SOx trap for diesel and lean-burn gasoline automotive applications

US7291576B2 · kind B2 · utility

Assignee

• Ford Global Technologies, LLC · US

Inventors

• Robert Walter McCabe · Novi, US
• Woosang Chun · Plymouth, US
• George Graham · Ann Arbor, US
• Clifford Norman Montreuil · Dearborn, US
• Brendan Patrick Carberry · Aachen, DE
• Albert Chigapov · Aachen, DE
• Alexei Dubkov · Aachen, DE

Key dates

• Filing date: Dec 30, 2003
• Grant date: Nov 6, 2007
• Expiry date: Feb 23, 2025

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/49345
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The present invention provides a regenerable catalyst composition suitable for entrapping SOx. The composition of the invention comprises a copper oxide having the formula (Cu/(A oxide) where A oxide is SiO2, Zr—SiO2, Al2O3, TiO2—Al2O3, ZrO2 and In2O3 or mixtures thereof. Copper loading may vary from about 10 to 60 mol % and is preferably about 25 mol %. The catalyst composition adsorbs SOx as metal sulfate under lean conditions and desorbs accumulated SOx as SO2 under rich conditions. Such reversible SOx trap are able to operate under conventional NOx trap operating conditions to prevent sulfur poisoning of the NOx trap. Furthermore, these traps may be regenerated under rich conditions at 300-450° C. In another embodiment of the present invention, an irreversible SOx trap capable of collecting SOx under lean conditions is provided. The traps of this embodiment include praseodymia, zirconia-praseodymia and mixed manganese-yttria and mixtures thereof.