Process for regenerating catalyst
AssigneeSumitomo Chemical Company, Limited
InventorsNaoki Miura, Koichi Nagai, Noriaki Suyasu
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Abstract
A process for regenerating a catalyst consisting of a mixed oxide having molybdenum, bismuth and iron used for preparing an unsaturated aldehyde and/or an unsaturated carboxylic acid by catalytically oxidizing propylene, isobutylene and/or tert.-butanol with molecular oxygen in a gas phase, in which the catalyst is regenerated by thermally treating the deteriorated catalyst in an atmosphere of a gas containing molecular oxygen at a temperature of 200 to 500° C., and then thermally treating the catalyst in the presence of a reducing compound at a temperature of 200 to 500° C.
Claims3
A process for regenerating a catalyst consisting of a mixed oxide comprising molybdenum, bismuth and iron, which is used for preparing an unsaturated aldehyde and/or an unsaturated carboxylic acid by catalytically oxidizing at least one compound selected from the group consisting of propylene, isobutylene and tert.-butanol with molecular oxygen in a gas phase, which process comprises the steps of:
- thermally treating the deteriorated catalyst having a decreased catalytic activity in an atmosphere of a gas containing molecular oxygen at a temperature of 200 to 500° C., and then thermally treating the catalyst in the presence of a reducing compound at a temperature of 200 to 500° C.
Dependencies are inferred from the claim text.