Patent · US Expired

Catalyst and method for its manufacture

US5093301A · kind A · utility

20Cited by

5References

3Claims

0Family size

Assignee

Asea Brown Boveri, S.A. · CH

Inventors

Wing F. Chu · Frankfurt am Main, DE
Franz-Josef Rohr · Weinheim, DE
Norbert Pfeifer · Arpajon, FR

Key dates

Filing date	Oct 10, 1989
Grant date	Mar 3, 1992
Priority date	—
Expiry date	Oct 10, 2009

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S502/525
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A catalyst for the elimination of toxic substances in exhaust gases from combustion systems and internal combustion engines, having at least one layer of catalyst material, includes a catalyst material formed by at least one mixed oxide system, which has unsaturated ions on its surface that effect charge transfer processes. A method for manufacturing such a catalyst includes grinding dry carbonates or oxides of lanthanum, manganese, iron, copper and strontium in a defined ratio by weight for at least one hour, and sintering the powder mixture thus formed at 1300.degree. C. for forming the perovskite structure or the perovskite and spinel structure.

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