Umicore Ag & Co Kg

Deutz Aktiengesellschaft

Anke Woerz

Frank-Walter Schuetze

Gerald Jeske

Stéphanie Frantz

Martin Roesch

Martin Votsmeier

Franz Dornhaus

Owen Herman Bailey

Michael Schiffer

Ruediger Hoyer

Wilfried Mueller

Andreas Geisselmann

Rolf Miebach

Stephan Schraml

Peter Broll

Thomas Utschig

Stefan De Buhr

Matthew Hedgecock

Benjamin Betz

Badr Bassou

The present invention relates to a catalyst comprising a carrier substrate of length L and at least two washcoat layers A and B wherein

Catalyst for reducing nitrogen oxides

The present invention relates to the use of a material B containing palladium and platinum in a weight ratio of 2:3 to 10:1 for increasing the low-temperature storage of nitrogen oxides by means of a material A containing palladium and zeolite, wherein material A and material B are present on a carrier substrate of the length L, and wherein material A and material B are different from one another.

Passive nitrogen oxide adsorber having oxidation-catalytically active function

The present invention relates to a catalyst which comprises a carrier substrate of length L, which extends between a first end face a and a second end face b, and catalytically active material zones A, B and C of different composition, wherein&#x2014;material zone A comprises palladium or palladium and platinum with a weight ratio of Pd:Pt&#x3e;1, and cerium oxide, &#x2014;material zone B comprises platinum or platinum and palladium with a weight ratio of Pt:Pd&#x3e;1, and cerium oxide and/or cerium/zirconium mixed oxide, and&#x2014;material zone C comprises platinum or platinum and palladium with a weight ratio of Pt:Pd&#x3e;1, and a carrier oxide, and wherein&#x2014;material zone B is arranged above material zone A, and&#x2014;material zone C is arranged above material zone B, and, starting from the second end face b of the carrier substrate, extends over a length of up to 60% of the length L. The invention also relates to a catalyst arrangement containing said catalyst.

Nitrogen oxide storage catalyst

The present invention relates to a catalytically active material consisting of an inner core () and an outer shell () surrounding this core, the core being formed from palladium and gold fixed together on a first support oxide, and the shell comprising platinum fixed on a second support oxide, to a diesel oxidation catalyst comprising this catalytically active material, and to an exhaust gas cleaning system comprising this diesel oxidation catalyst.

Diesel oxidation catalyst

An exhaust gas post treatment system for an internal combustion engine, including an intake device for taking hydrocarbons into an exhaust gas pipe carrying the exhaust process gas from the internal combustion engine and a treatment device through which exhaust process gas flows downstream of the intake location and which increases the exhaust process gas temperature by oxidation of the hydrocarbons taken in. An exhaust gas post treatment system and a method for operating the same, in that the treatment device has catalytically coated components, the hydrocarbons are at least partly evaporated in the intake device and are modified chemically by cracking reactions and/or by partial oxidation, and the proportion of platinum, at least in a subregion of the catalytic coating of the components, is less than 50% of the overall mass of all the catalytically active substances in this sub region of the coating.

Exhaust gas aftertreatment system

A device is described which provides thermally durable NOgeneration in conjunction with efficient heat-up performance for filter regeneration, and low temperature HC (hydrocarbon) and CO activity. Importantly, it provides both functions while minimizing PGM (platinum group metals) utilization and its associated impact on catalyst cost.

[object Object]

An oxidation catalyst is described for the exhaust gas purification of utility vehicles with diesel engines, which contains a substrate and a catalytically active coating of platinum, active aluminum oxide and aluminum-silicon mixed oxide. The two oxidic support materials, aluminum oxide and aluminum-silicon mixed oxide, are catalytically activated with platinum, the majority of platinum being present on the active aluminum oxide. The oxidation catalyst is distinguished by good NO oxidation rates together with a high poisoning resistance against sulfur compounds.

Oxidation catalyst for commercial vehicles comprising a diesel motor

Described is a method for cleaning the exhaust gases of internal combustion engines, which method is suitable for reducing harmful gases and particle emissions. Here, the exhaust gas to be cleaned is conducted, under operating conditions, with a discontinuous profile of the air ratio &#x3bb; across a wall-flow filter substrate which comprises a catalytically active coating containing one storage material. The storage material is suitable for temporarily storing one or more exhaust-gas components under certain operating conditions and releasing said exhaust-gas components again in a targeted fashion in the event of a suitable change in the operating conditions. The coating is configured such that the component has a gradient of the storage material concentration and/or of the total coating amount, with the highest concentration of the storage material in the longitudinal direction of the component being present on the inflow side. At least 60% by weight of the storage material in relation to its total amount is present in the walls between inflow and outflow ducts, and at least 50% by weight of the storage material in relation to its total amount is present in a first, inflow-side zone in the wall-flow filter substrate.

Growing community of inventors

Frankfurt-am-Main, Germany

Anke Woerz