Umicore Ag & Co Kg

Degussa Aktiengesellschaft

Degussa - Huls Ag

Dmc2 Degussa Metals Catalysts Cerdec Ag

Dmc2 Degussa Metal Catalysts Cerdec Ag

Other

Dmc, Inc

Umicore Galvanotechnik Gmbh

Degussa-h{umlaut Over (u)}ls Aktiengesellschaft

Degussa-huls-aktiengesellshaft

Degussa Aktiengesellscaft

Dmc2 Degussa Metals

Degussa-huls Aktiengesellschraft

Dmc2 Degussa Metals Catalysts Cerdac Ag

Egbert Lox

Thomas Kreuzer

Rainer Domesle

Dieter Lindner

Lothar Mussmann

Bernd Engler

Martin Votsmeier

Marcus Pfeifer

Wolfgang Strehlau

Jürgen Gieshoff

Yvonne Demel

Edgar Koberstein

Paul Spurk

Harald Klein

Ulrich G&ouml;bel

J&uuml;rgen Gieshoff

Michael Harris

Klaus Ostgathe

J&uuml;rgen Leyrer

Renee Van Yperen

Hans Van Den Tillaart

Matthias Feger

Tobias Kuhl

Jurgen Leyrer

Stephan Eckhoff

Mamoun Muhammed

Stephan Malmberg

Herbert Voelker

Dieter Detterbeck

Lutz Marc Ruwisch

Adolf Schäfer-Sindlinger

Barry Van Setten

Wilfried Muller

Wilfried M&uuml;ller

Juergen Leyrer

Peter Kattwinkel

Roger Staab

Tassilo Bog

Ulrich Neuhausen

Martin Roesch

Carsten Plog

Nicola Soeger

Frank-Walter Schuetze

Thomas Stengel

Markus Koegel

Renato Andorf

J&uuml;rgen Lang

Norbert Markert

Anke Wolf

Frank-Walter Schütze

Oliver Fehnle

Friedemann Rohr

Martin Votsmeir

Hans Van Tillaart

Walter Leibold

Wolfgang Kuhl

Andreas Niemann-Weber

Pascal Adolph

Frank Schütze

Jurgen Hohne

Othon Adamopoulos

Jurgen H&ouml;hne

Adolf Sch&auml;fer-Sindlinger

Barry Van Stetten

Christian Kühn

Joerg Michael Richter

Jorg-Michael Richter

Jürgen Geishoff

Barbara Diehl

Helga Vollmer

Stefan D Peter

Markus Pfeifer

Othan Adamopoulos

Harald Krieg

Disclosed is a method and a corresponding apparatus for coating open-pored bodies with at least one coating suspension, the coating suspension having solids and solutes in a liquid medium in a quantity in wet state which is to correspond to at least a required target quantity, and the coating operation having a variation in the applied wet coating quantity from one body to the other. The method includes steps of: coating the body with an actual quantity of the coating suspension, which is always larger than the required target quantity taking the variation of the coating operation into account, determining the difference between the actual quantity and the required target quantity, and reducing the difference between actual quantity and target quantity by removing still wet coating suspension.

Method and apparatus for coating a carrier

This invention relates to a method and a corresponding apparatus for coating open-pored bodies with at least one coating suspension. In particular, the coating suspension has solids and solutes in a liquid medium in a quantity in wet state which is to correspond to at least a required target quantity. The coating operation has a variation in the applied wet coating quantity from one body to the other. The method according to the invention is characterized by the steps of: coating the body with an actual quantity of the coating suspension, which is always larger than the required target quantity taking the variation of the coating operation into account, determining the difference between the actual quantity and the required target quantity, and reducing the difference between actual quantity and target quantity by removing still wet coating suspension.

The present invention describes an exhaust-gas purification system for an internal combustion engine made of an oxidation catalyst arranged close to the engine, a subsequent hydrocarbon adsorber and a particulate filter arranged downstream thereof and provided with another oxidation catalyst. The oxidation catalyst ensures that emission limits with respect to carbon monoxide and hydrocarbons are satisfied in normal driving mode. During operating states with exhaust-gas temperatures below about 200&#xb0; C., the oxidation catalyst can no longer oxidize carbon monoxide and hydrocarbons. Instead, the hydrocarbons are adsorbed by the hydrocarbon adsorber during these operating phases. In order to initiate the periodical regeneration of the particulate filter, the exhaustgas temperature of the internal combustion engine is raised by engine modifications. The increased exhaust-gas temperature leads to desorption of the previously stored hydrocarbons, which are then burned at the oxidation catalyst of the particulate filter, thereby supporting the regeneration of the particulate filter.

Exhaust-gas purification system with particulate filter and method of operation thereof with improved regeneration of the particulate filter

The invention proposes a particulate filter having a catalytic coating which contains two catalysts arranged one behind the other. The first catalyst is located in the gas inlet region of the filter and contains a palladium/platinum catalyst. The second catalyst is arranged downstream of the first catalyst and preferably contains platinum alone as catalytically active component. The combination of these two catalysts provides the coated filter with a good ageing stability and resistance to sulphur poisoning.

Catalytically coated particle filter and method for producing the same and its use

The present invention relates to an exhaust gas cleaning catalyst comprising on a honeycomb carrier a catalytic coating. Said honeycomb carrier has an upstream end and a downstream end and a plurality of flow channels are running from the upstream end to the downstream end. The catalytic coating comprises catalytically active precious metal components of which at least one component exhibits a concentration profile along the honeycomb carrier starting with a low concentration at the upstream end which increases along the flow channels up to a maximum value and then decreases again to the downstream end.

Exhaust gas cleaning catalyst with an axially varying precious metal concentration and processes for making the catalyst

The invention relates to a process for the coating of a catalyst support with a catalytically active coat using a coating dispersion, the catalyst support containing at least two partial structures which differ in their absorptivity for the coating dispersion. The process is characterized in that the absorptivity of the partial structures is modified relative to one another by precoating of the catalyst support with a material which can be burnt out or with liquid, and the catalytic coat is then applied to the filter body in a known manner, dried and/or calcined.

Method for coating a catalyst carrier containing two different partial structures with a catalytically active coating, and catalyst obtained thereby

The invention relates to a catalyst arrangement for purifying the exhaust gases of internal combustion engines operated under lean conditions. It is proposed that a thinwalled, porous carrier be coated on one side with a nitrogen oxide storage catalyst and on the other side with an SCR catalyst. When the exhaust gas is passed through the catalytic coatings and the support material, a significant improvement in the nitrogen oxide conversion is achieved compared to a series arrangement of the catalysts on separate carriers. Wall flow filters have been found to be useful as thin-walled carriers.

Catalyst arrangement and method of purifying the exhaust gas of internal combustion engines operated under lean conditions

This invention relates to a method of operating a catalyst for treating the exhaust gas of an internal combustion engine, the catalyst comprising, in addition to catalytically active noble metals, also storage components for storing hydrocarbons. During engine operating phases at low exhaust-gas temperatures, such a catalyst stores the hydrocarbons contained in the exhaust gas without burning them. When the exhaust-gas temperature rises, these hydrocarbons are desorbed again and then oxidized at the catalytically active noble metals. This process can lead to uncontrolled, vigorous combustion of the hydrocarbons stored on the catalyst and, therefore, damage to the catalyst. According to the invention, this damage is avoided by continuously calculating the respective loading of the storage components with hydrocarbons and repeatedly regenerating the storage components depending on the loading by temporarily raising the exhaust-gas temperature before damage to the catalyst can occur.

Method of operating a catalyst which includes components for storing hydrocarbons

The present invention relates to a catalyst for the purification of exhaust gases from an internal combustion engine, which comprises a catalytically active coating on an inert ceramic or metal honeycomb body, said coating comprising at least one platinum group metal selected from the group consisting of platinum, palladium, rhodium and iridium on a fine, oxidic support material. As an oxidic support material, the catalyst comprises a low-porosity material on the basis of silicon dioxide that comprises aggregates of essentially spherical primary particles having an average particle diameter of between 7 and 60 nm.

Catalyst featuring silicone dioxide based support material for the purification of exhaust gases

An oxygen storage material comprising cerium oxide and at least one second oxide of a metal Mis disclosed as well as a process for manufacturing the material and the use of this material in an exhaust gas cleaning catalyst. In a preferred embodiment the oxygen storage material comprises particles from a Ce/Mmixed oxide solid solution coated with an oxide of another metal M. Metal Me.g. can be calcium or zirconium while metal Mmost preferably is aluminum.

Oxygen storage material, process for its preparation and its application in a catalyst

An exhaust gas treatment unit for the selective catalytic reduction of nitrogen oxides under lean exhaust gas conditions which contains at least one catalyst with catalytically active components for selective catalytic reduction (SCR components). The exhaust gas treatment unit is characterised in that the catalyst also contains, in addition to SCR components, at least one storage component for nitrogen oxides (NOx components).

Exhaust gas treatment unit for the selective catalytic reduction of nitrogen oxides under lean exhaust gas conditions and a process for the treatment of exhaust gases

The present invention is directed to a particle filter to remove soot from the exhaust gas of a diesel engine. The particle filter contains a catalytically active coating on a filter body to accelerate bum-off during a regeneration phase of the soot particles collected on the filter. The particle filter comprises a catalytic coating containing compounds of barium, compounds of magnesium, and at least one element of the platinum group metals. The invention is further directed to a process for accelerated combustion of soot particles collected on the filter from lean exhaust gas of a diesel engine in which the soot particles have a soot ignition temperature and the particle filter is actively regenerated from time to time by raising the temperature of the particle filter above the soot ignition temperature and burning off the soot particles.

Particle filter having a catalytically active coating to accelerate burning off accumulated soot particles during a regeneration phase

The present invention provides a process and a device for regeneration of a nitrogen oxide storage catalyst in the exhaust system of a diesel engine. The process comprises a first and a second regeneration strategy. The first regeneration strategy is applied when the exhaust gas temperature is above a threshold value and comprises changing the air/fuel-ratio from a lean to a rich value during a first regeneration period. The second regeneration strategy is applied when the exhaust gas temperature is below a threshold value and comprises switching the air/fuel-ratio back and forth between lean and rich air/fuel-ratios, forming a sequence of between 2 and 10 rich pulses and between 2 and 10 lean pulses during a second regeneration period.

Process for regenerating a nitrogen oxides storage catalyst

The present invention relates to a method of removing nitrogen oxides from the exhaust gas of a lean-burn internal combustion engine by selective catalytic reduction (SCR) using ammonia. The exhaust gas is routed first over a platinum-containing pre-catalyst and then over an SCR catalyst. The ammonia needed for the selective catalytic reduction is added to the exhaust gas upstream of the pre-catalyst at an exhaust-gas temperature below 250&#xb0; C., while it is supplied to the exhaust gas between the pre-catalyst and the SCR catalyst at an exhaust gas temperature above 150&#xb0; C. By adopting this procedure, a very large temperature range for the selective catalytic reduction with high nitrogen conversion rates is obtained.

Method of removing nitrogen oxides from the exhaust gas of a lean-burn internal combustion engine and exhaust-gas purification system therefor

The invention relates to a method and an apparatus of operating a drive system comprising an engine and an exhaust gas purification unit containing a catalyst, where the engine emits an exhaust gas having an exhaust gas temperature and the catalyst has a catalytic activity for the purification of the exhaust gas. In the method, an aging-induced decrease in the catalytic activity of the catalyst is compensated at least part of the time by increasing the exhaust gas temperature of the engine.

Method of operating a system comprising a diesel engine and catalyst for exhaust gas purification

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Hochwaldhausen, Germany

Egbert Lox