Corning Incorporated

Ceramem Corporation

Stobbe Tech Holding A/s

Per Stobbe

Robert L Goldsmith

Bruce A Bishop

Jakob Weiland Hoi

A filter device for filtering soot particles from diesel engine exhaust gases comprises a casing, a shaped porous filter body, preferably of silicon carbide, SiC, such as a honeycomb structure wall flow filter body made from SiC particles. A membrane made from particles and/or fibres and having a smaller pore size than the filter body is applied on the gas outlet side surfaces of the filter body, and a catalytically active coating is applied on, and in the interior of, the filter body, e.g., on a wash coating. The design of the filter body with the small pore size membrane applied to outlet surfaces allows soot particles to travel into the interior of the filter which has relatively large pores and where they are removed by decomposition by contact with the catalyst deposited in the filter body. Due to the small pore size of the membrane on the outlet side, the filter is able to remove very small soot particles, and due to the large active area where an oxidation catalyst and the trapped soot interact, the temperature at which the soot is decomposed is relatively low.

Diesel exhaust gas filter

A cross-flow filtration device which receives a feed stock at a feed end face and separates the feed stock into filtrate and retentate. The device has a structure formed from a plurality of substantially parallel monolith segments of porous material, each segment having a plurality of passageways which extend longitudinally from the feed end face to a retentate end face of the structure. The structure contains a filtrate conduit network comprised of both an intersegment filtrate conduit, formed by the arrangement of the segments, and at least one intrasegment filtrate conduit formed within at least one segment. The filtrate conduit network provides low pressure drop flow paths for filtrate flow through the porous material from the passageways to nearby filtrate conduits, and at least some of the passageways are separated from filtrate conduits by intervening passageways, thereby enabling a high ratio of passageway surface area to volume of the device and a high rate of filtrate removal.

Growing community of inventors

Frederiksberg, Denmark

Per Stobbe