# US 10,502,107 B2 · Exhaust gas after-treatment unit for an internal combustion engine and procedure for using a drive mechanism with such an exhaust gas after-treatment unit

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,502,107 B2
- Document ID: US10502107B2
- Status: Granted
- Kind: B2
- Application number: 15/778,793
- Filed: 2016-11-14
- Published: 2018-12-06
- Granted: 2019-12-10
- Earliest claimed: 2015-11-26
- Assignees: Daimler AG
- Applicants: Daimler AG
- Inventors: Johannes Bleckmann; Claudia Essmann; Uwe Gaertner; Alexander Massner; Michael Stiller
- Web page: https://patentgrep.com/patent/US10502107B2

## CPC

- F01N 3/035: with catalytic reactors
- B01D 46/0027: {with additional separating or treating functions}
- B01D 53/9418: {for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas}
- B01D 53/9431: {Processes characterised by a specific device}
- B01D 53/9436: {Ammonia}
- B01D 53/9495: {Controlling the catalytic process}
- F01N 3/021: by means of filters
- F01N 3/106: {Auxiliary oxidation catalysts}
- 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 13/009: {having two or more separate purifying devices arranged in series}
- F01N 13/0093: {the purifying devices are of the same type}
- F01N 13/0097: {the purifying devices are arranged in a single housing}
- B01D 2255/20723: Vanadium
- B01D 2255/20761: Copper
- B01D 2255/911: NH3-storage component incorporated in the catalyst
- B01D 2279/30: for treatment of exhaust gases from IC Engines
- F01N 2370/00: Selection of materials for exhaust purification
- F01N 2370/02: used in catalytic reactors
- F01N 2510/06: for exhaust purification, e.g. catalytic reaction
- F01N 2610/02: the substance being ammonia or urea
- F01N 2610/03: the substance being hydrocarbons, e.g. engine fuel
- F01N 2900/1821: Injector parameters
- 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)
- Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

An exhaust gas after-treatment unit for an internal combustion engine, particularly for a motor vehicle, includes a first selective catalytic reduction (SCR) catalytic converter through which the exhaust gas from the internal combustion engine can flow and at least one particle filter for retaining the soot particles from the exhaust gas. The particle filter, which is located downstream from the first SCR catalytic converter, is equipped with a heavy metal and precious metal free catalyzing coating which oxidizes the soot particles retained by the particle filter, where downstream from the particle filter there is a second SCR catalytic converter through which the exhaust gas can flow.

## Claims

### Claim 1

An exhaust gas after-treatment unit for an internal combustion engine, comprising:
a first selective catalytic reduction (SCR) catalytic converter through which exhaust gas from the internal combustion engine is flowable, wherein the first SCR catalytic converter is a first exhaust gas after-treatment element downstream from the internal combustion engine through which the exhaust gas is flowable;
a particle filter, wherein the particle filter is disposed downstream from the first SCR catalytic converter, wherein the exhaust gas is flowable through the particle filter, and wherein soot particles from the exhaust gas are retainable by the particle filter; and
a second SCR catalytic converter through which the exhaust gas is flowable, wherein the second SCR catalytic converter is disposed downstream from the particle filter;
wherein the particle filter has a heavy metal and precious metal free catalyzing coating, wherein soot particles retained by the particle filter are oxidizable by the heavy metal and precious metal free catalyzing coating, and wherein the particle filter is a second exhaust gas after-treatment element through which the exhaust gas is flowable after the exhaust gas has exited the internal combustion engine.

### Claim 2 (depends on 1)

The exhaust gas after-treatment unit according to claim 1, wherein an oxidizing catalytic converter is not included in the exhaust gas after-treatment unit.

### Claim 3 (depends on 1)

The exhaust gas after-treatment unit according to claim 1, wherein the heavy metal and precious metal free catalyzing coating has alkali and alkaline-earth compounds.

### Claim 4 (depends on 1)

The exhaust gas after-treatment unit according to claim 1 further comprising a dosing unit disposed upstream from the first SCR catalytic converter, wherein a reduction agent for denoxing the exhaust gas is introducible to the exhaust gas by the dosing unit.

### Claim 5 (depends on 4)

The exhaust gas after-treatment unit according to claim 4 further comprising a control and/or regulating system which, periodically and/or under given operating conditions, causes an injection or switching off of the reduction agent for a predefined time frame.

### Claim 6 (depends on 1)

The exhaust gas after-treatment unit according to claim 1, wherein the first SCR catalytic converter has a smaller ammonia storage capacity than the second SCR catalytic converter.

### Claim 7 (depends on 1)

The exhaust gas after-treatment unit according to claim 1, wherein the first SCR catalytic converter has a first volume through which the exhaust gas is flowable and the second SCR catalytic converter has a second volume through which the exhaust gas is flowable and wherein the first volume is smaller than the second volume.

### Claim 8 (depends on 1)

The exhaust gas after-treatment unit according to claim 1 further comprising a dosing unit disposed upstream from the particle filter, wherein unconsummated hydrocarbons are introducible to the exhaust gas by the dosing unit.

### Claim 9 (depends on 1)

The exhaust gas after-treatment unit according to claim 1 further comprising an ammonia slip catalyst through which the exhaust gas is flowable, wherein the ammonia slip catalyst is disposed downstream from the second SCR catalytic converter.

### Claim 10 (depends on 9)

The exhaust gas after-treatment unit according to claim 9, wherein a volume of the first SCR catalytic converter has a ratio to a total volume which is comprised of a volume of the second SCR catalytic converter and a volume of the ammonia slip catalyst of approximately 0.3 to 0.8.

### Claim 11 (depends on 1)

A drive mechanism for a motor vehicle, comprising:
an internal combustion engine; and
an exhaust gas after-treatment unit according to claim 1, wherein exhaust gas from the internal combustion engine is flowable through the exhaust gas after-treatment unit.

### Claim 12 (depends on 11)

A method for operating the drive mechanism according to claim 11, wherein an exhaust gas temperature raise is effected by at least one internal measure relative to the internal combustion engine.