EP0020799A1
Expired / Lapsed
EP
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Treatment of exhaust gas streams
Assignee: Union Carbide Corp
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Filing: 1979-06-15
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Granted: —
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Expires: 1999-06-15
Abstract
Abstract The treatment of gas streams such as exhaust gases from internal combustion engines to remove carbon monoxide and hydrocarbons by oxidative combustion and NO x constituents by reduction to nitrogen and water is accomplished by contacting the gas streams with a catalyst composition comprising a Group VIII metal supported on the surfaces of the pores of a hydrothermally stable hydrophobic form of zeolite Y.
Inventors
- 👤 Jule Anthony Rabo
- 👤 Richard David Bezman
- 👤 Edward Thomas Wolynic
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 13:03
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
177 words
Oxidation process which comprises contacting at an elevated temperature a mixture of oxygen and at least one carbon-containing compound selected from the group consisting of carbon monoxide and hydrocarbons with a catalyst composition comprising a Group VIII metal having an atomic number greater than 26 supported on a crystalline zeolitic molecular sieve having t a Si0 2 /A1 2 0 3 molar ratio of from about 4.5 to about 35, the essential X-ray powder diffraction pattern of Zeolite Y, an ion exchange capacity of not greater than 0.15, a unit cell dimension, a o , of less than 24.45 Angstroms, a surface area of at least 350 m 2 /g., a sorptive capacity for water at 25°C. and a p/p o value of 0.19 of not greater than 12 weight percent and a Residual Butanol Test value of not more than 0.6 weight percent, at least a portion of said Group VIII metal being deposited in the internal cavities of said molecular sieve, whereby at least a portion of said carbon-containing compound is converted to carbon dioxide.
Claim 2
Dependent Claim
177 words
Oxidation process which comprises contacting at an elevated temperature a mixture of oxygen and at least one carbon-containing compound selected from the group consisting of carbon monoxide and hydrocarbons with a catalyst composition comprising a Group VIII metal having an atomic number greater than 26 supported on a crystalline zeolitic molecular sieve having t a Si0 2 /A1 2 0 3 molar ratio of from about 4.5 to about 35, the essential X-ray powder diffraction pattern of Zeolite Y, an ion exchange capacity of not greater than 0.15, a unit cell dimension, a o , of less than 24.45 Angstroms, a surface area of at least 350 m 2 /g., a sorptive capacity for water at 25°C. and a p/p o value of 0.19 of not greater than 12 weight percent and a Residual Butanol Test value of not more than 0.6 weight percent, at least a portion of said Group VIII metal being deposited in the internal cavities of said molecular sieve, whereby at least a portion of said carbon-containing compound is converted to carbon dioxide.
Claim 3
Dependent Claim
65 words
Process according to claim 1 wherein the crystalline zeolitic molecular sieve has an ion exchange capacity of not greater than 0.070, a unit cell dimension of from 24.20 to 24.45 Angstroms, a sorptive capacity for water at 25°C. and a p/p o value of 0.19 of not greater than 5.00 weight percent, and a Residual Butanol Test value of not more than 0.40 weight percent.
Claim 4
Dependent Claim
47 words
Process according to claim 2 wherein the mixture of oxygen and carbon-containing compound is the water vapor-containing exhaust gas stream from an internal combustion engine and the temperature of contact with said molecular sieve is at-least 400°F. up to the crystal 'destruction temperature of said molecular sieve.
Claim 5
Dependent Claim
12 words
Process according to claim 1 wherein the carbon-containing compound is carbon monoxide.
Claim 6
Dependent Claim
12 words
Process according to claim 1 wherein the carbon-containing compound is a hydrocarbon.
Claim 7
Dependent Claim
11 words
Process according to claim 5 wherein the hydrocarbon is a paraffin.
Claim 8
Dependent Claim
25 words
Process according to claim 1 wherein a major proportion of the Group VIII metal is deposited in the pores of the crystalline zeolitic molecular sieve.
Claim 9
Dependent Claim
11 words
Process according to claim 1 wherein the Group VIII noble metal.
Claim 10
Dependent Claim
41 words
Process according to claim 8 wherein the noble metal is platinum, palladium or a mixture thereof, said noble metal being present in an amount of from 0.1 to 1.6 weight percent based on the anhydrous weight of the zeolitic molecular sieve.
Claim 11
Dependent Claim
171 words
Process for converting NO x to nitrogen which comprises contacting said NO X under essentially neutral redox conditions and at elevated temperature with a catalyst composition comprising a Group VIII metal selected from the group consisting of rhodium, ruthenium, nickel and cobalt supported on a crystalline zeolitic molecular sieve having a Si0 2 /A1 2 0 3 molar ratio of from 4.5 to about 35, the essential X-ray powder diffraction pattern of Zeolite Y, an ion exchange capacity of not greater, than 0.15, a unit cell dimension, a o , of less than 24.45 Angstroms, a surface area of at least 350 m 2 /g., a sorptive capacity for water at 25°C. and a p/p o value of 0.19 of not greater than 12 weight percent and a Residual Butanol Test value of not more than 0.6 weight percent, at least a portion of said Group VIII metal being deposited in the internal cavities of said molecular sieve, whereby at least a portion of said NO x is converted to nitrogen.
Claim 12
Dependent Claim
171 words
Process for converting NO x to nitrogen which comprises contacting said NO X under essentially neutral redox conditions and at elevated temperature with a catalyst composition comprising a Group VIII metal selected from the group consisting of rhodium, ruthenium, nickel and cobalt supported on a crystalline zeolitic molecular sieve having a Si0 2 /A1 2 0 3 molar ratio of from 4.5 to about 35, the essential X-ray powder diffraction pattern of Zeolite Y, an ion exchange capacity of not greater, than 0.15, a unit cell dimension, a o , of less than 24.45 Angstroms, a surface area of at least 350 m 2 /g., a sorptive capacity for water at 25°C. and a p/p o value of 0.19 of not greater than 12 weight percent and a Residual Butanol Test value of not more than 0.6 weight percent, at least a portion of said Group VIII metal being deposited in the internal cavities of said molecular sieve, whereby at least a portion of said NO x is converted to nitrogen.
Claim 13
Dependent Claim
22 words
Process according to claim 10 wherein the Group VIII metal on the molecular sieve base is a combination of platinum and rhodium.
Claim 14
Dependent Claim
65 words
Process according to claim 10 wherein the crystalline zeolitic molecular sieve has an ion exchange capacity of not greater than 0.070, a unit cell dimension of from 24.20 to 24.45 Angstroms, a sorptive capacity for water at 25°C. and a p/p o value of 0.19 of not greater than 5.00 weight percent, and a Residual Butanol Test value of not more than 0.40 weight percent.
Claim 15
Dependent Claim
37 words
Process according to claim 10 NO x is present in a water vapor-containing exhaust gas stream from an internal combustion engine and the temperature of contact with said zeolitic molecular sieve is from about 250°C. to 800°C.
Claim 16
Dependent Claim
36 words
Process according to claim 13 wherein the Group VIII metal is rhodium, said rhodium being present in an amount of from 0.001 to 2.0 weight percent based on the anhydrous weight of the zeolitic molecular sieve.
Claim 17
Dependent Claim
15 words
15 . Process according to claim 13 wherein the temperature is from 450°C. to 600°C.
References Cited (Backward Citations)
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