Amy Leigh Berris

US Patent:

7021049, Apr 4, 2006

Filed:

Nov 22, 2002

Appl. No.:

10/301939

Inventors:

Amy Berris - Royal Oak MI, US
Jun (John) Li - Canton MI, US
Mohinder Singh Chattha - Northville MI, US
William Lewis Henderson Watkins - Toledo OH, US

Assignee:

Ford Global Technologies, LLC - Dearborn MI

International Classification:

F01N 3/00
F01N 3/10
B01J 20/04
B01J 20/08
B01J 20/30

US Classification:

60295, 60285, 60301, 42324407, 502415, 502517

Abstract:

An automobile exhaust system includes a catalytic converter, a NOx trap, and a sulfur oxide trap. The sulfur oxide trap improves the efficiency of the NOx trap. Sulfur oxide has a deleterious effect on the performance of nitrogen oxide traps. The sulfur oxide trap comprises a monolithic substrate which is over-coated with an aluminum oxide layer and a mixed oxide layer of calcium oxide and magnesium oxide. In a variation, a sulfur oxide trap is integrated with a nitrogen oxide trap by coating the catalyst contained within a nitrogen oxide trap with a mixed oxide layer of calcium oxide and magnesium oxide. In each embodiment, the sulfur oxide trap can be regenerated by heating at elevated temperature for a short time period.

US Patent:

7199078, Apr 3, 2007

Filed:

Jan 24, 2006

Appl. No.:

11/275686

Inventors:

Amy Berris - Royal Oak MI, US
Jun Li - Canton MI, US
Mohinder Singh Chattha - Northville MI, US
William Lewis Henderson Watkins - Toledo OH, US

Assignee:

Ford Global Technologies, LLC - Dearborn MI

International Classification:

B01J 23/58
B01J 23/02
B01J 23/06
B01D 53/50
B01D 53/56

US Classification:

502328, 502340, 42324407, 4232132, 4232391

Abstract:

An automobile exhaust system includes a catalytic converter and a modified NOx trap wit improved sulfur tolerance. Sulfur oxide has a deleterious effect on the performance of nitrogen oxide traps. In the modified NOx trap, a sulfur oxide trap is integrated with a nitrogen oxide trap by coating the catalyst contained within a nitrogen oxide trap with a mixed oxide layer of calcium oxide and magnesium oxide. The NOx trap is regenerated by heating at elevated temperature for a short time period.