# US 2014/0360171 A1 · Catalyst With Improved Hydrothermal Stability

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- Number: US 2014/0360171 A1
- Document ID: US20140360171A1
- Status: Published application
- Kind: A1
- Application number: 14/467,250
- Filed: 2014-08-25
- Published: 2014-12-11
- Earliest claimed: 2013-03-13
- Assignees: BASF SE
- Applicants: BASF Corporation
- Inventors: Wen-Mei Xue; Xinyi Wei; Marcus Hilgendorff; Patrick Burk
- Web page: https://patentgrep.com/patent/US20140360171A1

## CPC

- F01N 3/2066: {Selective catalytic reduction [SCR]}
- B01D 53/94: by catalytic processes
- B01D 53/9418: {for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas}
- B01D 53/944: {Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts (three-way-catalysts [TWC] B01D53/9445)}
- B01D 53/945: {characterised by a specific catalyst}
- B01J 23/002: {Mixed oxides other than spinels, e.g. perovskite}
- B01J 23/10: of rare earths
- B01J 23/63: with rare earths or actinides
- B01J 27/232: Carbonates
- B01J 35/19: {Catalysts containing parts with different compositions}
- B01J 35/45: Nanoparticles
- B01J 35/77: Compounds characterised by their crystallite size
- B01J 37/0201: {Impregnation}
- B01J 37/0248: {Coatings comprising impregnated particles}
- F01N 3/035: with catalytic reactors
- F01N 3/101: {Three-way catalysts}
- B01D 2255/1021: Platinum
- B01D 2255/1023: Palladium
- B01D 2255/1025: Rhodium
- B01D 2255/1028: Iridium
- B01D 2255/2042: Barium
- B01D 2255/2065: Cerium
- B01D 2255/9022: Two layers
- B01D 2255/91: NOx-storage component incorporated in the catalyst
- B01D 2258/012: Diesel engines and lean burn gasoline engines
- B01J 35/30: characterised by their physical properties
- B01J 35/56: Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional [3D] monoliths
- B01J 35/612: {less than 10 m2/g}
- B01J 35/613: {10-100 m2/g}
- B01J 37/10: in the presence of water, e.g. steam
- B01J 2235/15: X-ray diffraction
- B01J 2523/00: Constitutive chemical elements of heterogeneous catalysts
- F01N 2250/02: filtering and catalytic conversion
- F01N 2610/02: the substance being ammonia or urea
- Y02C 20/10: of nitrous oxide (N2O)
- Y02T 10/12: Improving ICE efficiencies
- F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16)
- 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
- Y02C: CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A catalyst for the treatment of exhaust gas emissions is disclosed. The catalyst can comprise ceria-alumina particles having a ceria phase present in a weight percent of the composite in the range of about 20% to about 80% on an oxide basis, an alkaline earth metal component supported on the ceria-alumina particles, wherein the CeO2 is present in the form of crystallites that are hydrothermally stable and have an average crystallite size less than 160 Å after aging at 950° C. for 5 hours in 2% O2 and 10% steam in N2.

## Claims

### Claim 1

A catalyst comprising
ceria-alumina particles having a ceria phase present in a weight percent of the particles in the range of about 20% to about 80% on an oxide basis, an alkaline earth metal component supported on the ceria-alumina particles, wherein the CeO2 is present in the form of crystallites that are hydrothermally stable and have an average crystallite size of less than 160 Å after aging at 950° C. for 5 hours in 2% O2 and 10% steam in N2.

### Claim 2 (depends on 1)

The catalyst of claim 1, wherein the alkaline earth metal component comprises a barium component.

### Claim 3 (depends on 2)

The catalyst of claim 2, wherein the barium component is selected from the group consisting of barium oxide and barium carbonate.

### Claim 4 (depends on 1)

The catalyst of claim 1, wherein the ceria-alumina particles are a composite of ceria and alumina.

### Claim 5 (depends on 2)

The catalyst of claim 2, further comprising at least one platinum group metal selected from the group consisting of platinum, palladium, rhodium, iridium, and mixtures thereof, supported on the ceria-alumina particles.

### Claim 6 (depends on 5)

The catalyst of claim 5, wherein the platinum group metal is selected from platinum, palladium, rhodium, and mixtures thereof.

### Claim 7 (depends on 2)

The catalyst of claim 2, wherein the barium component is present in an amount in the range of about 0.5% to 50% by weight on an oxide basis.

### Claim 8 (depends on 7)

The catalyst of claim 7, wherein the barium component is present in an amount in the range of about 5% to 30% by weight on an oxide basis.

### Claim 9 (depends on 4)

The catalyst of claim 4, wherein the composite of CeO2 and Al2O3 contains ceria in an amount in the range of about 30 to 80% by weight on an oxide basis.

### Claim 10 (depends on 4)

The catalyst of claim 4, wherein the composite of CeO2 and Al2O3 contains ceria in an amount in the range of about 50 to 80% by weight on an oxide basis.

### Claim 11 (depends on 5)

The catalyst of claim 5, wherein the platinum group metal consists essentially of platinum and palladium.

### Claim 12 (depends on 5)

The catalyst of claim 5, wherein the platinum group metal consists essentially of platinum.

### Claim 13 (depends on 1)

The catalyst of claim 1, wherein the catalyst is selected from a three-way catalyst (TWC), diesel oxidation catalyst (DOC), gasoline particulate filter (GPF), lean NOx trap (LNT), integrated lean NOx trap-three way catalyst (LNT-TWC), or ammonia oxidation (AMOX).

### Claim 14 (depends on 1)

A system comprising the catalyst of claim 1 and a lean burn engine upstream from the catalyst.

### Claim 15 (depends on 14)

The system of claim 14 further comprising a second catalyst and, optionally, a particulate filter.

### Claim 16 (depends on 15)

The system of claim 15, wherein the second catalyst is selected from a three-way catalyst (TWC), gasoline particulate filter (GPF), selective catalytic reduction (SCR), lean NOx trap (LNT), ammonia oxidation (AMOX), SCR on a filter (SCRoF), and combinations thereof.