Method and device for introducing a gaseous reducing agent of a nitrogen oxide into a gas mixture

US6759021B1 · kind B1 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Thomas Berthold · Munich, DE
• Gabriele Preu · Birkenfeld, DE

Key dates

• Filing date: Oct 30, 2001
• Grant date: Jul 6, 2004
• Expiry date: Oct 30, 2021

Classification

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

Abstract

A method for introducing at least one gaseous reducing agent for a nitrogen oxide into a gas mixture, and a device for carrying out the method. Thermal energy is supplied to a body made from a starting material of the reducing agent, so as to form the reducing agent. The starting material used is urea. The reducing agent formed is ammonia. This method is used in particular to reduce nitrogen oxides in the exhaust gas from internal-combustion engines.