 0-3 e = 0 to 3, a f = 0 to 3, g is the atomic ratio of oxygen required to satisfy the valence of each component.)
Component (B): oxides represented by the following formula _{(2) Mo h D i O} j (2)
(In the formula (2), Mo and O represent molybdenum and oxygen, respectively, and D represents at least one element selected from the group consisting of vanadium, niobium, nickel, antimony, bismuth, iron and zirconium. H, i and j represent the atomic ratio of each element. When h = 1, i is from 0.01 to 1-3, and j is the atomic ratio of oxygen necessary to satisfy the valence of each component.   The catalyst for producing methacrolein and / or methacrylic acid according to claim 2, wherein the content of the component (B) is 1 to 60 parts by mass with respect to 100 parts by mass of the component (A).   The catalyst for producing methacrolein and / or methacrylic acid according to any one of claims 1 to 3, having an average particle size of 0.1 to 3 µm. Mixing the aqueous solution or aqueous slurry containing the component (A) and the component (B), and preparing a mixture having an average particle size of 3 μm or less of the contained particles;
The method for producing a catalyst for producing methacrolein and / or methacrylic acid according to any one of claims 2 to 4, further comprising a step of drying and firing the mixture.   A method for producing methacrolein and / or methacrylic acid by gas-phase catalytic oxidation of isobutane in the presence of the catalyst for producing methacrolein and / or methacrylic acid according to any one of claims 1 to 4.