Catalyst for the purification of exhaust gases of internal combustion engines with reduction of hydrogen sulfide emission

US5045521A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

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

Key dates

• Filing date: Sep 5, 1989
• Grant date: Sep 3, 1991
• Expiry date: Sep 5, 2009

Classification

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

Abstract

An oxidizing and/or reducing exhaust gas purification catalyst with a reduced tendency 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 ZrO.sub.2 as well as Pt, Pd and/or Rh and, in addition, 0.1 to 40% by weight ZnO relative to Al.sub.2 O.sub.3.