NO x catalyst and method of suppressing sulfate formation...

Details NO x catalyst and method of suppressing sulfate formation... NO x catalyst and method of suppressing sulfate formation...

2007-06-26

2007-06-26

Langel, Wayne A. (Department: 1754)

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Mixture is exhaust from internal-combustion engine

C423S213200, C423S213500, C423S239200

Reexamination Certificate

active

11474584

ABSTRACT:
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 NOxcatalyst. The NOxcatalyst 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.

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