Catalyst For Producing Unsaturated Aldehyde And/or Unsaturated Carboxylic Acid, Method For Producing Same, And Method For Producing Unsaturated Aldehyde and/or Unsaturated Carboxylic Acid

摘要

Provided is a catalyst having high activity and yield of a target product for producing an unsaturated aldehyde and/or an unsaturated carboxylic acid and further having high mechanical strength. The catalyst is a catalyst prepared by a method in which a catalyst formulation satisfies specified atomic ratios; and in the preparation thereof, a molybdenum component raw material is an ammonium molybdate, a solvent for dissolving the ammonium molybdate is water, a bismuth component raw material is bismuth nitrate, and a solvent for dissolving bismuth nitrate is a nitric acid aqueous solution, and the weight of water for dissolving the ammonium molybdate, the weight of the nitric acid aqueous solution for dissolving the bismuth nitrate, and the acid concentration of the nitric acid aqueous solution are satisfied with specified ranges, respectively.

主权项

1. A catalyst for producing an unsaturated aldehyde and/or an unsaturated carboxylic acid, comprising:
a compound represented by the following formula (1), the catalyst being prepared by a method in which in a step of preparing the compound represented by the following formula (1), a molybdenum component raw material is composed of only ammonium molybdate, a weight of water for dissolving the ammonium molybdate is 8.5 times or less relative to a weight of molybdenum contained in the ammonium molybdate, and a bismuth component raw material is composed of only bismuth nitrate, a weight of a nitric acid aqueous solution for dissolving the bismuth nitrate is 2.3 times or more relative to a weight of bismuth contained in the bismuth nitrate, and a nitric acid concentration of the nitric acid aqueous solution for dissolving the bismuth nitrate is 10% by weight or more:
Mo12BiaFebCocNidXeYfZgOh   Formula (1) wherein X is at least one element selected from the group consisting of magnesium (Mg), calcium (Ca), manganese (Mn), copper (Cu), zinc (Zn), cerium (Ce) and samarium (Sm); Y is at least one element selected from the group consisting of boron (B), phosphorus (P), asthenic (As), antimony (Sb) and tungsten (W); Z is at least one element selected from the group consisting of sodium (Na), potassium (K), rubidium (Rb) and cesium (Cs); a to g represent atomic ratios of the respective components; h is a numerical value determined by degrees of oxidations of the catalyst components; a=0.80 to 2.0, b=1 to 2.5; c=3 to 7; d=2 to 3.5; e=0 to 10; f=0 to 10; g=0.01 to 0.10; h is expressed by the numerical value satisfying oxidation states of other elements; d/a is 1.9 or more and 3.2 or less; d/g is 29 or more and 69 or less; and a/g is 18 or more and 35 or less.