The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 06, 2007
Filed:
Dec. 30, 2003
Robert Mccabe, Lathrup Village, MI (US);
Woosang Chun, Plymouth, MI (US);
George Graham, Ann Arbor, MI (US);
Clifford Montreuil, Livonia, MI (US);
Brendan Carberry, Aachen, DE;
Albert Chigapov, Aachen, DE;
Alexei Dubkov, Aachen, DE;
Robert McCabe, Lathrup Village, MI (US);
Woosang Chun, Plymouth, MI (US);
George Graham, Ann Arbor, MI (US);
Clifford Montreuil, Livonia, MI (US);
Brendan Carberry, Aachen, DE;
Albert Chigapov, Aachen, DE;
Alexei Dubkov, Aachen, DE;
Ford Global Technologies, LLC, Dearborn, MI (US);
Abstract
The present invention provides a regenerable catalyst composition suitable for entrapping SO. The composition of the invention comprises a copper oxide having the formula (Cu/(A oxide) where A oxide is SiO, Zr—SiO, AlO, TiO—AlO, ZrOand InOor mixtures thereof. Copper loading may vary from about 10 to 60 mol % and is preferably about 25 mol %. The catalyst composition adsorbs SOas metal sulfate under lean conditions and desorbs accumulated SOas SOunder rich conditions. Such reversible SOtrap are able to operate under conventional NOtrap operating conditions to prevent sulfur poisoning of the NOtrap. Furthermore, these traps may be regenerated under rich conditions at 300-450° C. In another embodiment of the present invention, an irreversible SOtrap capable of collecting SOunder lean conditions is provided. The traps of this embodiment include praseodymia, zirconia-praseodymia and mixed manganese-yttria and mixtures thereof.