Pretreatment method for enhancing the selectivity and increasing the stability of a reforming catalyst
AssigneeChevron Research Company
InventorsCharles R. Wilson, Waldeen C. Buss, Leslie A. Field
Life of this patent
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Abstract
A pretreatment method is disclosed for enhancing the selectivity and increasing the stability of a reforming catalyst comprising a large-pore zeolite containing at least one Group VIII metal. In this method, the catalyst is reduced in reducing atmosphere at a temperature of from 250.degree. C. to 650.degree. C., exposed to an oxygen-containing gas, treated in a reducing atmosphere at from 120.degree. C. to 260.degree. C., and maintained at a temperature of from 370.degree. C. to 600.degree. C. in a reducing atmosphere.
Claims17
A pretreatment method for enhancing the selectivity and increasing the stability of a reforming catalyst comprising a large-pore zeolite containing at least one Group VIII metal, wherein said method comprises:
- (a) reducing said catalyst in a reducing atmosphere at a temperature of from 250.degree. C. to 650.degree. C.;
- (b) exposing said reduced catalyst to an oxygen-containing gas;
- (c) treating said exposed catalyst in a reducing atmosphere at from 120.degree. C. to 260.degree. C.;
- and
- (d) maintaining the temperature of the treated catalyst at from 370.degree. C. to 600.degree. C. in a reducing atmosphere.
A pretreatment method for enhancing the selectivity and increasing the stability of a reforming catalyst comprising:
- (A) a type L zeolite containing from 0.1% to 1.5% by weight platinum;
- and
- (B) an inorganic binder selected from the group consisting of silica, alumina, aluminosilicates, and clays;
- wherein said pretreatment method comprises:
- (a) reducing said catalyst in the presence of hydrogen at a temperature of from 350.degree. C. to 550.degree. C.;
- and
- (b) exposing said reduced catalyst to air;
- (c) treating said exposed catalyst in the presence of hydrogen at atmospheric pressure for at least twenty minutes at from 120.degree. C. to 260.degree. C.;
- and
- (d) maintaining the temperature of the treated catalyst at from 370.degree. C. to 600.degree. C. in a reducing atmosphere for about ten minutes.
A pretreatment method for enhancing the selectivity and increasing the stability of a reforming catalyst comprising:
- (A) a type L zeolite containing from 8% to 10% by weight barium and from 0.1% to 1.5% by weight platinum;
- and
- (B) an inorganic binder selected from the group consisting of silica, alumina, aluminosilicates, and clays;
- wherein said pretreatment method comprises:
- (a) reducing said catalyst in the presence of hydrogen at a temperature of from 350.degree. C. to 550.degree. C.;
- and
- (b) exposing said reduced catalyst to air;
- (c) treating said exposed catalyst in the presence of hydrogen at atmospheric pressure for at least twenty minutes at from 120.degree. C. to 260.degree. C.;
- and
- (d) maintaining the temperature of the treated catalyst at from 370.degree. C. to 600.degree. C. in a reducing atmosphere for about ten minutes.
Dependencies are inferred from the claim text.