Umicore Ag & Co Kg

Degussa - Huls Ag

Degussa Aktiengesellschaft

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

Ibu-tec Advanced Materials Ag

Thomas Kreuzer

Egbert Lox

Dieter Lindner

Marcus Pfeifer

Lothar Mussmann

Martin Votsmeier

Jürgen Gieshoff

Rainer Domesle

Harald Klein

Paul Spurk

Wolfgang Strehlau

Ulrich Goebel

Yvonne Demel

Markus Koegel

Wilfried Mueller

Stephan Eckhoff

Ulrich G&ouml;bel

J&uuml;rgen Gieshoff

Michael Harris

J&uuml;rgen Leyrer

Renee Van Yperen

Nicola Soeger

Gerald Jeske

Adolf Schäfer-Sindlinger

Hans Van Den Tillaart

Stephan Bremm

Christian Manfred Tomanik

Tobias Kuhl

Matthias Feger

Mamoun Muhammed

Katja Adelmann

Stephan Malmberg

Wolfgang Schneider

Dieter Detterbeck

Lutz Marc Ruwisch

Barry Van Setten

Marek Maciejewski

Jurgen Leyrer

Martin Roesch

Carsten Plog

Frank-Walter Schuetze

Thomas Stengel

Alfons Baiker

Ruediger Hoyer

Stéphanie Frantz

Renato Andorf

Klaus Ostgathe

Anke Wolf

J&uuml;rgen Lang

Juliane Kluge

Markus Kögel

Ina Grisstede

Peter Kattwinkel

Michael Hoffmann

Meike Wittrock

Jan-Dierk Grunwaldt

Wilfried M&uuml;ller

Roger Staab

Ulrich Neuhausen

Tassilo Bog

Juergen Gieshoff

Norbert Markert

Hartmut Finkbeiner

Ralf Sesselmann

Egbert S J Lox

Juliane Theis

Wilfried Muller

Frank-Walter Schütze

Friedemann Rohr

Stefan Ambrosius

Jürgen Geishoff

Stefan D Peter

Markus Pfeifer

Martin Votsmeir

Othan Adamopoulos

Nicola Söger

Klaus-Ingo Prieger

Maria Cristina Casapu

Michael Hoffman

Helga Vollmer

Aflons Baiker

Barbara Diehl

Jorg-Michael Richter

Adolf Sch&auml;fer-Sindlinger

Jurgen H&ouml;hne

Jurgen Hohne

Hans Van Tillaart

Pascal Adolph

Frank Walter Schuetze

Frank Schütze

Christina Maria Casapu

Othon Adamopoulos

Barry Van Stetten

Christian Kühn

Susanne Philipp

Markus KÖGEL

Marcus Pfeiffer

Egbert SJ Lox

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 invention relates to a process for coating ceramic honeycomb bodies with a coating suspension containing, in a carrier liquid, catalyst components as solids and/or in dissolved form. The honeycomb bodies have parallel flow channels running through them. The walls of the flow channels generally have an open pore structure. To coat the channel walls and in particular also the interior surfaces of the pores with the coating suspension, it is proposed that the flow channels be temporarily alternately closed and the coating suspension be forced through the open pore structure of the channel walls. The coating is subsequently dried and calcined. To close the flow channels, it is possible to use thermally or chemically decomposable or soluble compositions which are decomposed or dissolved either during calcination or by means of a subsequent chemical treatment. The coated honeycomb bodies are preferably used for the purification of exhaust gases from automobiles.

Catalytically coated ceramic honeycomb bodies

An exhaust gas purification system (method and device) for the treatment of diesel exhaust gases containing nitrogen oxides and hydrocarbons is disclosed, which comprises the addition of ammonia or of a compound decomposable to ammonia into the exhaust gas stream and the subsequent leading of the exhaust gas stream over two successively arranged SCR catalysts with different properties and compositions. Both SCR catalysts are free of vanadium compounds and only the downstream SCR catalyst contains zeolite compounds. The exhaust gas purification system according to the invention is characterized by good 'kick-off' behavior at low temperatures and a simultaneously high conversion performance over a wide temperature range.

Exhaust gas purification system for the treatment of engine exhaust gases by means of SCR catalyst

A stream of exhaust gases from the combustion of hydrocarbon-containing fuels with a variable temperature can be produced by dividing the exhaust gases into two separate part-streams, cooling one part-stream and then combining the two part-streams again. The temperature of the exhaust-gas stream which has been combined again can be set to between the temperature of the combustion of the hydrocarbon-containing fuels and the temperature of the cooled exhaust-gas part-stream by corresponding throttling of the two part-streams before they are brought together again. The exhaust-gas stream produced in this way is preferably used for the defined ageing of automotive exhaust catalysts. In this context, it is particularly advantageous that the change in the temperature of the exhaust-gas stream has no influence on its air/fuel ratio.

Method for producing a stream of hot combustion exhaust gases at a settable temperature, apparatus for carrying out the method and use of the combustion exhaust gases for the targeted ageing of catalysts

Nitrogen oxide storage catalysts are used to remove the nitrogen oxides present in the lean exhaust gas of lean-burn engines. As a result of the stress due to high temperatures in vehicle operation, they are subject to thermal aging processes which affect both the nitrogen oxide storage components and the noble metals present as catalytically active components. The present invention provides a process with which the catalytic activity of a nitrogen oxide storage catalyst which comprises, in addition to platinum as a catalytically active component, basic compounds of strontium and/or barium on a support material comprising cerium oxide, said catalytic activity being lost owing to the thermal aging process, can be at least partly restored. The two-stage process is based on the fact that strontium and/or barium compounds formed during the thermal aging with the support material, which also comprise platinum, are recycled to the catalytically active forms by controlled treatment with specific gas mixtures.

Dual-stage method for the reactivation of thermally aged nitrogen oxide storage catalysts

When a nitrogen oxide storage catalyst is being regenerated, the regeneration may be terminated for example as a result of a premature load change in the engine, which can lead to incomplete emptying of the storage catalyst. The residual filling level which remains in the catalyst following an incomplete regeneration of this nature is used as the starting value for calculation of the filling level during the next storage phase. After incomplete regeneration, the nitrogen oxide conversion rate is initially greater than would be expected, on account of the residual filling level. By taking this increased conversion rate into account when calculating the filling level during the storage phase, it is possible to further improve the accuracy of the calculation.

Method for determining the instant at which a nitrogen oxide storage catalyst is switched from the storage phase to the regeneration phase and for diagnosing the storage properties of this catalyst

To adhere to legal exhaust-gas regulations, the exhaust gases of a lean-burn engine must be freed from soot particles and nitrogen oxides. It is proposed that the cylinders of the lean-burn engine be divided into two groups which discharge their exhaust gases into two associated exhaust lines which each comprise a soot filter and which are merged at an opening-in point into a common exhaust line. The common exhaust line comprises the catalytic converter for the removal of the nitrogen oxides. By regenerating the two soot filters at different times, the exhaust-gas temperature in the common exhaust line is limited to a mean temperature between the exhaust-gas temperature of normal operation and that of regeneration operation, and the catalytic converter for the removal of the nitrogen oxides is preserved.

Method for regenerating soot filters in the exhaust gas system of a lean mix engine, and exhaust gas system therefor

Method for catalytically coating ceramic honeycomb bodies

The invention describes a method for determining the light-off temperature of a catalytic converter on board a vehicle. The aging condition of the catalytic converter is determined by means of the method. To test the catalytic converter, the latter is loaded for example with a CO/HC test pulse. During the combustion of the additional CO and HC on the catalytic converter, an axial temperature profile is generated. The position of the maximum of said temperature profile along the catalytic converter is dependent on the current light-off temperature. The temperature profile travels through the catalytic converter and can be measured at the outlet of the catalytic converter as a time-dependent profile. The original axial temperature profile can be inferred from the time-dependent profile. Using a calculation program, the current light-off temperature of the catalytic converter on the vehicle can be determined. The method has the advantage that the test can take place at exhaust-gas temperatures considerably higher than the light-off temperature. In this way, it is ensured that the test pulse does not lead to increased pollutant emissions.

Method for verifying the aging condition of a catalytic converter on board a vehicle

Modern exhaust-gas purification systems in motor vehicles with a lean-burn engine include a starting catalyst fitted close to the engine and a main catalyst arranged in the underbody region, with both the starting catalyst and the main catalyst being formed by nitrogen oxide storage catalysts. The nitrogen oxide storage catalysts are in each case regenerated by the engine being briefly switched from lean-burn mode to rich-burn mode when the nitrogen oxide concentration in the exhaust gas downstream of the storage catalysts rises above a predetermined value. The starting catalyst is exposed to particularly high temperatures and is therefore prone to faster ageing of its nitrogen oxide storage capacity than the main catalyst. To check the nitrogen oxide storage capacity of the starting catalyst, a regeneration which is due for the catalyst system is selected in such a way in terms of its duration and the extent to which the exhaust gas is enriched that substantially only the starting catalyst is regenerated, whereas the main catalyst is not. In this arrangement, the criterion for terminating this partial regeneration is the breakthrough of rich exhaust gas through the starting catalyst. After the engine has been switched back to lean-burn mode, the time which elapses until the concentration of nitrogen oxides in the exhaust gas downstream of the catalyst requires regeneration again is measured. The measured time is a measure of the remaining nitrogen oxide storage capacity of the starting catalyst.

Method for monitoring the nitrogen oxide storage capacity of a nitrogen oxide storage catalyst used in the form of a primary catalytic converter

A catalytically active diesel particulate filter with ammonia trap action is presented, which, in addition to an oxidation-active coating (), comprises a coating () which is catalytically active in the SCR reaction. By means of this inventive diesel particulate filter, it is possible to make exhaust gas aftertreatment systems for removing nitrogen oxides and particulates from the exhaust gas of lean engines considerably simpler and less expensive.

Catalytic activated diesel particle filter with ammonia trap effect

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

A diesel particulate filter with an oxidation catalyst comprising platinum and palladium deposited thereon is described. Addition of HC storage components to the oxidation catalyst allows the conversion of hydrocarbons and carbon monoxide to be improved significantly.

Catalytically coated diesel particle filter, process for producing it and its use

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Karben, Germany

Thomas Kreuzer