Patent · US Expired

Catalyst and method for its manufacture

US5055440A · kind A · utility

10Cited by

3References

4Claims

0Family size

Assignee

Asea Brown Boveri, S.A. · CH

Inventors

Wing F. Chu · Frankfurt am Main, DE
Franz-Josef Rohr · Weinheim, DE
Andreas Reich · Buxheim, DE

Key dates

Filing date	Oct 10, 1989
Grant date	Oct 8, 1991
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 is used for removing toxic substances from the exhaust gases of combustion installations and internal combustion engines, by reduction with carbon monoxide, hydrogen, hydrocarbons or ammonia. The catalyst is produced using a single-phase or multi-phase mixed oxide system with a pure perovskite structure or a perovskite and spinel structure. To produce the catalyst, carbonates or oxides of lanthanum, strontium, manganese, iron and copper are mixed, crushed, dried and ground to a fine powder with a particle size between 0.1 and 5 microns. This powder is then processed to form a catalytically active layer.

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