| abstract |
When the molybdenum component raw material is only ammonium molybdate, the weight of water to be dissolved is 8.5 times or less with respect to the weight of molybdenum contained in ammonium molybdate, and the bismuth component raw material is only bismuth nitrate, and the weight of the nitric acid solution to be dissolved is bismuth nitrate A catalyst for production of unsaturated aldehydes and/or unsaturated carboxylic acids prepared by a method wherein the nitric acid concentration in an aqueous nitric acid solution in which bismuth nitrate is dissolved is 10 wt% or more, which is 2.3 times or more with respect to the weight of bismuth contained therein. |