Gasoline particulate filters with high initial filtering efficiency and methods of making same
AssigneeAfton Chemical Corporation
InventorsHuifang Shao, Joseph W. Roos, Joseph E. Remias
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Abstract
Gasoline Direct Injection (GDI) engines require gasoline particulate filters (GPFs) as a key component of the emissions control system to reduce particulate emissions. GPFs are known to have poor initial performance, with performance increasing after the filter develops a cake. This poor initial performance make it impossible to accurately assess vehicle emissions performance at the mileage requirements for vehicle certification. Compositions and methods are disclosed to improve filtration efficiency in a fresh or low mileage GPF.
Claims20
A gasoline particulate filter comprising:
- a pre-service gasoline particulate filter comprising pores,
- wherein the pores are at least partially filled with a particulate substance.
A method of pretreating a gasoline particulate filter, comprising:
- contacting the gasoline particulate filter comprising pores with a particulate substance prior to installing the gasoline particulate filter in a vehicle to produce a pre-treated gasoline particulate filter, wherein the pores are at least partially filled with the particulate substance.
A method of increasing an initial in-service filtration efficiency of a gasoline particulate filter, comprising:
- contacting a newly installed gasoline particulate filter with an exhaust stream comprising particulate matter derived from a priming composition.
Dependencies are inferred from the claim text.