Exhaust-gas catalyst with reduced tendency to store sulfur oxides and to emit hydrogen sulfide and process for preparing the catalyst

US4963521A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Bernd Engler · Hanau, DE
• Edgar Koberstein · Alzenau, DE
• Egbert Lox · Hanau, DE

Key dates

• Filing date: May 1, 1989
• Grant date: Oct 16, 1990
• Expiry date: May 1, 2009

Classification

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

Abstract

A catalyst for purifying the exhaust gases of internal combustion engines by means of oxidation and reduction with a reduced tendency to store sulfur oxides and to emit H.sub.2 S contains active Al.sub.2 O.sub.3 as carrier which is charged with CeO.sub.2 and optionally with ZrO.sub.2 as well as with platinum, and/or palladium, and optionally rhodium and also contains in addition 0.7 to 20% by weight B.sub.2 O.sub.3 relative to Al.sub.2 O.sub.3.