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US 9,580,328 B2Granted
Mesoporous framework-modified zeolites
AssigneeRive Technology, Inc.
InventorsJavier Garcia Martinez, Ernest Senderov, Richard Hinchey
Life of this patent
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Abstract
Compositions and methods for preparing mesoporous and/or mesostructured materials from low Si/Al zeolites. Various embodiments described herein relate to preparation of mesoporous and/or mesostructured zeolites via a framework modification step followed by a mesopore introduction step.
Claims51
A method of forming a material comprising at least one mesoporous zeolite, said method comprising:
- (a) subjecting an initial zeolite to a framework modification process thereby producing a framework-modified zeolite, wherein said framework modification process comprises contacting at least a portion of said initial zeolite with an acid;
- and
- (b) forming a plurality of mesopores in at least a portion of said framework-modified zeolite thereby forming said mesoporous zeolite, wherein said forming comprises contacting at least a portion of said framework-modified zeolite with a base;
- wherein said forming of step (b) is performed in the substantial absence of a surfactant,
- wherein said framework-modified zeolite has not been subjected to drying prior to said forming of step (b),
- wherein said initial zeolite is selected from the group consisting of zeolite A, faujasites, mordenite, CHA, ZSM-5, ZSM-12, ZSM-22, beta zeolite, synthetic ferrierite (ZSM-35), synthetic mordenite, and mixtures of two or more thereof,
- wherein said initial zeolite has a framework silicon-to-aluminum ratio (“Si/Al”) of less than 30, and
- wherein said framework-modified zeolite has a crystalline content that is less than the crystalline content of said initial zeolite as measured by X-ray diffraction (“XRD”).
5 more elements
A method of forming a material comprising at least one desilicated mesoporous zeolite, said method comprising:
- (a) contacting an initial zeolite with an acid thereby forming an acid-pretreated zeolite;
- and
- (b) contacting at least a portion of said acid-pretreated zeolite with a base to at least partially desilicate said acid-pretreated zeolite thereby producing said desilicated mesoporous zeolite,
- wherein said initial zeolite is selected from the group consisting of zeolite A, faujasites, mordenite, CHA, ZSM-5, ZSM-12, ZSM-22, beta zeolite, synthetic ferrierite (ZSM-35), synthetic mordenite, and mixtures of two or more thereof,
- wherein said contacting of step (b) is performed in the substantial absence of a surfactant,
- wherein said acid-treated zeolite has not been subjected to drying prior to said contacting of step (b),
- wherein said initial zeolite has a framework silicon-to-aluminum ratio (“Si/Al”) of less than 30.
4 more elements
A method of forming a mesoporous material, said method comprising
- (a) subjecting an initial zeolite to a framework modification process thereby producing a framework-modified zeolite, wherein said framework modification process comprises contacting at least a portion of said initial zeolite with an acid;
- and
- (b) forming a plurality of mesopores in at least a portion of said framework-modified zeolite thereby forming said mesoporous material, wherein said forming comprises contacting at least a portion of said framework-modified zeolite with a base;
- wherein said forming of step (b) is performed in the substantial absence of a surfactant,
- wherein said framework-modified zeolite has not been subjected to drying prior to said forming of step (b),
- wherein said initial zeolite is selected from the group consisting of zeolite A, faujasites, mordenite, CHA, ZSM-5, ZSM-12, ZSM-22, beta zeolite, synthetic ferrierite (ZSM-35), synthetic mordenite, and mixtures of two or more thereof,
- wherein said initial zeolite has a framework silicon-to-aluminum ratio (“Si/Al”) of less than 30, and
- wherein said mesoporous material has a crystalline content that is at least 90 percent less than the crystalline content of said initial zeolite as measured by X-ray diffraction (“XRD”).
5 more elements
Dependencies are inferred from the claim text.