Umicore Ag & Co Kg

Sap Ag

Umicore Galvanotechnik Gmbh

Marcus Pfeifer

Thomas Kreuzer

Paul Spurk

Egbert Lox

Gerald Jeske

Markus Koegel

Michael Schiffer

Yvonne Demel

Nicola Soeger

Franz Dornhaus

Jürgen Gieshoff

Wolfgang Schneider

Frank-Walter Schuetze

Katja Adelmann

Lothar Mussmann

Anke Schuler

Kenneth Price

Bernhard Brinkmoeller

Adolf Schäfer-Sindlinger

Carola Steinmaier

Tobias Kuhl

Hendrik-David Noack

Roger Staab

Frank-Walter Schütze

Stephan Basso

Egbert S J Lox

Martin Votsmeier

Axel Herbst

Ulrich Goebel

Stephan Malmberg

Ruediger Hoyer

Christoph Hengst

Michael Seyler

Stéphanie Frantz

Lutz Marc Ruwisch

Barry Van Setten

Christopher Simon Owens

Markus Kögel

Peter Kattwinkel

Bernard Brinkmöller

Pascal Adolph

Martin Symalla

Jürgen Geishoff

Christian Kühn

Barry Van Stetten

Frank Walter Schuetze

Alain Ristori

Matthias Duisberg

Ralf Mueller

Nicola Söger

Kenneth Sherwood Price

Egbert SJ Lox

Harald Krieg

The present invention is directed towards the use of an ion-exchanged zeolite containing ASC as a trap for volatile vanadium compounds in a downstream position of a vanadium containing SCR-catalyst.

Vanadium trapping SCR system

A particle filter for treating exhaust gases includes an SCR catalyst that, when in the presence of a reductant such as ammonia, promotes selective catalytic reduction of NO; an active oxidation catalyst that promotes oxidation of hydrocarbons and carbon monoxide; and an oxygen storage catalyst that alternately stores and releases oxygen, enhances soot oxidation, and stores NOx at temperatures below optimal SCR functioning. The particle filter may be included in a system having an oxidation catalytic device (OCD) upstream of the particle filter, and optionally includes one or more SCR converters upstream and/or downstream of the particle filter, and/or an ammonia slip catalyst downstream of the particle filter. The system may further be adapted for operation under a high frequency injection fuel control with an OCD having substantial NOx storage material content, or an NSC for improving the efficiency tradeoffs between soot oxidation during filter regeneration and NOreduction.

SCR diesel particle filter with oxidation catalyst and oxygen storage catalyst loadings, and exhaust system including the same

The present invention relates to a SCR catalyst comprising a carrier substrate of the length L, which is a flow-through substrate, and a coating A which comprises a small pore zeolite, copper and palladium.

SCR catalyst and exhaust gas cleaning system

The invention proposes a method for the purification of exhaust gases which are generated by a diesel engine with a charging turbine, and a special device for carrying out said method. The device comprises, in the flow direction of the exhaust gas, a dosing device for a reducing agent from a reducing agent reservoir (), an SCR catalytic converter (), an oxidation catalytic converter () and a diesel particle filter (). The system is particularly suitable for the purification of the exhaust gases of diesel vehicles in which engines with a turbocharger (charging turbine ()) and an exhaust-gas recirculation device are used, which engines generate exhaust gases which, in addition to carbon monoxide, hydrocarbons and particles, have nitrogen oxides with an NO/NOratio of between 0.3 and 0.7.

Method and device for the purification of diesel exhaust gases

The present invention relates to a catalyst system for treatment of diesel exhaust gas, comprising, in flow direction of the exhaust gas,

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The invention relates to a method for preventing the contamination by platinum of an SCR catalyst in an exhaust-gas treatment system, said system comprising an oxidation catalyst containing platinum on the inflow side of the SCR catalyst. The outflow side of the oxidation catalyst comprises a material zone which removes traces of platinum contained in the exhaust-gas stream.

Method for preventing the contamination by platinum of an SCR catalyst

The present invention relates to a diesel particle filter which has a coating active in oxidation catalysis and which is characterized in that said diesel particle filter comprises a material zone which removes platinum traces contained in the exhaust-gas flow, and to the use of said diesel particle filter in the purification of exhaust gases of diesel engines.

Coated diesel particle filter

An SCR-catalytically active diesel particle filter having a ceramic wall flow filter substrate with inflow channels, outflow channels, walls separating the inflow and outflow channels, and two coatings. The first coating is applied in inflow channels, is composed of high-melting point materials, and closes the inflow sides of pores in walls connecting the inflow channels and outflow channels to soot particles without preventing passage of gaseous exhaust gas constituents. The second coating is within the walls between inflow channels and outflow channels, and effectively catalyzes the selective reduction of nitrogen oxides when in the presence of a reducing agent. The particle filter displays excellent banking-up pressure properties combined with high filtration efficiency and good regeneration properties; and displays good aging stability of NOx conversion activity.

Reduction-catalyst-coated diesel particle filter having improved characteristics

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

Selective catalytic reduction with ammonia or a compound that decomposes to ammonia is a known method for the removal of nitrogen oxides from the exhaust gas of primarily lean-burn internal combustion engines. The vanadium-containing SCR catalysts that have long been generally used for this are characterized by a good conversion profile. However, the volatility of vanadium oxide can, at higher exhaust gas temperatures, lead to the emission of toxic vanadium compounds. Zeolite-based SCR catalysts, which are used in particular in discontinuous SCR systems, constitute a very cost-intensive solution for the problem. A method is proposed by which a homogeneous cerium-zirconium mixed oxide is activated for the SCR reaction in a defined manner by the introduction of sulphur and/or transition metal. Using this method, a highly active, ageing-resistant SCR catalyst is provided, which represents a vanadium-free, cost-effective and high-performance alternative to the existing SCR catalysts and is suitable in particular for use in motor vehicles.

Vanadium-free catalyst for selective catalytic reduction and process for it's preparation

To equip a diesel particle filter with a zeolite-containing coating uniformly over the entire length of the particle filter and with a further zeolite-free coating which is applied, from the entry side of the filter, solely up to a specific length of the filter, it is proposed, first, to apply the zeolite-free coating from the entry side of the filter and only thereafter to apply the zeolite-containing coating over the entire length of the filter from the exit side of the filter. As a result of this sequence of coatings, a better adhesive strength of the coatings than when both coatings are applied from the entry side is ensured.

Method for the coating of a diesel particle filter and diesel particle filter produced thereby

Method for catalytically coating ceramic honeycomb bodies

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

Growing community of inventors

Solingen, Germany

Marcus Pfeifer