# US 2019/0376435 A1 · System for the removal of particulate matter and noxious compounds from engine exhaust gas

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- Number: US 2019/0376435 A1
- Document ID: US20190376435A1
- Status: Published application
- Kind: A1
- Application number: 16/548,261
- Filed: 2019-08-22
- Published: 2019-12-12
- Earliest claimed: 2015-07-09
- Assignees: Umicore AG & Co. KG
- Applicants: Umicore AG & Co. KG
- Inventors: Keld JOHANSEN; Ton V.W. JANSSENS
- Web page: https://patentgrep.com/patent/US20190376435A1

## CPC

- F01N 13/009: {having two or more separate purifying devices arranged in series}
- B01D 53/9418: {for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas}
- B01D 53/9436: {Ammonia}
- B01D 53/945: {characterised by a specific catalyst}
- B01J 23/30: Tungsten
- B01J 23/42: Platinum
- B01J 35/56: Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional [3D] monoliths
- F01N 3/035: with catalytic reactors
- F01N 3/101: {Three-way catalysts}
- F01N 3/103: {Oxidation catalysts for HC and CO only}
- F01N 3/105: {General auxiliary catalysts, e.g. upstream or downstream of the main catalyst}
- F01N 3/2066: {Selective catalytic reduction [SCR]}
- F01N 3/208: {Control of selective catalytic reduction [SCR], e.g. by adjusting the dosing of reducing agent}
- F01N 3/2842: {specially adapted for monolithic supports, e.g. of honeycomb type (F01N3/2853 - F01N3/2871 take precedence)}
- F01N 13/0093: {the purifying devices are of the same type}
- B01D 2255/1021: Platinum
- B01D 2255/20707: Titanium
- B01D 2255/20723: Vanadium
- B01D 2255/20776: Tungsten
- B01D 2255/30: Silica
- B01D 2255/9022: Two layers
- F01N 2510/06: for exhaust purification, e.g. catalytic reaction
- F01N 2610/02: the substance being ammonia or urea
- Y02A 50/20: Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- 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
- Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

System for the removal of noxious compounds and particulate matter from exhaust gas of a compression ignition engine comprising a three way catalyst unit having an NH3-SCR activity, an ammonia oxidation activity and an adsorption activity of volatile vanadium and tungsten compounds volatilized off an upstream SCR active catalyst.

## Claims

### Claim at position 1

1-14. (canceled)

### Claim 15

A system for the removal of volatile organic com-pounds, particulate matter and nitrogen oxides from exhaust gas of a compression ignition engine comprising
an oxidation unit with a catalyst active in oxidation of volatile organic compounds and carbon monoxide to carbon dioxide and water, and nitrogen oxide to nitro-gen dioxide; and
a catalysed wall flow particulate filter downstream of the oxidation unit, the catalysed wall flow particulate filter comprising a plurality of longitudinal inlet flow channels and outlet flow channels separated by gas permeable porous partition walls, each inlet flow channel having an open inlet end and a closed outlet end, and each outlet flow channel having a closed inlet end and an open outlet end;
wherein the system is adapted for the introduction of a urea solution into the exhaust gas downstream from the catalysed wall flow particulate filter;
wherein the system further comprises an SCR active catalyst downstream of the catalysed wall flow particulate filter to receive exhaust gas into which urea solution has been introduced, the SCR active catalyst comprising oxides of vanadium and tungsten;
wherein the system further comprises a three way catalyst unit downstream of the SCR active catalyst, the three way catalyst unit having an NH3-SCR activity, an ammonia oxidation activity, and an adsorption capacity for volatile vanadium and tungsten compounds volatilized off the SCR active catalyst, the three way catalyst unit comprising compounds selected from the group consisting of metal oxides, zeolites, silica, non-zeolite silica alumina, and mixtures thereof.

### Claim 16 (depends on 15)

The system of claim 15 further comprising a second SCR active catalyst comprising oxides of vanadium, tungsten, and titanium, the second SCR catalyst being arranged between the catalyzed wall flow particulate filter and the three way catalyst unit.

### Claim 17 (depends on 15)

The system according to claim 15, wherein the three way catalyst unit comprises a bottom layer comprising platinum, alumina, and/or titania, and optionally palladium coated on a substrate, and a top layer comprising oxides of vanadium, tungsten, and titanium admixed with at least one of ceria, alumina, silica, zirconia, non-zeolite silica alumina, and zeolite.

### Claim 18 (depends on 17)

The system according to claim 17, wherein the top layer has layer thickness of between 40 μm and 250 μm.

### Claim 19 (depends on 17)

The system according to claim 17, wherein the bottom layer has a layer thickness of between 5 in and 450 μm.

### Claim 20 (depends on 17)

The system according to claim 17, wherein the top layer has a porosity of between 20% and 80%.

### Claim 21 (depends on 15)

The system according to claim 15, wherein the three way catalyst unit comprises a substrate with a flow through monolith shape.

### Claim 22 (depends on 15)

The system according to claim 15, wherein the SCR active catalyst further comprises titania.

### Claim 23 (depends on 21)

The system according to claim 21, wherein the amount of the top layer in the three way catalyst unit is between 50 to 500 g per liter of the substrate.

### Claim 24 (depends on 21)

The system according to claim 21, wherein the amount of the bottom layer in the three way catalyst unit is between 5 and 255 g per liter of the substrate.

### Claim 25 (depends on 17)

The system according to claim 17, wherein the bottom layer of the three way catalyst unit contains 0.0018 g-0.35 g platinum and/or palladium per liter of the substrate.

### Claim 26 (depends on 17)

The system according to claim 17, wherein top layer of the three way catalyst unit comprises, per liter of the substrate, 1.0 g-20 g vanadium pentoxide, 3 g-40 g tungsten oxide, 40 g-460 g titania, 0 g-86 g silica, 0 g-86 g ceria, 0 g-86 g alumina, 0 g-86 g non-zeolite silica alumina, and 0 g-86 g of a zeolite.

### Claim 27 (depends on 15)

The system according to claim 15, wherein the catalyst in oxidation unit comprises platinum and/or palladium supported on silica-alumina and/or alumina and/or titania with a weight ratio of platinum to palladium of 1:0 to 1:1.

### Claim 28 (depends on 27)

The system according to claim 27, wherein the content of platinum and/or palladium is between 0.1 g and 2 g per liter of the catalyst.