US5068483A
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Catalysts based on zeolites modified by alkali metal elements in the metallic form, their preparation, and their application to alkylation of alkylaromatic derivatives
Assignee: Societe National Elf Aquitaine
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Filing: 1988-11-23
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Granted: 1991-11-26
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Expires: 2008-11-23
Abstract
Abstract PCT No. PCT/FR88/00572 Sec. 371 Date Jul. 12, 1990 Sec. 102(e) Date Jul. 12, 1990 PCT Filed Nov. 23, 1988 PCT Pub. No. WO89/04716 PCT Pub. Date Jun. 1, 1989.Novel catalysts based on X zeolites which contain alkali metal cations other than sodium and modified by inclusion, as additives, of alkali metal elements in the metallic form. These novel catalysts have increased catalytic activity and stability over time in comparison with zeolites in which no alkali metal has been included.
Inventors
- 👤 Denise Barthomeuf
- 👤 Viviane Q. de Quivillic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:36
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/08; B01J29/87; B01J37/00; B01J37/02; B01J37/0238
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
64 words
Catalysts comprising alkali metal cations and aluminosilicates or gallosilicates having a faujasite structure, which contains a Si/Al or Si/Ga molar ratio of less than 1.5 on an elemental basis, wherein at least 10% of the alkali metal cations are selected from at least one of potassium, rubidium, and cesium cations, further comprising inclusions of at least one alkali metal element in the metallic form.
Claim 2
Dependent Claim
64 words
Catalysts comprising alkali metal cations and aluminosilicates or gallosilicates having a faujasite structure, which contains a Si/Al or Si/Ga molar ratio of less than 1.5 on an elemental basis, wherein at least 10% of the alkali metal cations are selected from at least one of potassium, rubidium, and cesium cations, further comprising inclusions of at least one alkali metal element in the metallic form.
Claim 3
Dependent Claim
19 words
Catalysts according to claim 1, wherein the alkali metal cations are at least one of sodium and lithium cations.
Claim 4
Dependent Claim
33 words
Catalysts according to claim 1 wherein said alkali metal element in metallic form is present in proportions that range from 0.1 to 15 wt % relative to the total weight of the catalyst.
Claim 5
Dependent Claim
10 words
Catalysts according to claim 1, further comprising a doping agent.
Claim 6
Dependent Claim
11 words
Catalysts according to claim 4, wherein said doping agent comprises boron.
Claim 7
Dependent Claim
26 words
Catalysts according to claim 1, wherein at least 20% of the alkali metal cations are selected from at least one of potassium, rubidium, and cesium cations.
Claim 8
Dependent Claim
109 words
Process for preparing a catalyst, said catalyst comprising alkali metal cations and aluminosilicates or gallosilicates having a faujasite structure which contains a Si/Al or Si/Ga molar ratio of less than 1.5 on an elemental basis, wherein at least 10% of the alkali metal cations are selected from at least one of potassium, rubidium, and cesium cations, further comprising inclusions of at least one alkali metal element in the metallic form, wherein said process comprises subjecting said aluminosilicate or said gallosilicate to the action of a reagent selected from the group consisting of vapors of alkali metals, and alkali metal derivatives capable of decomposing to give a corresponding alkali metal.
Claim 9
Dependent Claim
109 words
Process for preparing a catalyst, said catalyst comprising alkali metal cations and aluminosilicates or gallosilicates having a faujasite structure which contains a Si/Al or Si/Ga molar ratio of less than 1.5 on an elemental basis, wherein at least 10% of the alkali metal cations are selected from at least one of potassium, rubidium, and cesium cations, further comprising inclusions of at least one alkali metal element in the metallic form, wherein said process comprises subjecting said aluminosilicate or said gallosilicate to the action of a reagent selected from the group consisting of vapors of alkali metals, and alkali metal derivatives capable of decomposing to give a corresponding alkali metal.
Claim 10
Dependent Claim
58 words
Process according to claim 7, wherein said alkali metal derivative is in the form of a powder and is incorporated into said aluminosilicate or said gallosilicate by mechanical mixing, or wherein said alkali metal derivative is in the form of a solution or suspension in a liquid and is incorporated into said aluminosilicate or said gallosilicate by impregnation.
Claim 11
Dependent Claim
24 words
Process according to claim 7, wherein said alkali metal derivative is selected from the group consisting of alkali metal azides and alkali metal amides.
Claim 12
Dependent Claim
15 words
Process according to claim 7, wherein said catalyst is subjected to a heat treatment step.
Claim 13
Dependent Claim
15 words
Use of a catalyst as claimed in claim 1 in alkylation reactions of alkylaromatic derivatives.
Claim 14
Dependent Claim
68 words
Process for alkylating alkylaromatic derivatives of the formula: ##STR3## wherein R represents a lower alkyl group and n is a whole number equal to 0, 1, or 2, representing the number of R substituents present in the molecule, with an alkylating reagent selected from the group consisting of methanol, formaldehyde, and methylal, wherein the reaction is conducted in the presence of a catalyst as claimed in claim 1.
Claim 15
Dependent Claim
19 words
Process according to claim 10, wherein the heat treatment is performed at a temperature of at least 450° C.
Claim 16
Dependent Claim
15 words
Process according to claim 10, wherein the heat treatment is performed at about 500° C.
References Cited (Backward Citations)
US2882244A
Cited
US3013987A
Cited
GB1177169A
Cited
US4483937A
Cited
EP0161727A2
Cited
DE3606706A1
Cited
US4689316A
Cited
US4916100A
Cited
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