Method of adding an alkaline earth metal to a zeolitic catalyst

Claim 1

A method of forming a zeolitic catalyst comprising: (a) contacting a type L zeolite with a barium salt solution at a pH of from 8 to 11; (b) drying said contacted type L zeolite at a temperature of from 70° C. to 130° C.; (c) calcining said dried type L zeolite at a temperature of from 500° C. to 700° C.; (d) contacting said calcined type L zeolite with said barium salt solution at a pH of from 8 to 11; (e) drying and calcining said doubly contacted type L zeolite; (f) impregnating the doubly contacted type L zeolite with a Group VIII metal; and (g) drying and calcining the impregnated type L zeolite to form a zeolitic catalyst.

Claim 2

A method of forming a zeolitic catalyst comprising: (a) contacting a type L zeolite with a barium salt solution at a pH of from 8 to 11; (b) drying said contacted type L zeolite at a temperature of from 70° C. to 130° C.; (c) calcining said dried type L zeolite at a temperature of from 500° C. to 700° C.; (d) contacting said calcined type L zeolite with said barium salt solution at a pH of from 8 to 11; (e) drying and calcining said doubly contacted type L zeolite; (f) impregnating the doubly contacted type L zeolite with a Group VIII metal; and (g) drying and calcining the impregnated type L zeolite to form a zeolitic catalyst.

Claim 7

A method of forming a zeolitic catalyst comprising: (a) contacting a potassium-type L zeolite with a barium nitrate solution at a temperature of from 25° C. to 100° C., at a pH of from 8 to 11, over a period of time of from 20 minutes to 4 hours; (b) drying said contacted type L zeolite at a temperature of from 70° C. to 130° C.; (c) calcining said dried type L zeolite at a temperature of from 550° C. to 650° C.; (d) contacting said calcined type L zeolite with said barium nitrate solution at a temperature of from 25° C. to 100° C., at a pH of from 8 to 11, over a period of time of from 20 minutes to 4 hours; (e) drying and calcining said doubly contacted type L zeolite; (f) impregnating said doubly contacted type L zeolite with platinum using tetrammineplatinum (II) nitrate; (g) drying and calcining said impregnated platinum-barium-type L zeolite; (h) reducing said calcined platinum-barium-type L zeolite in hydrogen at 480° C. to 500° C.; (i) mixing said reduced platinum-barium-type L zeolite with an inorganic binder selected from the group consisting of silica, alumina, and aluminosilicates; (j) extruding said mixture through a die to form cylindrical pellets; and (k) drying and calcining said pellets.

Claim 8

A method of forming a zeolitic catalyst comprising: (a) contacting a potassium-type L zeolite with a barium nitrate solution at a temperature of from 25° C. to 100° C., at a pH of from 8 to 11, over a period of time of from 20 minutes to 4 hours; (b) drying said contacted type L zeolite at a temperature of from 70° C. to 130° C.; (c) calcining said dried type L zeolite at a temperature of from 550° C. to 650° C.; (d) contacting said calcined type L zeolite with said barium nitrate solution at a temperature of from 25° C. to 100° C., at a pH of from 8 to 11, over a period of time of from 20 minutes to 4 hours; (e) drying and calcining said doubly contacted type L zeolite; (f) impregnating said doubly contacted type L zeolite with platinum using tetrammineplatinum (II) nitrate; (g) drying and calcining said impregnated platinum-barium-type L zeolite; (h) reducing said calcined platinum-barium-type L zeolite in hydrogen at 480° C. to 500° C.; (i) mixing said reduced platinum-barium-type L zeolite with an inorganic binder selected from the group consisting of silica, alumina, and aluminosilicates; (j) extruding said mixture through a die to form cylindrical pellets; and (k) drying and calcining said pellets.

Claim 9

A method of forming a zeolitic catalyst comprising: (a) mixing a potassium-type L zeolite with an inorganic binder selected from the group consisting of silica, alumina, and aluminosilicates; (b) extruding said mixture through a die to form cylindrical pellets; (c) drying and calcining said pellets; (d) contacting said calcined pellets with a barium nitrate solution at a temperature of from 25° C. to 100° C., at a pH of from 8 to 11, over a period of time of from 20 minutes to 4 hours; (e) drying said contacted pellets at a temperature of from 70° C. to 130° C.; (f) calcining said dried barium-type L zeolite-inorganic oxide pellets at a temperature of from 550° C. to 650° C.; (g) contacting said calcined barium-type L zeolite-inorganic oxide pellets with said barium nitrate solution at a temperature of from 25° C. to 100° C., at a pH of from 8 to 11, over a period of time of from 20 minutes to 4 hours; (h) drying and calcining said doubly contacted pellets; (i) impregnating said doubly contacted pellets with platinum using tetrammineplatinum (II) nitrate; (j) drying and calcining said impregnated pellets; and (k) reducing said calcined platinum-barium-type L zeolite-inorganic oxide pellets in hydrogen at 480° C. to 500° C.

Claim 10

A method of forming a zeolitic catalyst comprising: (a) mixing a potassium-type L zeolite with an inorganic binder selected from the group consisting of silica, alumina, and aluminosilicates; (b) extruding said mixture through a die to form cylindrical pellets; (c) drying and calcining said pellets; (d) contacting said calcined pellets with a barium nitrate solution at a temperature of from 25° C. to 100° C., at a pH of from 8 to 11, over a period of time of from 20 minutes to 4 hours; (e) drying said contacted pellets at a temperature of from 70° C. to 130° C.; (f) calcining said dried barium-type L zeolite-inorganic oxide pellets at a temperature of from 550° C. to 650° C.; (g) contacting said calcined barium-type L zeolite-inorganic oxide pellets with said barium nitrate solution at a temperature of from 25° C. to 100° C., at a pH of from 8 to 11, over a period of time of from 20 minutes to 4 hours; (h) drying and calcining said doubly contacted pellets; (i) impregnating said doubly contacted pellets with platinum using tetrammineplatinum (II) nitrate; (j) drying and calcining said impregnated pellets; and (k) reducing said calcined platinum-barium-type L zeolite-inorganic oxide pellets in hydrogen at 480° C. to 500° C.

Claim 11

A method of forming a zeolitic catalyst comprising: (a) contacting a potassium-type L zeolite with a barium nitrate solution at a temperature of from 25° C. to 100° C., at a pH of from 8 to 11, over a period of time of from 20 minutes to 4 hours; (b) drying said contacted type L zeolite at a temperature of from 70° C. to 130° C.; (c) calcining said dried type L zeolite at a temperature of from 550° C. to 650° C.; (d) contacting said calcined type L zeolite with said barium nitrate solution at a temperature of from 25° C. to 100° C., at a pH of from 8 to 11, over a period of time of from 20 minutes to 4 hours; (e) drying and calcining said doubly contacted type L zeolite; (f) mixing said doubly contacted type L zeolite with an inorganic binder selected from the group consisting of silica, alumina, and aluminosilicates; (g) extruding said mixture through a die to form cylindrical pellets; and (h) drying and calcining said pellets; (i) impregnating said calcined pellets with platinum using tetrammineplatinum (II) nitrate; (j) drying and calcining said impregnated pellets; (k) reducing said calcined platinum-barium-type L zeolite-inorganic oxide pellets in hydrogen at 480° C. to 500° C.

Claim 12

A method of forming a zeolitic catalyst comprising: (a) contacting a potassium-type L zeolite with a barium nitrate solution at a temperature of from 25° C. to 100° C., at a pH of from 8 to 11, over a period of time of from 20 minutes to 4 hours; (b) drying said contacted type L zeolite at a temperature of from 70° C. to 130° C.; (c) calcining said dried type L zeolite at a temperature of from 550° C. to 650° C.; (d) contacting said calcined type L zeolite with said barium nitrate solution at a temperature of from 25° C. to 100° C., at a pH of from 8 to 11, over a period of time of from 20 minutes to 4 hours; (e) drying and calcining said doubly contacted type L zeolite; (f) mixing said doubly contacted type L zeolite with an inorganic binder selected from the group consisting of silica, alumina, and aluminosilicates; (g) extruding said mixture through a die to form cylindrical pellets; and (h) drying and calcining said pellets; (i) impregnating said calcined pellets with platinum using tetrammineplatinum (II) nitrate; (j) drying and calcining said impregnated pellets; (k) reducing said calcined platinum-barium-type L zeolite-inorganic oxide pellets in hydrogen at 480° C. to 500° C.