EP0127399A2
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EP
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Zeolite synthesis
Assignee: Mobil Oil AS
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Filing: 1984-05-17
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Granted: —
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Expires: 2004-05-17
Abstract
Abstract The present invention elates to a method for synthesizing porous crystalline zeolite molecular sieves by first preparing a particular zeoiite-forming reaction mixture comprising among other conventional components an alumina source which allows only a gradual release of aluminum or aluminate ions into the reaction mixture as a result of its limited solubility in the reaction mixture. Zeolites produced in this manner can have unique structure and/or crystal morphology and possess especially desirable catalytic properties when used to promote catalytic conversion of organic compounds.
Inventors
- 👤 Pochen Chu
- 👤 James Clarke Vartuli
- 👤 Joseph Anthony Herbst
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 09:32
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/08; B01J29/084; B01J29/40; B01J29/50; B01J29/70; C; C01; C01B; C01B39/00; C01B39/02; C01B39/04; C01B39/20; C01B39/24; C01B39/30; C01B39/305; C01B39/36; C01B39/38; C01B39/40; C01B39/46; C01B39/48
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
143 words
A method for synthesizing a porous crystalline zeolite molecular sieve, which method comprises the steps of A) preparing an aqueous reaction mixture having a composition, in terms of mole ratios of oxides and ions, within the following ranges: wherein M + represents alkali metal or alkaline earth metal ions and R + represents organic cations containing a Group VA element, said Al 2 O 3 being provided at least in part by a deliberately added alumina source of limited solubility in said reaction mixture, said alumina source exhibiting a Degree of Solubility of less than 20 weight percent in water and less than 90 weight percent in caustic solution, and B) maintaining said reaction mixture at a temperature of from 60°C to 350°C and at a pH of from 7 to 14.0 until crystals of said porous crystalline zeolite molecular sieve are formed.
Claim 2
Independent Claim
143 words
A method for synthesizing a porous crystalline zeolite molecular sieve, which method comprises the steps of A) preparing an aqueous reaction mixture having a composition, in terms of mole ratios of oxides and ions, within the following ranges: wherein M + represents alkali metal or alkaline earth metal ions and R + represents organic cations containing a Group VA element, said Al 2 O 3 being provided at least in part by a deliberately added alumina source of limited solubility in said reaction mixture, said alumina source exhibiting a Degree of Solubility of less than 20 weight percent in water and less than 90 weight percent in caustic solution, and B) maintaining said reaction mixture at a temperature of from 60°C to 350°C and at a pH of from 7 to 14.0 until crystals of said porous crystalline zeolite molecular sieve are formed.
Claim 3
Dependent Claim
26 words
A method according to Claim 1 wherein said reaction mixture has a composition, in terms of mole ratios of oxides and ions, within the following ranges:
Claim 4
Dependent Claim
55 words
A method according to Claim 1 or Claim 2 wherein the source of Al 2 O 3 is selected from high temperature transition alumina, transition alumina, trihydrated alumina, monohydrated alumina and mixtures thereof, said trihydrated and monohydrated alumina sources being free from solubilizing pretreatment with alkali metal or alkaline earth metal hydroxide or mineral acid.
Claim 5
Dependent Claim
36 words
A method according to Claim 1 wherein the source of Al 2 O 3 exhibits a Degree of Solubility of less than 5 weight percent in water and less than 50 weight percent in caustic solution.
Claim 6
Dependent Claim
30 words
A method according to Claim 1 wherein the zeolite molecular sieve produced has a silica/alumina mole ratio of at least 12 and a constraint index of from I to 12.
Claim 7
Dependent Claim
34 words
A method according to Claim 1 wherein the zeolite molecular sieve produced is ZSM-5, ZSM-11, ZSM-5/ZSM-11 intermediate, ZSM-12, ZSM-22, ZSM-23, ZSM-34, ZSM-35, ZSM-38, ZSM-45, ZSM-48, ZSM-50, Beta, synthetic offretite, synthetic erionite, or zeolite Y.
Claim 8
Independent Claim
64 words
A method according to any of Claims 1 to 6 further comprising the step of replacing original ions of said zeolite molecular sieve, at least in part, with an ion or mixture of ions selected from hydrogen and hydrogen precursors, rare earth metals, or metals from Groups IA, IIA, IIIA, IVA, IB, IIB, IIIB, IVB, VIB or VIII of the Periodic Table of Elements.
Claim 9
Independent Claim
30 words
A method according to any of Claims 1 to 7 which comprises the additional step of heating the zeolite molecular sieve produced at a temperature of from 200°C to 870°C.
Claim 10
Dependent Claim
18 words
The porous crystalline zeolite molecular sieve material synthesized by the method of any of Claims I to 8.
Claim 11
Dependent Claim
32 words
Use of the porous crystalline zeolite molecular sieve material synthesized by the method of any of Claims 1 to 8 as a catalyst to promote the catalytic conversion of an organic compound.
References Cited (Backward Citations)
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