Catalyst treatment
AssigneeMonsanto Company
InventorEmerson H. Lee
Life of this patent
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Abstract
A process for the regeneration of a spent molybdenum-containing ammoxidation catalyst which comprises heating the catalyst at atmospheric pressure or higher and at 400.degree. C or higher for at least 1 hour in an atmosphere comprising 20-45% by volume of steam, the balance being air or a gas inert to the catalyst under the above conditions.
Claims5
A process for the regeneration of a spent olefin ammoxidation catalyst in which at least 20% of the atoms of the active metallic elements in the catalyst are molybdenum atoms which comprises heating the catalyst at a temperature of from 400.degree. to 650.degree. C and at a pressure of from 1.0 to 2.0 kg/cm.sup.2 in an atmosphere comprising from 20 to 45% by volume of steam, the balance being air or a gas inert to the catalyst under the above conditions, for a period of at least one hour.
A process for the regeneration of an olefin ammoxidation catalyst in which at least 40% of the atoms of the active metallic elements in the catalyst are molybdenum atoms which comprises heating the catalyst composition at substantially atmospheric pressure and a temperature of from 500.degree. to 550.degree. C for a period of 1 to 24 hours under an atmosphere consisting of a mixture of air and steam with a partial pressure of steam of from 200 to 300 mm.
A process for the regeneration of an olefin ammoxidation catalyst composition defined by the following formula:
- Mo.sub.12 Bi.sub.a Fe.sub.b M.sub.m E.sub.e X.sub.x Z.sub.z O.sub.n
- where M is an alkali metal, E is an alkaline earth metal, X is phosphorus, arsenic or antimony, Z is cobalt or nickel, a and b are from 0.1 to 12, m is 0.1 to 8, e is from 0 to 8, x is from 0 to 6, z is from 0 to 12 and n is a number determined by the valence requirements of the other elements present, a, b, m, e, x, and z being chosen such that molybdenum provides at least 20% of the atoms of the active metallic element in the catalyst, which process comprises heating the catalyst composition at substantially atmospheric pressure and a temperature of from 500.degree. to 550.degree. C for a period of 1 to 24 hours under an atmosphere consisting of a mixture of air and steam with a partial pressure of steam of from 200 to 300 mm.
Dependencies are inferred from the claim text.