Exhaust gas purifying filter

Details Exhaust gas purifying filter Exhaust gas purifying filter

B - Operations, Transporting

01

D

B01D 39/20 (2006.01) F01N 3/02 (2006.01) F01N 3/022 (2006.01)

Patent

CA 2374428

An exhaust gas purifying filter which uses as a filtering layer partition walls dividing through holes and formed by sealing one ends of specified through holes and the other ends of the remaining through holes of a honeycomb structure consisting of a porous ceramic material and having many through holes, wherein each partition wall has a thickness of up to 250 µ, a porosity of at least 40%, and an average pore diameter of 3-7 µ, and the volume of pores having a pore diameter of at least 10 µ accounts for up to 20% of the total pore volume. The filter can improve characteristics for trapping fine solid particles up to 0.08 µ in size without increasing a pressure loss.

L'invention concerne un filtre de purification de gaz d'échappement lequel utilise comme couche filtrante des parois de cloisons divisant des trous traversants et formées par obturation de premières extrémités de trous traversants spécifiés ainsi que d'autres extrémités des trous traversants restants d'une structure en nid d'abeilles constituée d'une matière céramique poreuse et présentant de nombreux trous traversants, dans lequel chaque paroi de cloison présente une épaisseur allant jusqu'à 250 µm, une porosité d'au moins 40 % et un diamètre de pore moyen de 3-7 µm, le volume des pores ayant un diamètre de pores d'au moins 10 µm constitue jusqu'à 20 % du volume total de pores. Le filtre peut améliorer les caractéristiques de piégeage de fines particules solides jusqu'à une grosseur de 0,08 µm sans augmenter la perte de pression.

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