Degussa Aktiengesellschaft

Degussa - Huls Ag

Ewald Dittrich

Gerhard Birtigh

Reinhard Manner

Felix Schmidt

Martin Foerster

Wolfgang Hasselmann

Bernd Mergner

Walter Leibold

Wilfried Baumgartner

Michael Hoffmann

Robert Schafer

A process for the coating of the flow channels of a cylindrical, honeycomb form catalyst carrier with a dispersion coating through filling of the vertically oriented flow channels with a fill quantity of the coating dispersion through the bottom face of the catalyst carrier and subsequent downward emptying and clearance extraction of the flow channels, as well as drying and calcination of the catalyst carrier, by the following steps:

Process for the coating of the flow channels of a honeycomb form

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

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

Apparatus and method for removing washcoat remaining in the channels of

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Grosskrotzenburg, Germany

Ewald Dittrich