Patent · US Expired

Catalyst for purifying the exhaust gases of internal combustion engines and method for making the catalyst

US5179059A · kind A · utility

31Cited by

3References

24Claims

0Family size

Assignee

Degussa AG · DE

Inventors

Rainer Domesle · Alzenau, DE
Bernd Engler · Hanau, DE
Felix Schmidt · Baldegg, CH
Peter J. Schubert · Carmel, US
Edgar Koberstein · Alzenau, DE

Key dates

Filing date	Jan 31, 1991
Grant date	Jan 12, 1993
Priority date	—
Expiry date	Jan 31, 2011

Classification

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

Abstract

A catalyst for purifying the exhaust gases of internal combustion engines with improved light-off behavior and improved durability with reduced specific noble-metal content is disclosed which uses active aluminum oxide provided with customary promoters as carrier and platinum and/or palladium and rhodium in customary amounts as noble metals. In addition, it contains one or more base metals in amounts up to 5 times the mass of the total noble metal which are brought into the immediate vicinity of the rhodium by means of a special manufacturing technique.

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