Method for producing catalyst and method for producing acrylonitrile
AssigneeAsahi Kasei Kabushiki Kaisha
InventorsShota Aiki, Akiyoshi Fukuzawa
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Abstract
A method for producing a catalyst according to the present invention includes: a preparation step of preparing a precursor slurry comprising molybdenum, bismuth, iron, silica, and a carboxylic acid; a drying step of spray-drying the precursor slurry and thereby obtaining a dried particle; and a calcination step of calcining the dried particle, wherein the preparation step comprises: a step (I) of mixing a starting material for silica with the carboxylic acid and thereby preparing a silica-carboxylic acid mixed liquid; and a step (II) of mixing the silica-carboxylic acid mixed liquid, molybdenum, bismuth, and iron.
Claims12
A method for producing a catalyst, comprising:
- a preparation step of preparing a precursor slurry comprising molybdenum, bismuth, iron, silica, and a carboxylic acid;
- a drying step of spray-drying the precursor slurry and thereby obtaining a dried particle;
- and
- a calcination step of calcining the dried particle, wherein
- the preparation step comprises:
- a step (I) of mixing a starting material for silica with the carboxylic acid and thereby preparing a silica-carboxylic acid mixed liquid;
- and
- a step (II) of mixing the silica-carboxylic acid mixed liquid, molybdenum, bismuth, and iron.
A catalyst comprising a particle, the particle comprising:
- a metal oxide having a bulk composition represented by the following formula (1);
- and
- silica,
- wherein a standard deviation of values obtained by dividing a ratio of a molar concentration of Bi to a molar concentration of Mo on a surface of the catalyst particles by a ratio of a molar concentration of Bi to a molar concentration of Mo in a metal oxide bulk is 0.2 or less:
- Mo12BiaFebXcYdZeOf (1)
- wherein X represents at least one element selected from the group consisting of nickel, cobalt, magnesium, calcium, zinc, strontium, and barium;
- Y represents at least one element selected from the group consisting of cerium, chromium, lanthanum, neodymium, yttrium, praseodymium, samarium, aluminum, gallium, and indium;
- Z represents at least one element selected from the group consisting of potassium, rubidium, and cesium;
- a, b, c, d, e and f represent an atomic ratio of each element, and satisfy 0.1≤a≤3.0, 0.1≤b≤3.0, 0.1≤c≤10.0, 0.1≤d≤3.0, and 0.01≤e≤2.0, respectively, and f represents a value satisfying a balance of atomic valences.
Dependencies are inferred from the claim text.