# US 5,352,646 A · Supported catalysts

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- Number: US 5,352,646 A
- Document ID: US5352646A
- Status: Granted
- Kind: A
- Application number: 08/002,670
- Filed: 1993-01-11
- Granted: 1994-10-04
- Earliest claimed: 1989-11-27
- Assignees: Rhone-Poulenc Chimie
- Inventors: Gilbert Blanchard; Thierry Chopin
- Web page: https://patentgrep.com/patent/US5352646A

## CPC

- B01D 53/945: {characterised by a specific catalyst}
- B01J 23/10: of rare earths
- B01J 35/19: {Catalysts containing parts with different compositions}
- B01J 37/0215: {Coating}
- B01J 35/60: characterised by their surface properties or porosity
- Y02T 10/12: Improving ICE efficiencies
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

Novel supported catalysts, well adapted for the catalytic conversion of exhaust gases emanating from internal combustion engines, include a porous carrier material, e.g., alumina spheres, such porous carrier material having a catalytically effective amount of at least one non-platinum group catalytically active element, e.g., cerium, essentially homogeneously concentrated throughout the depth of a defined peripheral face surface layer (outer band or ring) thereof.

## Claims

### Claim 1

A supported catalyst comprising an entirely porous carrier material, said porous carrier material having a catalytically effective amount of at least one catalytically active element essentially homogeneously concentrated throughout a peripheral face surface layer thereof, said at least one catalytically active element comprising cerium and said surface layer having a depth equal to a depth to which reagents are diffused into the catalyst during catalytic conversion thereof by the catalyst.

### Claim 2 (depends on 1)

The supported catalyst as defined by claim 1, the width of said peripheral face surface layer being essentially constant.

### Claim 3 (depends on 1)

The supported catalyst as defined by claim 1, said porous carrier material having active surface sites.

### Claim 4 (depends on 1)

The supported catalyst as defined by claim 1, said porous carrier material comprising an acidic, basic or amphoteric inorganic oxide.

### Claim 5 (depends on 4)

The supported catalyst as defined by claim 4, said porous carrier material comprising alumina, silica, titanium dioxide, zirconium oxide, cerium oxide or admixture thereof.

### Claim 6 (depends on 5)

The supported catalyst as defined by claim 5, said porous support material comprising essentially spherical particulates.

### Claim 7 (depends on 1)

The supported catalyst as defined by claim 1, comprising catalytically active elements impregnated over the entirety of the face surface of said porous carrier material.

### Claim 8 (depends on 1)

The supported catalyst as defined by claim 1, further comprising a catalytically effective amount of a platinum group element concentrated within a peripheral face surface layer of said porous carrier material.

### Claim 9 (depends on 1)

The supported catalyst as defined by claim 1, further comprising a catalyst promoter.

### Claim 10 (depends on 1)

The supported catalyst as defined by claim 1, wherein the concentration of said at least one catalytically active element, within the volume of said porous carrier material other than said peripheral face surface layer, is essentially zero.

### Claim 11 (depends on 1)

The supported catalyst as defined by claim 1, said peripheral face surface layer being about 400 microns wide.