Degussa Aktiengesellschaft

Felix Schmidt

Reinhard Manner

Gerhard Birtigh

Ewald Dittrich

Rainer Domesle

Dieter Kerner

Adolf Wagner

Dietrich Bauer

Edgar Koberstein

Bernd Engler

Bernd Mergner

Peter Schubert

Wilfried Baumgartner

Edmund Fehn

Joerg Plessow

A process is described for defined impregnation of honeycomb structures and a device for performing the process. The impregnating solutions are sprayed directly into the flow channels in the honeycomb structure using hollow injector needles.

Process and device for defined impregnation of honeycomb structures with

A catalyst for purifying the exhaust gases of internal combustion engines with improved light-off behavior and improved durability with reduced specific noble-metal content is disclosed which uses active aluminum oxide provided with customary promoters as carrier and platinum and/or palladium and rhodium in customary amounts as noble metals. In addition, it contains one or more base metals in amounts up to 5 times the mass of the total noble metal which are brought into the immediate vicinity of the rhodium by means of a special manufacturing technique.

Catalyst for purifying the exhaust gases of internal combustion engines

A method for the uniform coating of honeycomb bodies with finely divided solid matter from a dispersion in an amount which is below that which arises during customary immersion. To this end, the honeycomb is flooded from below with dispersion, emptied after a dwell time and blown out. Filling time, filling amount, dwell time emptying time as well as the time between emptying and blowing out are measured in such a manner that in order to increase the separated amount of solid matter, filling time, dwell time, pumping-out time and the time between emptying and blowing out are increased but the filling amount is reduced.

Method of coating honeycomb bodies with finely divided solid matter

The thermal shock resistance of monolithic catalysts is improved by pre-coating a ceramic monolithic carrier, before the application of catalytic components, with an organic filling material which can be melted and burned out and which comprises a dispersion of very fine solid particles, by heating the carrier above the melting point of the filling material, then applying the catalytic components and then burning out the filling material.

Method of improving the thermal shock behavior of monolithic catalysts

An apparatus and a method are disclosed for the removal and the recovery of washcoat remaining in the channels of freshly coated monolithic or honeycombed catalytic carriers. The carrier is inserted into a chamber from above and tightly fitted therein at least with the lowest part of the carrier therein. The chamber is fitted with a collection area and a runoff located thereunder. The runoff leads via a shutoff valve into a separation vessel under a vacuum. The opening and closing of the shutoff valve causes air to be aspirated through the carrier channels, which are open at the top or are gradually opened by means of a slotted slide. This action causes the washcoat remnants to be transferred into the separation vessel, where they can be collected in the sump and are then pumped off. The apparatus can be used in systems for manufacturing catalysts for cleaning exhaust gases.

Method for removing washcoat remaining in the channels of freshly coated

Finely divided precipitated silica with high structure and a

Finely divided, precipitated silica with high structure, method of its

Apparatus and method for removing washcoat remaining in the channels of

Finely divided precipitated silica for use as a delustering agent with high structure and a

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Rheinfelden, Germany

Felix Schmidt