Umicore

About: Umicore is a company organization based out in Brussels, Belgium. It is known for research contribution in the topics: Catalysis & Exhaust gas. The organization has 1253 authors who have published 1516 publications receiving 23358 citations. The organization is also known as: Union Miniere.

Annular disc of bent sheet material

Abstract: The invention relates to an annular disc of bent sheet material (21) with at least one junction at which the annulus is closed. Furthermore, a method for producing an annular disc is disclosed, comprising the steps of: (a) providing a sheet material; (b) bending the sheet material into an annular disc; (c) severing the sheet material, so that an annular disc with a junction at which the annulus is open is provided; (d) closing the junction, so that an annular disc with a junction at which the annulus is closed is provided. A description is given of a method for producing an annular disc comprising the steps of: (i) providing a sheet material; (ii) bending the sheet material into a first part of an annular disc; (iii) severing the sheet material, so that a first part of an annular disc is provided; (iv) repeating steps (i), (ii) and (iii) at least once, so that at least one further part of the annular disc is provided; and (v) connecting the first part and the further parts of the annular disc, so that an annular disc with at least two junctions at which the annulus is closed is provided.

Catalyst and method for the reduction of nitrogen oxides

Abstract: The invention relates to a nitrogen oxide storage catalyst consisting of at least two catalytically active washcoat layers on a supporting body, a lower washcoat layer (A) containing cerium oxide, an alkaline earth compound and/or an alkaline compound and platinum and an upper washcoat layer (B), which is arranged on top of washcoat (A), containing cerium oxide, platinum and/or palladium and no alkaline earth compound. The invention also relates to a method for converting NO x in the exhaust gases of motor vehicles operated using lean-burn engines.

Ferrocenyl ligands for homogeneous, enantioselective hydrogenation catalysts

Abstract: Compounds of the formula (I) or (I'), where R1 is a hydrogen atom or C1-C4-alkyl and R'1 is C1-C4-alkyl; X1 and X2 are each, indepen­dently of one another, a secondary phosphine group; R2 is hydrogen, R01R02R03Si-, C1-C18 -acyl substituted by halogen, hydroxy, C1-C8-alkoxy or R04R05N-,-or R06-X01-C(O)-; R01, R02 and R03 are each, independently of one another, C1-C12-alkyl, unsubstituted or C1-C4-alkyl­or C1-C4-alkoxy-substituted C6-C10-aryl or C7-C12-aralkyl; R04 and R05 are each, indepen­dently of one another, hydrogen, C1-C12-alkyl, C3-C8-cycloalkyl, C6-C10-aryl or C7-C12-aralkyl, or R04 and R05 together are trimethylene, tetramethylene, pentamethylene or 3-oxapentyle­ne; R06 is C1-C18-alkyl, unsubstituted or C1-C4-alkyl- or C1-C4-alkoxy-substituted C3-C8-cyclo­alkyl, C6-C10-aryl or C7-C12-aralkyl; X01 is -O- or -NH-; T is C6-C20-arylene; v is 0 or an integer from 1 to 4; and * denotes a mixture of racemic or enantiomerically pure diastereomers or pure racemic or enantiomerically diastereomers, are excellent chiral ligands for metal com­plexes as enantioselective catalysts for the hydrogenation of prochiral organic compounds.

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

Abstract: 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 °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.