Method for regenerating a zeolitic catalyst
First Claim
1. A process for regenerating a zeolite catalyst which comprises the following stages (I) and (II):
- (I) Heating a partially or completely deactivated catalyst to 250-600°
C. in an atmosphere which contains less than 2% by volume of oxygen and (II) treating the catalyst at from 250 to 800°
C., preferably from 350 to 600°
C., with a gas stream which contains from 0.1 to 4% by volume of an oxygen-donating substance or of oxygen or of a mixture of two or more thereof.
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Abstract
A process for regenerating a zeolite catalyst comprises the following stages:
(I) Heating a partially or completely deactivated catalyst to 250-600° C. in an atmosphere which contains less than 2% by volume of oxygen,
(II) treating the catalyst at from 250 to 800° C., preferably from 350 to 600° C., with a gas stream which contains from 0.1 to 4% by volume of an oxygen-donating substance or of oxygen or of a mixture of two or more thereof, and
(III) treating the catalyst at from 250 to 800° C., preferably from 350 to 600° C., with a gas stream which contains from more than 4 to 100% by volume of an oxygen-donating substance or of oxygen or of a mixture of two or more thereof.
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Citations
10 Claims
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1. A process for regenerating a zeolite catalyst which comprises the following stages (I) and (II):
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(I) Heating a partially or completely deactivated catalyst to 250-600°
C. in an atmosphere which contains less than 2% by volume of oxygen and(II) treating the catalyst at from 250 to 800°
C., preferably from 350 to 600°
C., with a gas stream which contains from 0.1 to 4% by volume of an oxygen-donating substance or of oxygen or of a mixture of two or more thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification