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US 8,524,625 B2Granted
Compositions and methods for improving the hydrothermal stability of mesostructured zeolites by rare earth ion exchange
AssigneeRive Technology, Inc.
InventorsLawrence B. Dight, Javier Garcia-Martinez, Ioulia Valla, Marvin M. Johnson
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Abstract
Compositions and methods for preparing mesostructured zeolites having improved hydrothermal stability. Such mesostructured zeolites can be prepared by subjecting a zeolite to rare earth ion exchange prior to and/or subsequent to introducing mesoporosity into the zeolite.
Claims13
A method of forming a material comprising at least one mesostructured zeolite one-phase hybrid single crystal having long-range crystallinity and enhanced hydrothermal stability and microporosity retention after regeneration, comprising the steps of:
- (a) providing a fully-crystalline non-mesoporous zeolite having long-range crystallinity wherein said non-mesoporous zeolite comprises a faujasite;
- (b) adding rare earth elements to said non-mesoporous zeolite;
- (c) acid washing said non-mesoporous zeolite to thereby form an acid-washed zeolite, wherein said acid washing modifies the silicon to aluminum ratio in said non-mesoporous zeolite;
- and
- (d) forming a plurality of mesopores within said acid-washed zeolite to thereby form said mesostructured zeolite, wherein said forming occurs in the presence of at least one surfactant.
2 more elements
Dependencies are inferred from the claim text.