Patent · US Active

Engine exhaust catalysts containing palladium-gold

US7709414B2 · kind B2 · utility

79Cited by

47References

17Claims

0Family size

Assignee

NANOSTELLAR, INC. · US

Inventors

Kyle L. Fujdala · San Jose, US
Timothy J. Truex · Oxnard, US
Jifei Jia · Hercules, US

Key dates

Filing date	Jan 17, 2007
Grant date	May 4, 2010
Priority date	—
Expiry date	Feb 17, 2028

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/24149
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

An engine exhaust catalyst exhibits improved CO oxidation performance relative to conventional engine exhaust catalysts and includes a first supported catalyst comprising platinum and a second supported catalyst comprising palladium and gold species in close contact. The first supported catalyst may be a platinum catalyst, a platinum—palladium catalyst, or a platinum catalyst promoted with bismuth, and the second supported catalyst preferably has a palladium to gold weight ratio of about 0.85:1.0. To improve aged catalyst performance, the first and second supported catalysts are coated onto different layers, zones, or monoliths of the substrate for the engine exhaust catalyst.

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