Method of removing nitrogen oxides (NO.sub.x) from gases, especially flue gases

US4789531A · kind A · utility

Assignee

• STEAG GmbH · DE

Inventors

• Andreas Eichholtz · Recklinghausen, DE
• Helmut Weiler · Velbert, DE

Key dates

• Filing date: Oct 2, 1987
• Grant date: Dec 6, 1988
• Expiry date: Oct 2, 2007

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D2253/102
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

NO.sub.x is removed from flue gases by contacting same in the presence of active coke/active carbon and a reducing agent, e.g. NH.sub.3, CO or H.sub.2. According to the invention, the adsorbent is precharged with the reducing agent, thereby increasing the surface area over which the adsorbent can react with the flue gas and decreasing the levels of gas-reducing agent which must be used and which may appear in the cleaned gas.