Preparation of Y zeolite
First Claim
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1. A method for preparing crystalline Y zeolite from a reaction mixture which does not contain an organic template capable of producing Y zeolite, said method comprising:
- (A) preparing in the absence of added binder a self-supporting reaction mixture comprising at least one active, non-zeolitic source of silica, at least one active, non-zeolitic source of alumina, and a source of hydroxide in amounts sufficient to produce Y zeolite, and sufficient water to produce Y zeolite, wherein said reaction mixture has an OH- /SiO2 molar ratio of 0.2 to 0.3; and
(B) maintaining said reaction mixture at a temperature of up to about 130°
C. under crystallization conditions and in the absence of an added external liquid phase for sufficient time to form crystals of Y zeolite.
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Abstract
A method is disclosed for preparing crystalline aluminosilicate Y zeolite from a reaction mixture containing only sufficient water to produce Y zeolite. In one embodiment, the reaction mixture is self-supporting and may be shaped if desired. In the method, the reaction mixture is heated at crystallization conditions and in the absence of an added external liquid phase, so that excess liquid need not be removed from the crystallized product prior to drying the crystals.
27 Citations
28 Claims
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1. A method for preparing crystalline Y zeolite from a reaction mixture which does not contain an organic template capable of producing Y zeolite, said method comprising:
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(A) preparing in the absence of added binder a self-supporting reaction mixture comprising at least one active, non-zeolitic source of silica, at least one active, non-zeolitic source of alumina, and a source of hydroxide in amounts sufficient to produce Y zeolite, and sufficient water to produce Y zeolite, wherein said reaction mixture has an OH- /SiO2 molar ratio of 0.2 to 0.3; and (B) maintaining said reaction mixture at a temperature of up to about 130°
C. under crystallization conditions and in the absence of an added external liquid phase for sufficient time to form crystals of Y zeolite. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 27)
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13. A method for preparing crystalline Y zeolite from a reaction mixture which does not contain an organic template capable of producing Y zeolite, said method comprising:
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(A) preparing in the absence of added binder a self-supporting reaction mixture comprising at least one active, non-zeolitic source of silica, at least one active, non-zeolitic source of alumina, and a source of hydroxide in amounts sufficient to produce Y zeolite, and sufficient water to shape said mixture wherein said reaction mixture has an OH- /SiO2 molar ratio of 0.2 to 0.3; (B) forming said reaction mixture into a shape; and (C) maintaining said reaction mixture at a temperature of up to about 130°
C. under crystallization conditions and in the absence of an added external liquid phase for sufficient time to form crystals of Y zeolite. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 28)
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Specification
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Current AssigneeChevron USA Incorporated (Chevron Corp.)
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Original AssigneeChevron USA Incorporated (Chevron Corp.)
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InventorsMiller, Stephen J.
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Primary Examiner(s)Bell, Mark L.
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Assistant Examiner(s)TROILO, LOUIS
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Application NumberUS08/690,693Time in Patent Office727 DaysField of Search423/700, 423/709, 423/713, 423/716, 423/DIG. 21, 502/79, 502/66, 502/74US Class Current423/700CPC Class CodesB01J 29/126 Y-type faujasiteC01B 39/24 Type Y C01B39/205 takes pre...Y10S 423/21 Faujasite, e.g. X, Y, CZS-3...
