Process for the manufacture of catalyst members for the reduction of oxides of nitrogen and catalyst members produced thereby

US4935392A · kind A · utility

Assignees

• Didier-Werke AG · DE
• Didier Engineering GmbH · DE

Inventors

• Hartmut Kainer · Wiesbaden, DE
• Bernhard Vedder · Kelkheim, DE
• Daniel Grimm · Schlangenbad, DE
• Wilfried Schnelle · Geseke, DE
• Albert Kleinevoss · Grevesmühlen, DE
• Hans-Eugen Buhler · Königstein, DE
• Klaus Merkel · Essen, DE
• Claus Flockenhaus · Essen, DE
• Karl H. Laue
• Manfred Galow · Essen, DE

Key dates

• Filing date: Mar 29, 1989
• Grant date: Jun 19, 1990
• Expiry date: Mar 29, 2009

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J37/0225
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

This invention relates to a process for the manufacture of catalysts for the reduction of oxides of nitrogen from exhaust gases and in chemical air cleaning processes in which a catalytically active material containing iron ores, chromium ores and/or zeolite is placed in contact with a carrier means having a series of openings; e.g., wire mesh, expanded or perforated metal or any type of grid-like structure to form a catalytic member. The carrier means is etched with an acid etchant before forming the catalytic member or, instead, the catalytic member is etched with an acid etchant. The catalytic member is bonded by a thermal treatment; e.g., drying, tempering and/or fixing. This invention also relates to catalytic members or products produced by the process. This invention proposes the use of pressure bonding to obtain a catalytic member product which has significantly improved catalytic activity, greater mechanical strength and higher resistance to chipping.