Methods for preparing zeolites with surfactant-templated mesoporosity and tunable aluminum content
AssigneeRive Technology, Inc.
InventorsKunhao Li, Javir Garcia-Martinez
Life of this patent
Estimating the term…
Abstract
Compositions and methods for preparing mesoporous and/or mesostructured materials from low SAR zeolites are provided herewith. In particular, methods are provided that involve: (a) providing a low SAR zeolite, (b) optionally subjecting the low SAR zeolite to an acid framework modification, and (c) subjecting the framework-modified zeolite to a mesopore formation treatment. The resulting mesoporous zeolites can have bi-modal mesoporosity and higher aluminum contents relative to existing mesoporous zeolites.
Claims42
A method of forming a mesoporous zeolite comprising:
- (a) modifying an initial zeolite to thereby yield a low SAR zeolite, wherein said low SAR zeolite has a silica to alumina molar ratio that is at least 5 percent lower than said initial zeolite, wherein said silica to alumina molar ratio of said low SAR zeolite is higher than the destabilizing SAR value of said initial zeolite;
- and
- (b) contacting at least a portion of said low SAR zeolite with a pore forming agent to thereby form said mesoporous zeolite.
A method of forming a mesoporous zeolite comprising:
- (a) providing a low SAR zeolite, wherein said low SAR zeolite is selected from the group consisting of a ZSM-5 having a silica to alumina molar ratio of 17 or less, a mordenite having a silica to alumina molar ratio of 10 or less, a faujasite having a silica to alumina molar ratio of 5 or less, a BEA zeolite having a silica to alumina molar ratio of 15 or less, a LTL zeolite having a silica to alumina molar ratio of 5 or less, an FRE zeolite having a silica to alumina molar ratio of 10 or less, and mixtures thereof;
- and
- (b) contacting at least a portion of said low SAR zeolite with a pore forming agent to thereby form said mesoporous zeolite.
A method of forming a mesoporous zeolite comprising:
- (a) subjecting an initial zeolite to a framework modification process to thereby produce a framework-modified zeolite, wherein said framework-modified zeolite has a silica to alumina molar ratio that is lower than said initial zeolite;
- (b) contacting at least a portion of said framework-modified zeolite with an acid to thereby form an acid-treated zeolite;
- and
- (c) contacting at least a portion of said acid-treated zeolite with a pore forming agent to thereby form said mesoporous zeolite.
A low SAR zeolite, wherein said low SAR zeolite is selected from the group consisting of a ZSM-5 having a silica to alumina molar ratio of 17 or less, a mordenite having a silica to alumina molar ratio of 10 or less, a faujasite having a silica to alumina molar ratio of 5 or less, a BEA zeolite having a silica to alumina molar ratio of 15 or less, a LTL zeolite having a silica to alumina molar ratio of 5 or less, an FRE zeolite having a silica to alumina molar ratio of 10 or less, and mixtures thereof.
A mesoporous zeolite, wherein said mesoporous zeolite has a dV/log(d) in the range of 0.3 to 100 and a mesopore ratio in the range of 0.2 to 1.2.
Dependencies are inferred from the claim text.