EP0038141A2
Expired / Lapsed
EP
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Preparation of aromatics processing catalyst, catalyst so prepared, and xylene isomerisation therewith
Assignee: Mobil Oil AS
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Filing: 1981-03-31
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Granted: —
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Expires: 2001-03-31
Abstract
Abstract A method of preparing aromatics processing catalysts which comprises incorporating a noble metal with a member or members of a useful class of zeolites, with such incorporation occurring after zeolite crystallization, but prior to final catalyst particle formation, e.g. extrusion into particles. Said useful class of zeolites is characterized by a silica to alumina mole ration of at least 12 and a Constraint Index in the approximate range of 1 to 12. The final catalyst may include a binder such as alumina and is useful in a variety of processes, particularly xylene isomerisation. ,
Inventors
- 👤 Stephen Allan Butter
- 👤 Arthur Warren Chester
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 13:26
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; B01J29/42; B01J29/44; C; C07; C07C; C07C5/00; C07C5/22; C07C5/27; C07C5/2702; C07C5/2724; B01J2229/00; B01J2229/10; B01J2229/26; B01J2229/30; B01J2229/42; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
47 words
A method for preparing a noble metal-containing zeolite catalyst which comprises adding noble metal, in cationic form, to a zeolite prior to final catalyst particle formation, said zeolite having a silica to alumina mole ratio of at least 12 and a Constraint Index of 1 to 12.
Claim 2
Independent Claim
47 words
A method for preparing a noble metal-containing zeolite catalyst which comprises adding noble metal, in cationic form, to a zeolite prior to final catalyst particle formation, said zeolite having a silica to alumina mole ratio of at least 12 and a Constraint Index of 1 to 12.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein said noble metal is ruthenium, rhodium, palladium, silver, osmium, iridium, platinum and/or gold.
Claim 4
Dependent Claim
20 words
The method of claim 1 or claim 2 wherein said zeolite is ZSM-5, ZSM-11, ZSM-12, ZSM-23, ZSM-35, ZSM-38 and/or ZSM-48.
Claim 5
Independent Claim
21 words
The method of any of claims 1 to 3 wherein said noble metal is incorporated into said zeolite by ion exchange.
Claim 6
Independent Claim
20 words
The method of any of claims 1 to 3 wherein said noble metal is incorporated into said zeolite by impregnation.
Claim 7
Independent Claim
22 words
The method of any of claims 1 to 3 wherein said noble metal is added to said zeolite by physical intimate admixing.
Claim 8
Independent Claim
23 words
The method of any preceding claim wherein the noble metal constitutes from 0.005 wt. % to 0.5 wt. % of the final catalyst.
Claim 9
Dependent Claim
22 words
The method of claim 7 wherein the noble metal constitutes from 0.05 wt. % to 0.20 wt. % of the final catalyst.
Claim 10
Dependent Claim
21 words
. The method of any preceding claim wherein said zeolite is mulled with a binder before addition of the noble metal.
Claim 11
Independent Claim
27 words
The method of any of claims 1 to 8 wherein a binder is added after addition of the noble metal but prior to final catalyst particle formation.
Claim 12
Dependent Claim
13 words
The method of claim 9 or claim 10 wherein said binder is alumina.
Claim 13
Independent Claim
18 words
The method of any proceding claim wherein the zeolite has a silica to alumina mole ratio above 200.
Claim 14
Independent Claim
18 words
The method of any preceding claim wherein the zeolite has a silica to alumina mole ratio above 500.
Claim 15
Independent Claim
14 words
The method of any preceding claim wherein the catalyst is subjected to steam treatment.
Claim 16
Independent Claim
21 words
The method of any preceding claim wherein said zeolite has a significant proportion of its cationic sites occupied by basic cations.
Claim 17
Dependent Claim
12 words
The method of claim 15 wherein said basic cations are sodium cations.
Claim 18
Dependent Claim
10 words
The catalyst produced by the method of any preceding claim.
Claim 19
Dependent Claim
50 words
A process for conducting xylene isomerization which comprises contacting a xylene-containing feedstock with a catalyst according to claim 17 at a temperature of 260°C (500°F) to 538°C (1000°F), a pressure of 446 kPa (50 psig) to 6996 kPa (1000 psig) and a weight hourly space velocity between 1 and 50.
Claim 20
Dependent Claim
37 words
A process according to claim 18 wherein the temperature is 427°C(800°F) and to 482°C (900°F), the pressure is 791 kPa (100 psig) to 2859 kPa (400 psig), and the weight hourly space velocity is 5 to 15.
Claim 21
Dependent Claim
21 words
The process of claim 18 or claim 19 which is carried out at a hydrogen/hydrocarbon mole ratio of 1 to 20.
Claim 22
Dependent Claim
14 words
The process of claim 20 wherein said hydrogen/hydrocarbon mole ratio is 3 to 8.
References Cited (Backward Citations)
No citation records indexed.
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