# US 8,539,758 B2 · Exhaust-gas purification system for diesel engines > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,539,758 B2 - Document ID: US8539758B2 - Status: Granted - Kind: B2 - Application number: 13/070,822 - Filed: 2011-03-24 - Published: 2011-09-15 - Granted: 2013-09-24 - Earliest claimed: 2008-09-24 - Assignees: EMITEC Gesellschaft fuer Emissionstechnologie mbH - Applicants: Klaus Müller-Haas - Inventors: Klaus Müller-Haas - Web page: https://patentgrep.com/patent/US8539758B2 ## CPC - F01N 3/035: with catalytic reactors - F01N 3/2066: {Selective catalytic reduction [SCR]} - F01N 3/2839: {Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration} - F01N 13/0097: {the purifying devices are arranged in a single housing} - F01N 3/0231: {using special exhaust apparatus upstream of the filter for producing nitrogen dioxide, e.g. for continuous filter regeneration systems [CRT]} - F01N 2240/16: an electric heater, i.e. a resistance heater - F01N 2240/40: a hydrolysis catalyst - F01N 2470/18: the axis of inlet or outlet tubes being other than the longitudinal axis of apparatus - F01N 2470/24: Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled - F01N 2490/06: the gases flowing longitudinally from inlet to outlet in opposite directions - F01N 2610/02: the substance being ammonia or urea - 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) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract An exhaust gas purification system for diesel engines includes at least one oxidation catalytic converter, a reducing agent injection device and a reduction catalytic converter disposed together in a housing having a first lateral chamber close to a first end side and a second lateral chamber close to a second end side. The reduction catalytic converter is disposed in the first lateral chamber, the oxidation catalytic converter is disposed in an outer annular space of the second lateral chamber and the reducing agent injection device is oriented toward an inner channel of the outer annular space of the second lateral chamber. A flow path for the exhaust gas from at least one exhaust gas inlet toward at least one exhaust gas outlet is provided through the oxidation catalytic converter, the reducing agent injection device and the reduction catalytic converter. ## Claims ### Claim 1 An exhaust-gas purification system for diesel engines, the exhaust-gas purification system comprising: a housing having a first end side, a second end side, a first lateral chamber in vicinity of said first end side and a second lateral chamber in vicinity of said second end side, said second lateral chamber having an outer annular space with an inner channel; at least one exhaust-gas inlet leading into said housing and at least one exhaust-gas outlet leading out of said housing; a reduction catalytic converter disposed in said first lateral chamber of said housing; at least one oxidation catalytic converter disposed in said outer annular space of said second lateral chamber of said housing; a reducing agent injection device disposed in said housing and directed toward said inner channel of said outer annular space of said second lateral chamber; at least one soot particle separator disposed in said inner channel; and a flow path for the exhaust gas from said at least one exhaust-gas inlet to said at least one exhaust-gas outlet passing successively through said at least one oxidation catalytic converter, said reducing agent injection device, said at least one soot particle separator, and said reduction catalytic converter. ### Claim 2 (depends on 1) The exhaust-gas purification system according to claim 1, which further comprises at least one mixing element disposed in said channel. ### Claim 3 (depends on 1) The exhaust-gas purification system according to claim 1, which further comprises at least one hydrolysis catalytic converter disposed in said channel. ### Claim 4 (depends on 1) The exhaust-gas purification system according to claim 1, wherein said at least one exhaust-gas outlet is disposed between said reduction catalytic converter and said first end side of said housing. ### Claim 5 (depends on 1) The exhaust-gas purification system according to claim 1, wherein said reducing agent injection device is directed toward said at least one oxidation catalytic converter. ### Claim 6 (depends on 5) The exhaust-gas purification system according to claim 5, wherein said oxidation catalytic converter has a rear wall, a hydrolysis coating at least partially provided in a region of said rear wall, said reducing agent injecting device for directing the metered reducing agent onto said hydrolysis coating. ### Claim 7 (depends on 1) The exhaust-gas purification system according to claim 1, which further comprises a partition spacing said first lateral chamber and said second lateral chamber apart from each other, said partition having a pipe forming said channel. ### Claim 8 (depends on 7) The exhaust-gas purification system according to claim 7, wherein said pipe defines said annular outer space and serves as a support for said oxidation catalytic converter. ### Claim 9 (depends on 1) The exhaust-gas purification system according to claim 1, which further comprises an electric heater disposed at least upstream of said at least one oxidation catalytic converter. ### Claim 10 (depends on 1) The exhaust-gas purification system according to claim 1, which further comprises an electric heater disposed at least upstream of said hydrolysis catalytic converter. ### Claim 11 (depends on 1) The exhaust-gas purification system according to claim 1, wherein said oxidation catalytic converter has an uncoated rear wall and said reducing agent injecting device is directed toward said uncoated rear wall of oxidation catalytic converter. ### Claim 12 (depends on 1) The exhaust-gas purification system according to claim 1, wherein said soot particle separator and/or said reducing agent catalytic converter are provided with structured carrier elements which define channels, and structures of said structured carrier elements have microstructures which define openings and flow-guiding surfaces which are aligned to conduct partial flows of the exhaust gases along said carrier elements from inside to outside and/or vice versa.