# US 10,118,127 B2 · Catalyst for treating exhaust gas

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- Number: US 10,118,127 B2
- Document ID: US10118127B2
- Status: Granted
- Kind: B2
- Application number: 15/425,448
- Filed: 2017-02-06
- Published: 2017-05-25
- Granted: 2018-11-06
- Earliest claimed: 2014-03-24
- Assignees: Johnson Matthey Public Limited Company
- Applicants: Johnson Matthey Public Limited Company
- Inventors: Guy Richard Chandler; Hai-Ying Chen; Jillian Elaine Collier; Joseph Michael Fedeyko; Alexander Nicholas Michael Green
- Web page: https://patentgrep.com/patent/US10118127B2

## CPC

- B01D 53/9418: {for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas}
- B01D 53/9477: {with catalysts positioned on separate bricks, e.g. exhaust systems}
- B01J 29/072: Iron group metals or copper
- B01J 29/56: Iron group metals or copper
- B01J 29/76: Iron group metals or copper
- B01J 29/763: {CHA-type, e.g. Chabazite, LZ-218}
- B01J 35/40: characterised by dimensions, e.g. grain size (in a colloidal state B01J35/23; crystallite size B01J35/77)
- B01J 35/45: Nanoparticles
- B01J 35/56: Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional [3D] monoliths
- B01J 35/77: Compounds characterised by their crystallite size
- B01J 37/0215: {Coating}
- B01J 37/0246: {Coatings comprising a zeolite}
- B01J 37/08: Heat treatment {(B01J37/0009, B01J37/0018 take precedence)}
- B01J 37/30: Ion-exchange
- F01N 3/035: with catalytic reactors
- F01N 3/103: {Oxidation catalysts for HC and CO only}
- F01N 3/2066: {Selective catalytic reduction [SCR]}
- F01N 3/2842: {specially adapted for monolithic supports, e.g. of honeycomb type (F01N3/2853 - F01N3/2871 take precedence)}
- G06F 9/467: {Transactional memory (G06F9/528 takes precedence)}
- G06F 13/287: {Multiplexed DMA (G06F13/30 takes precedence)}
- G06F 15/17331: {Distributed shared memory [DSM], e.g. remote direct memory access [RDMA]}
- B01D 2251/2062: Ammonia
- B01D 2255/20761: Copper
- B01D 2255/50: Zeolites
- B01D 2255/904: Multiple catalysts
- B01D 2255/9155: Wall flow filters
- B01J 35/19: {Catalysts containing parts with different compositions}
- B01J 2229/186: not in framework positions
- Y02C 20/10: of nitrous oxide (N2O)
- 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
- 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)
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- Y02C: CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]

## Abstract

Provided is a method for reducing N2O emissions in an exhaust gas comprising contacting an exhaust gas containing NH3 and an inlet NO concentration with an SCR catalyst composition containing small pore zeolite having an SAR of about 3 to about 15 and having about 1-5 wt. % of an exchanged transition metal.

## Claims

### Claim 1

A method for reducing N2O emissions in an exhaust gas comprising contacting an exhaust gas containing NH3 and an inlet NO concentration with an SCR catalyst composition containing small pore zeolite having an AEI framework and an SAR of about 3 to about 15 and having about 1-5 wt. % of an exchanged transition metal to produce a purified gas containing an outlet NO concentration and an outlet N2O concentration,
a. wherein the inlet NO concentration and outlet NO concentration have a relative ratio of >about 4, and
b. wherein the inlet NO concentration and outlet N2O concentration have a relative ratio of >about 50.

### Claim 2 (depends on 1)

The method of claim 1, wherein the inlet NO concentration and outlet NO concentration have a relative ratio of >about 5.

### Claim 3 (depends on 1)

The method of claim 1, wherein the inlet NO concentration and outlet NO concentration have a relative ratio of >about 10.

### Claim 4 (depends on 1)

The method of claim 1, wherein the inlet NO concentration and outlet N2O concentration have a relative ratio of >about 80.

### Claim 5 (depends on 4)

The method of claim 4, wherein the inlet NO concentration and outlet N2O concentration have a relative ratio of >about 100.

### Claim 6 (depends on 1)

The method of claim 1, wherein the transition metal is copper.

### Claim 7 (depends on 1)

The method of claim 1, wherein the small pore zeolite has a SAR of about 5 to about 9.

### Claim 8 (depends on 1)

The method of claim 1, wherein the small pore zeolite has a SAR of about 10 to about 15.

### Claim 9 (depends on 1)

The method of claim 1, wherein the NO and NO2 are present in a ratio of about 4:1 to about 1:3 by volume.

### Claim 10 (depends on 1)

The method of claim 1, wherein the NH3 is present in exhaust gas entering the SCR catalyst at an NH3/NO ratio of about 0.5:1 to about 1:2 and an NH3/NO2 ratio of about 1:1 to about 6:3.

### Claim 11

A system for treating an exhaust gas comprising, in series and in fluid communication, a diesel oxidation catalyst, a source of nitrogen-based reductant, and an SCR catalyst, wherein the SCR catalyst comprises a small pore zeolite having an AEI framework and an SAR of about 3 to about 15 and having about 1-5 wt. % of an exchanged transition metal, and wherein the SCR catalyst is coated on a honeycomb wall-flow filter or flow-through monolith or is an extruded honeycomb body.