Exhaust gas after-treatment unit for an internal combustion engine

US10287939B2 · kind B2 · utility

Assignee

• Daimler AG · DE

Inventors

• Johannes Bleckmann · Stuttgart, DE
• Claudia Essmann · Stuttgart, DE
• Uwe Gaertner · Winnenden, DE
• Alexander Massner · Eßlingen, DE
• Michael Stiller · Waiblingen, DE

Key dates

• Filing date: Dec 12, 2016
• Grant date: May 14, 2019
• Expiry date: Dec 12, 2036

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/12
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

An exhaust gas after-treatment unit includes a first catalytic converter, a particle filter arranged downstream of the first catalytic converter, and a second catalytic converter arranged downstream of the particle filter and which is a selective catalytic reduction (SCR) catalytic converter. The first catalytic converter is a combination catalytic converter including a first catalytic converter part which is an SCR catalytic converter, a second catalytic converter part arranged downstream of the first catalytic converter part which is an ammonia slip catalytic converter and has a noble metal layer with a first noble metal content, a third catalytic converter part arranged downstream of the second catalytic converter part which is an oxidation catalytic converter and has a noble metal layer with a second noble metal content, and an SCR layer arranged on the noble metal layers and extending over the entire length of the second and third catalytic converter parts.