# US 11,298,692 B2 · Active SCR catalyst

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- Number: US 11,298,692 B2
- Document ID: US11298692B2
- Status: Granted
- Kind: B2
- Application number: 16/649,640
- Filed: 2018-09-21
- Published: 2021-11-25
- Granted: 2022-04-12
- Earliest claimed: 2017-10-09
- Assignees: Umicore AG & Co. KG
- Applicants: Umicore AG & Co. KG
- Inventors: Fei Wen; Nicola Soeger; Yvonne Demel
- Web page: https://patentgrep.com/patent/US11298692B2

## CPC

- B01J 29/7615: {Zeolite Beta}
- B01D 53/9418: {for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas}
- B01J 23/42: Platinum
- B01J 35/613: {10-100 m2/g}
- B01J 35/615: {100-500 m2/g}
- B01J 37/0215: {Coating}
- B01J 37/0246: {Coatings comprising a zeolite}
- F01N 3/0842: {Nitrogen oxides}
- F01N 3/2066: {Selective catalytic reduction [SCR]}
- B01D 2251/2062: Ammonia
- B01D 2255/2027: Sodium
- B01D 2255/20738: Iron
- B01D 2255/502: Beta zeolites
- B01D 2255/9155: Wall flow filters
- B01D 2257/404: Nitrogen oxides other than dinitrogen oxide
- B01D 2258/012: Diesel engines and lean burn gasoline engines
- B01J 2229/186: not in framework positions
- F01N 2610/02: the substance being ammonia or urea
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- 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)
- 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)

## Abstract

The invention relates to a catalyst containing a BEA-type zeolite which contains iron as well as 0.05 to 1 percent by weight of sodium, the weight percentage being relative to the iron-exchanged zeolite and being calculated as metallic sodium.

## Claims

### Claim 1

A catalyst which comprises a carrier substrate and a BEA-type zeolite, said BEA-type zeolite comprising iron and sodium, wherein the amount of sodium is calculated as metallic sodium and is 0.05 to 1% by weight of the iron content of the BEA-type zeolite.

### Claim 2 (depends on 1)

The catalyst according to claim 1, wherein the iron content is calculated as Fe2O3 and ranges from 1 to 10% by weight of the BEA-type zeolite.

### Claim 3 (depends on 2)

The catalyst according to claim 2, wherein the iron content is calculated as Fe2O3 and ranges from 3 to 6% by weight of the BEA-type zeolite.

### Claim 4 (depends on 2)

The catalyst according to claim 2, wherein the BEA-type zeolite has a SAR (silica-to-alumina molar ratio) value of 1 to 50.

### Claim 5 (depends on 2)

The catalyst according to claim 2, wherein the BEA-type zeolite has a SAR (silica-to-alumina molar ratio) value of 5 to 35.

### Claim 6 (depends on 2)

The catalyst according to claim 2, wherein the catalyst comprises a sodium content of 0.1 to 1% by weight.

### Claim 7 (depends on 2)

The catalyst according to claim 2, wherein the catalyst comprises a sodium content of 0.5 to 1% by weight.

### Claim 8 (depends on 2)

The catalyst according to claim 2, wherein the catalyst is present in the form of a coating on the carrier substrate.

### Claim 9 (depends on 8)

The catalyst according to claim 8, wherein the carrier substrate is a flow-through substrate or a wall-flow filter.

### Claim 10 (depends on 8)

The catalyst according to claim 8, wherein the carrier substrate is inert and consists of silicon carbide, aluminum titanate, or cordierite.

### Claim 11 (depends on 8)

The catalyst according to claim 8, wherein the catalyst forms a part of the carrier substrate.

### Claim 12 (depends on 1)

A method for purifying exhaust gas of lean-operated combustion engines, which comprises passing an exhaust gas over a catalyst according to claim 1 or a catalyst comprising the BEA-type zeolite.

### Claim 13 (depends on 1)

A system for purifying exhaust gas from lean-operated combustion engines, which comprises a catalyst according to claim 1 or a catalyst comprising the BEA-type zeolite downstream of an injector for an aqueous urea solution.

### Claim 14 (depends on 13)

The system according to claim 13, and further comprising an oxidation catalyst.

### Claim 15 (depends on 14)

The system according to claim 14, wherein the oxidation catalyst comprises platinum on a carrier material.