Patent · US Active

Engine exhaust catalysts containing zeolite and zeolite mixtures

US7517826B2 · kind B2 · utility

63Cited by
42References
18Claims
0Family size

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Key dates

Filing dateNov 20, 2007
Grant dateApr 14, 2009
Priority date—
Expiry dateNov 20, 2027

Classification

  • Technology area (CPC Y)Emerging Cross-Sectional Technologies
  • CPC primaryY02T10/12
  • WIPO fieldChemical engineering
  • WIPO sectorChemistry

Abstract

A multi-layer emission control catalyst exhibits improved CO and HC reduction performance. The bottom layer includes a supported catalyst comprising platinum and palladium particles or palladium and gold particles. The middle layer includes zeolites. The top layer includes a supported catalyst comprising platinum and palladium particles. The use of zeolite mixture in the middle layer further improves CO and HC reduction performance in comparison with using zeolite of a single type. The use of a supported catalyst comprising palladium and gold particles in the bottom layer further improves CO and HC reduction performance in comparison with using a supported catalyst comprising platinum and palladium particles.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.