Mitsubishi Rayon Company, Limited

Hiroyuki Naitou

Toru Kuroda

Masahide Kondo

Seiichi Kawato

Takashi Karasuda

Masanori Nitta

Tomoki Fukui

Tomomichi Hino

Disclosed is a method for producing a catalyst, in which physical properties of a dried material or a calcined material in a production process of the catalyst are stable and a change in at least one of a catalyst activity and a selectivity to a target product is small and hence reproducibility of the catalyst is excellent. The present invention is a method for producing a catalyst containing molybdenum, bismuth, and iron, which contains the steps of washing a surface of at least one device equipped in an apparatus for the production of catalyst, to which a solid matter adheres, with a basic solution, and producing the catalyst with the apparatus for the production of catalyst thus washed.

Method for producing catalyst

Process for producing catalyst

A method for producing a catalyst containing given atoms in a given atomic proportion for use in producing methacrylic acid through gas-phase catalytic oxidation of methacrolein with molecular oxygen comprising the steps of:

Process for producing catalyst for methacrylic acid production, catalyst for methacrylic acid production, and process for producing methacrylic acid

In a method of producing a catalyst for the production of methacrylic acid, which has a composition of the following formula (1), when mixing 100 parts by mass of a solution or a slurry (liquid A) containing molybdenum atoms, phosphorous atoms and vanadium atoms in which the content of ammonium species is 0 to 1.5 mol relative to 12 mol of the molybdenum atoms, 5 to 300 parts by mass of a solution or a slurry (liquid B) containing 6 to 17 mol of ammonium species relative to 12 mol of the molybdenum atoms contained in the liquid A and a solution or a slurry (liquid C) containing an element Z such as cesium, the liquid B is mixed with the liquid A, the liquid C or a mixture of the liquid A and the liquid C over 0.1 to 15 minutesPMoVCuXYZO&#x2003;&#x2003;(1).

Process for producing catalysts for the production of methacrylic acid

A method for producing a catalyst containing at least molybdenum, bismuth and iron including the steps of kneading particles containing catalyst components, an organic binder and a liquid, where the organic binder contains at least a high-viscosity organic binder having a viscosity of from 5,000 mPa&#xb7;s to 25,000 mPa&#xb7;s and a low-viscosity organic binder having a viscosity of from 10 mPa&#xb7;s to less than 5,000 mPa&#xb7;s, and extrusion molding the resultant kneaded mixture is provided.

Method for producing catalyst for production of unsaturated aldehyde and unsaturated carboxylic acid

The present invention provides a method for producing a catalyst for use in synthesizing methacrylic acid which can produce methacrylic acid in high yield, the catalyst for use in synthesizing methacrylic acid which can produce methacrylic acid in high yield and a method for producing methacrylic acid in high yield through gas-phase catalytic oxidation of methacrolein with molecular oxygen. The method for producing the catalyst containing molybdenum and phosphorus for use in synthesizing methacrylic acid is composed of the steps of: preparing a slurry containing at least molybdenum and phosphorus and having specific viscosity in the range of 2.5&#xd7;10to 7.0&#xd7;10m/s, which is a value obtained by dividing viscosity (unit: kg/(m&#xb7;s)) by specific gravity (unit: kg/m); obtaining a dried material by drying the slurry; and calcining the dried material at 300 to 500&#xb0; C.

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Hiroshima, Japan

Hiroyuki Naitou