Crystalline silicate zeolite beta of improved stability

Claim 2

A process for preparing a binder-free high silica/alumina ratio Zeolite Beta containing at least one highly dispersed noble metal, comprising: (a) steaming as-synthesized Zeolite Beta in the absence of a binder to produce a Zeolite Beta having a silica-to-alumina ratio of between 100 and 1500 and an alpha value of from 50 to 200; (b) incorporating said at least one noble metal onto the steamed Zeolite Beta produced in step (a); and (c) calcining the product of step (b) in oxygen.

Claim 3

The process according to claim 1, wherein the silica-to-alumina mole ratio of said Zeolite Beta produced in step (a) is between 100 and 500.

Claim 4

The process according to claim 1, wherein said noble metal is platinum.

Claim 5

The process according to claim 3, wherein said Zeolite Beta contains about 0.1 to 3 wt % platinum.

Claim 6

A process for preparing a highly dispersed platinum-containing binder-free Zeolite Beta crystalline zeolite having a silica-to-alumina mole ratio between 100 and 500, said process comprising: (a) contacting an as-synthesized Zeolite Beta in the absence of a binder with an inert gas at a temperature of about 1000° F. at about atmospheric pressure for approximately 2 hours; (b) calcining the product of step (a) in an oxygen environment at a temperature of about 1000° F. for approximately 2 hours; (c) steaming the product of step (b) at a temperature of about 1000° F. for approximately 2 to 16 hours; (d) ammonium-exhanging the product of step (c) to reduce the content of alumina,; (e) incorporating said platinum onto the product of step (d); and (f) calcining the product of step (e) in the presence of oxygen.

Claim 7

A process for preparing a highly dispersed platinum-containing binder-free Zeolite Beta crystalline zeolite having a silica-to-alumina mole ratio between 100 and 500, said process comprising: (a) contacting an as-synthesized Zeolite Beta in the absence of a binder with an inert gas at a temperature of about 1000° F. at about atmospheric pressure for approximately 2 hours; (b) calcining the product of step (a) in an oxygen environment at a temperature of about 1000° F. for approximately 2 hours; (c) steaming the product of step (b) at a temperature of about 1000° F. for approximately 2 to 16 hours; (d) ammonium-exhanging the product of step (c) to reduce the content of alumina,; (e) incorporating said platinum onto the product of step (d); and (f) calcining the product of step (e) in the presence of oxygen.

Claim 8

The process according to claim 5, wherein the calcination step of step (f) comprises: (a) air drying said Zeolite Beta crystalline silicate product of step 6(e); (b) increasing the temperature of said Zeolite Beta crystalline silicate at increments of 1° C. per minute to 130° C.; (c) maintaining said 130° C. temperature for approximately 2 hours; and (d) increasing the temperature of the product of step (c) at increments of 1° C. per minute to 350° C.