Catalytic filter material and method of making same

Details Catalytic filter material and method of making same Catalytic filter material and method of making same

B - Operations, Transporting

01

J

23/342, 252/38,

B01J 35/06 (2006.01) B01D 39/08 (2006.01) B01D 39/16 (2006.01) B01D 39/20 (2006.01) B01D 53/88 (2006.01) B01J 31/06 (2006.01) B01J 21/06 (2006.01) B01J 23/22 (2006.01) B01J 23/30 (2006.01)

Patent

CA 2228597

The present invention is an improved catalytic filter material for use in removing contaminants such as NOx from a fluid stream . The filter of the present invention employs composite fibers of expanded polytetrafluoroethylene (PTFE) filled with catalytic particles. The composite fibers are chopped into staple fibers and made into a felt material. Preferably, the felt material is then laminated on at least one side with a protective microporous membrane. The combined filter removes both macro-particles, such as dust, from the filter stream before the dust can clog active catalytic sites and effectively catalytically converts undesirable contaminants in the fluid stream to acceptable end products.

Cette invention porte sur un matériau pour filtre catalytique utilisable pour débarrasser un flux de fluide de contaminants tels que NO¿x?. Le filtre selon l'invention fait intervenir des fibres composites de polytétrafluoroéthylène (PTFE) expansé remplies de particules catalytiques. Les fibres composites sont coupées en fibres courtes et transformées en feutre. Ce dernier est alors, de préférence, doublé sur l'une au moins de ses faces d'une membrane protectrice microporeuse. Ce filtre combiné, d'une part débarrasse le flux de fluide des macro-particules, de la poussière notamment, avant que celle-ci n'ait pu boucher des sites actifs de catalyse et, d'autre part convertit efficacement en produits définitifs acceptables, par catalyse, des contaminants indésirables se trouvant dans le flux.

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