Process of manufacturing a catalyst for purifying the exhaust gases from internal combustion engines and catalyst prepared by the process

US4624941A · kind A · utility

Assignee

• Doduco Kg. Dr. Eugen Durrwachter · DE

Inventors

• Malte Berndt · Lübeck, DE
• Dieter Ksinsik · Sinsheim, DE

Key dates

• Filing date: Sep 30, 1985
• Grant date: Nov 25, 1986
• Expiry date: Sep 30, 2005

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/12
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

To manufacture a catalyst for purifying the exhaust gases from internal combustion engines, which catalyst comprises a skeleton comprising sintered alumina and at least one stabilizing rare earth element oxide and is preferably provided as a coating on a metallic, mineral or ceramic support, and which catalyst comprises at least one noble metal, which is finely dispersed on said skeleton, a solution is provided, which contains at least one noble metal salt and at least one salt of at least one rare earth element and optionally also an aluminum salt. Said solution is subjected to spray pyrolysis in contact with oxygen to produce a composite powder consisting of at least one noble metal, at least one rare earth element oxide and, if desired, alumina. Said composite powder is applied and sintered to a surface layer of the alumina skeleton.