NO.sub.x catalyst and method of suppressing sulfate formation in an exhaust purification system
Patent
·
OSTI ID:909714
- Chillicothe, IL
- Peoria, IL
The activity and durability of a zeolite lean-burn NOx catalyst can be increased by loading metal cations on the outer surface of the zeolite. However, the metal loadings can also oxidize sulfur dioxide to cause sulfate formation in the exhaust. The present invention is a method of suppressing sulfate formation in an exhaust purification system including a NO.sub.x catalyst. The NO.sub.x catalyst includes a zeolite loaded with at least one metal. The metal is selected from among an alkali metal, an alkaline earth metal, a lanthanide metal, a noble metal, and a transition metal. In order to suppress sulfate formation, at least a portion of the loaded metal is complexed with at least one of sulfate, phosphate, and carbonate.
- Research Organization:
- Caterpillar Inc. (Peoria, IL)
- Sponsoring Organization:
- United States Department of Energy
- DOE Contract Number:
- FC05-97OR22579
- Assignee:
- Caterpillar Inc. (Peoria, IL)
- Patent Number(s):
- 7,235,221
- Application Number:
- 11/474,584
- OSTI ID:
- 909714
- Country of Publication:
- United States
- Language:
- English
Similar Records
NO.sub.x catalyst and method of suppressing sulfate formation in an exhaust purification system
Exhaust gas purification system for lean burn engine
Method for treating engine exhaust by use of hydrothermally stable, low-temperature NO.sub.x reduction NH3-SCR catalysts
Patent
·
Tue Aug 22 00:00:00 EDT 2006
·
OSTI ID:1175883
Exhaust gas purification system for lean burn engine
Patent
·
Mon Feb 18 23:00:00 EST 2002
·
OSTI ID:874239
Method for treating engine exhaust by use of hydrothermally stable, low-temperature NO.sub.x reduction NH3-SCR catalysts
Patent
·
Tue Jul 04 00:00:00 EDT 2017
·
OSTI ID:1368350