Method for producing catalyst and method for producing unsaturated nitrile
AssigneeAsahi Kasei Kabushiki Kaisha
InventorsKazunari Morii, Akiyoshi Fukuzawa, Masatoshi Kaneta
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Abstract
A method for producing a catalyst, including a slurry preparation step of preparing a slurry comprising a Mo compound, an Fe compound, a Bi compound, and an additive having a decomposition temperature of 500° C. or less; a drying step of drying the slurry to obtain a dried material; and a calcination step of calcining the dried material to obtain a calcined material, wherein the calcination step comprises a step of raising temperature of a calcination atmosphere to a predetermined temperature, and a temperature raising rate is 10° C./min or less at least at a temperature equal to or lower than the decomposition temperature of the additive.
Claims7
A method for producing a catalyst, comprising:
- a slurry preparation step of preparing a slurry comprising a Mo compound, an Fe compound, a Bi compound, and an additive having a decomposition temperature of 500° C. or less;
- a drying step of drying the slurry to obtain a dried material;
- and
- a calcination step of calcining the dried material to obtain a calcined material,
- wherein the calcination step comprises a step of raising temperature of a calcination atmosphere to a predetermined temperature, and a temperature raising rate is 10° C./min or less during a temperature of a calcination atmosphere equal to or lower than the decomposition temperature of the additive in the step,
- the predetermined temperature is 500° C. to 700° C., and
- the method further comprising a step of replacing a gas in the calcination atmosphere with air in a gas replacing time of 180 seconds or less in the calcination step.
Dependencies are inferred from the claim text.