Process for the selective catalytic reduction of the nitrogen oxides contained in a lean exhaust gas

US6334986B1 · kind B1 · utility

Assignee

• Degussa AG · DE

Inventors

• Jurgen Gieshoff · Bad Orb, DE
• Hans Van Den Tillaart · Alzenau, DE
• Thomas Kreuzer · Karben, DE
• Egbert Lox · Hanau, DE
• Jurgen Lang · Ludwigsburg, DE

Key dates

• Filing date: Jan 11, 2001
• Grant date: Jan 1, 2002
• Expiry date: Jan 11, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S423/10
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The invention relates to a process for the selective catalytic reduction of the nitrogen oxides contained in a lean exhaust gas from internal combustion engines by reducing the nitrogen oxides by means of ammonia on a catalyst. The process is characterized in that, in addition to the lean exhaust gas, a rich gas stream is produced that is treated in an electrical gas discharge plasma in order to form the ammonia required for the reduction.