Oxidative diesel control catalyst

US5371056A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Juergen Leyrer · Alzenau, DE
• Egbert Lox · Hanau, DE
• Bernd Engler · Hanau, DE
• Rainer Domesle · Alzenau, DE

Key dates

• Filing date: Apr 20, 1993
• Grant date: Dec 6, 1994
• Expiry date: Apr 20, 2013

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02A50/20
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

An oxidative diesel control catalyst is disclosed which has a high conversion rate for hydrocarbons and carbon monoxide and an inhibited oxidation effect on nitrogen oxides and sulfur dioxides and which contains a monolithic catalyst element with throughflow passages of ceramic or metal coated with an activity-promoting dispersion coating of the fine-particle metal oxides aluminum oxide, titanium oxide, silicon oxide, zeolite or mixtures thereof as support of the catalytically active components, the active components being present in the form of platinum, palladium, rhodium and/or iridium doped with vanadium or in contact with an oxidic vanadium compound. The reduced oxidation effect on sulfur dioxide is obtained by virtue of the fact that the fine-particle metal oxides are surface-modified aluminum oxide, titanium oxide, silicon oxide, zeolite or mixtures thereof. The surface modification is a coating of the specific surface of the metal oxides with a layer of titanium dioxide or silicon dioxide of 1 to 5 monolayers.