Pall Corporation

Astrid Walch

Steffen Heidenreich

Max-Eckhard Roessler

Sven Chudzinski

Martin Bergmann

Manfred Gutmann

The reduction of nitrogen oxides in gas is carried out, by means of selective reaction of the nitrogen oxide with the reducing agent in the in the solid catalyst. In order to achieve high catalytic activity, the above is carried out at high gas temperatures. As a rule, ceramic filter elements, coated with catalytic material are used. This does, however, give rise to the risk the catalytically active components are stripped from the filter during the hot gas filtration. A ceramic filter element with support material in the form of particles, with binder material and catalytic material is thus disclosed, whereby the binder material comprises catalytic material, or the binder material is partly replaced by the catalyst material and the support material particles () are connected to each other by means of the catalyst and/or binder material.

Ceramic filter element

The present invention relates to filtering device which is especially designed for use as a well screen filter. The filtering device comprises a tubular supporting element () and two or more tubular segments () of a porous filter medium arranged in axial alignment to one another and concentrically and essentially coextensive with the tubular supporting element (), said tubular supporting element () having a tubular wall provided with a plurality of perforations () and having a plurality of projections projecting from said tubular wall, said projections supporting the two or more tubular segments in axial alignment with the tubular wall, said tubular segments each having two end portions which are in sealing contact with the tubular supporting element or an end portion of another tubular segment.

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Kressberg, Germany

Astrid Walch