EP0142351A2
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EP
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Method of preparing an improved catalyst
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1984-11-09
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Granted: —
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Expires: 2004-11-09
Abstract
Abstract A reforming catalyst comprising a type L zeolite containing at least one Group VIII noble metal may be prepared by a method involving contacting the freshly prepared catalyst with oxygen, hydrogen or an inert gas and optionally water at elevated temperatures, contacting the catalyst at elevated temperatures with a source of chlorine such as HCI or Cl 2 and preferably oxygen and water, and contacting the catalyst at elevated temperatures with oxygen and optionally water. Prior to use the catalyst is reduced by contact at elevated temperatures with hydrogen and optionally water. This process enhances the dispersion of the noble metal particles. Preferably the noble metal is platinum and the elevated temperatures range from 480 to 520°C.
Inventors
- 👤 Shun Chong Fung
- 👤 Samuel Jack Tauster
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 23:15
CPC Classifications
C; C10; C10G; C10G35/00; C10G35/04; C10G35/06; C10G35/095; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/60; B01J29/61; B01J29/62
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
50 words
A process for preparing an improved type L zeolite reforming catalyst containing at least one Group VIII noble metal which comprises: (a) improving the dispersion of one or more noble metals by an oxychlorination procedure; (b) removing excess chlorine from the catalyst and stabilizing the noble metal in the catalyst.
Claim 2
Dependent Claim
50 words
A process for preparing an improved type L zeolite reforming catalyst containing at least one Group VIII noble metal which comprises: (a) improving the dispersion of one or more noble metals by an oxychlorination procedure; (b) removing excess chlorine from the catalyst and stabilizing the noble metal in the catalyst.
Claim 3
Dependent Claim
30 words
The process of claim 1 herein the chlorine source-in the oxychlorination procedure is HC1 or C1 2 and steps (a) and (b) are carried out in the presence of water.
Claim 4
Dependent Claim
24 words
The process of claim 1 wherein the catalyst is contacted in step (b) with a gas stream comprising a mixture of steam and oxygen.
Claim 5
Dependent Claim
127 words
A process for preparing an improved reforming catalyst which comprises: (a) heating a freshly prepared reforming catalyst comprising a type L zeolite containing at least one Group VIII noble metal at a temperature from about 380 to 540°C in the presence of an atmosphere comprising oxygen, hydrogen or an inert gas and from 0 to 10% by volume water; (b) subjecting the catalyst to a temperature from about 400 to 530°C, in the presence of a gaseous stream comprising from 0 to 10% by volume water and a source of chlorine; (c) subjecting the catalyst to a temperature from about 400 to 540°C for a period of time less than that required to substantially agglomerate the noble metal in the presence of a gaseous stream comprising oxygen.
Claim 6
Dependent Claim
127 words
A process for preparing an improved reforming catalyst which comprises: (a) heating a freshly prepared reforming catalyst comprising a type L zeolite containing at least one Group VIII noble metal at a temperature from about 380 to 540°C in the presence of an atmosphere comprising oxygen, hydrogen or an inert gas and from 0 to 10% by volume water; (b) subjecting the catalyst to a temperature from about 400 to 530°C, in the presence of a gaseous stream comprising from 0 to 10% by volume water and a source of chlorine; (c) subjecting the catalyst to a temperature from about 400 to 540°C for a period of time less than that required to substantially agglomerate the noble metal in the presence of a gaseous stream comprising oxygen.
Claim 7
Dependent Claim
15 words
The process of claim 4 wherein the source of chlorine in step (b) is HCl.
Claim 8
Dependent Claim
17 words
The process of claim 4 wherein the source of chlorine in step (b) is C1 2 .
Claim 9
Dependent Claim
30 words
The process of claim 4 wherein the source of chlorine in step (b) is a chlorinated hydrocarbon and the gaseous stream also contained an effective amount of hydrogen or oxygen.
Claim 10
Dependent Claim
52 words
The process of claim 4 wherein step (b) comprises (i) treating the catalyst in the presence of hydrogen, and with a gaseous stream comprising chlorine, HC1, and a chlorinated hydrocarbon and (ii) thereafter treating the catalyst, in the presence of oxygen with a gaseous stream comprising chlorine, HCl and a chlorinated hydrocarbon.
Claim 11
Dependent Claim
45 words
The process of claim 8 wherein step (b) comprises (i) treating the catalyst, in the presence of hydrogen, with a gaseous stream comprising chlorine nd HCl and (ii) thereafter treating the catalyst, in the presence of oxygen, with a gaseous stream comprising chlorine and HC1.
Claim 12
Dependent Claim
31 words
1 0 . The process of claim 4 wherein subsequent to step (c) the catalyst is reduced in a gaseous stream comprising hydrogen and about 0.5 to 5.0% by volume water.
Claim 13
Dependent Claim
35 words
The process of claim 4 wherein the type L zeolite has exchangeable cations of which at least 75 percent are selected from the group consisting of lithium, sodium, potassium, rubidium, cesium, calcium and barium cations.
Claim 14
Dependent Claim
55 words
The process of claim 11 wherein the product of step (c) is characterized in that the particles of the noble metal are well dispersed over the surface of the catalyst and greater than about 90% of the noble metal is dispersed in the form of particles having a diameter of less than about 7 R.
Claim 15
Dependent Claim
11 words
The process of claim 6 wherein the exchangeable cation is potassium.
Claim 16
Dependent Claim
11 words
The process of claim 13 wherein the noble metal is platinum.
Claim 17
Dependent Claim
10 words
The..process of claim 4 wherein the zeolite is zeolite L.
Claim 18
Dependent Claim
21 words
The process of claim 4 wherein the product of step (c) has a terminal cracking index of greater than about 1.5.
Claim 19
Dependent Claim
46 words
The process of claim 4 wherein the product of step (c) has a catalyst activity maintenance to provide a benzene yield greater than 7 weight percent after 24 hours using a feed comprising 20 % by volume methylcyclopentane and 80% by volume n-hexane under ECAT conditions.
Claim 20
Dependent Claim
148 words
A process for preparing an improved type L zeolite reforming catalyst containing at least one Group VIII noble metal which comprises: (a) subjecting the catalyst to a temperature from about 380 to 540° and hydrogen; (b) subjecting the catalyst to a temperature from 450 to 530°C in the presence of about 0.5 to 5.0% by volume water and about 0.05 to 1.0% by volume HCl. (c) subjecting the catalyst to a temperature from 480 to 520°C in the presence of a gaseous stream comprising about 0.05 to 1.0% by volume HC1 or about 0.5 to 1.0% by volume chlorine and oxygen; (d) subjecting the catalyst to a temperature from 480 to 520°C, in the presence of oxygen; (e) and thereafter reducing the catalyst in the presence of hydrogen; and in which steps (a) through (e) are conducted in the presence of about 0.5 to 5.0% by volume water.
Claim 21
Dependent Claim
148 words
A process for preparing an improved type L zeolite reforming catalyst containing at least one Group VIII noble metal which comprises: (a) subjecting the catalyst to a temperature from about 380 to 540° and hydrogen; (b) subjecting the catalyst to a temperature from 450 to 530°C in the presence of about 0.5 to 5.0% by volume water and about 0.05 to 1.0% by volume HCl. (c) subjecting the catalyst to a temperature from 480 to 520°C in the presence of a gaseous stream comprising about 0.05 to 1.0% by volume HC1 or about 0.5 to 1.0% by volume chlorine and oxygen; (d) subjecting the catalyst to a temperature from 480 to 520°C, in the presence of oxygen; (e) and thereafter reducing the catalyst in the presence of hydrogen; and in which steps (a) through (e) are conducted in the presence of about 0.5 to 5.0% by volume water.
Claim 22
Dependent Claim
54 words
The process of claim 18 wherein the product of step (e) is characterized in that the particles of noble metal are well dispersed over the surface of the catalyst and greater than about 90% of the noble metal is dispersed dn the form of particles having a diameter of less than about 7 h.
Claim 23
Dependent Claim
30 words
The process of claim 19 wherein at least about 98% of the noble metal is dispersed in the form of particles having a diameter of less than about 7 Å.
Claim 24
Dependent Claim
55 words
A catalyst comprising a type L zeolite containing at least one Group VIII noble metal, characterized in that the particles of the noble metal are.well dispersed over the surface of the catalyst and greaterthan 90% of the noble metal is dispersed in the form of particles having a diameter of less than about 7 Å.
Claim 25
Dependent Claim
55 words
A catalyst comprising a type L zeolite containing at least one Group VIII noble metal, characterized in that the particles of the noble metal are.well dispersed over the surface of the catalyst and greaterthan 90% of the noble metal is dispersed in the form of particles having a diameter of less than about 7 Å.
Claim 26
Dependent Claim
16 words
The catalyst of claim 21 further characterized by the noble metal being in a reduced state.
Claim 27
Dependent Claim
30 words
The catalyst of claim 22 wherein the zeolite comprises exchangeable cations of which 75% are selected from the group consisting of lithium, sodium, potassium, rubidium, cesium, calcium and barium cations.
Claim 28
Dependent Claim
20 words
The catalyst of claim 23 wherein the noble metal is selected from the group consisting of platinum, rhodium, and iridium.
Claim 29
Dependent Claim
71 words
A reforming catalyst comprising zeolite L and containing at least one Group VIII noble metal selected from the group consisting of platinum, rhodium and iridium, exchangeable cations of which 75 % are potassium, the particles of the noble metal are well dispersed over the surface of the catalyst and greater than 90 % of the noble metal is dispersed in the form of particles having a diameter less than 7 Å.
Claim 30
Dependent Claim
71 words
A reforming catalyst comprising zeolite L and containing at least one Group VIII noble metal selected from the group consisting of platinum, rhodium and iridium, exchangeable cations of which 75 % are potassium, the particles of the noble metal are well dispersed over the surface of the catalyst and greater than 90 % of the noble metal is dispersed in the form of particles having a diameter less than 7 Å.
Claim 31
Dependent Claim
14 words
The catalyst of claim 25 wherein the noble metal is in a reduced state.
Claim 32
Dependent Claim
11 words
The catalyst of claim 26 wherein the noble metal is platinum.
Claim 33
Dependent Claim
30 words
The catalyst of claim 27 wherein at least about 98% of the noble metal is dispersed in the form of particles having a diameter of less than about 7 Å.
Claim 34
Dependent Claim
41 words
The catalyst of claim 28 wherein the average size of the crystals of the zeolite is no greater than about 0.2 microns and the noble metal is present in an amount of from about 1.0 to 6% by weight of catalyst.
Claim 35
Dependent Claim
41 words
The catalyst of claim 28 wherein the average size of the crystals of the zeolite is greater than about 0.2 microns and the noble metal is present in an amount of from about 0.1 to 2.0% by weight of the catalyst.
References Cited (Backward Citations)
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