Gas filter

Details Gas filter Gas filter

F - Mech Eng,Light,Heat,Weapons

01

N

F01N 3/10 (2006.01) B01D 46/24 (2006.01) B01D 53/28 (2006.01) B01D 53/64 (2006.01) F01N 3/022 (2006.01) F01N 3/031 (2006.01) F01N 13/02 (2010.01) F01N 3/021 (2006.01) F01N 7/02 (2006.01)

Patent

CA 2145394

A vehicle exhaust filter comprises a cylindrical housing (4, 5, 6) with inlet and outlet spigots (7 and 8) enabling it to be in- cluded in a vehicle's exhaust duct. Partition walls (13, 14, 15, 16) within the housing support four porous ceramic cylindrical filter elements, namely two upstream elements (9, 10) and two downstream elements (11, 12). The partition walls are ported in a man- ner such that gas flowing from inlet spigot (7) to outlet spigot (8) must pass through the cylinder wall of one or other of the up- stream elements (9, 10) and, thereafter through the cylinder wall of one or other of the downstream elements (11, 12). The up- stream elements hold a quantity of adsorbed potassium aluminium sulphate to convert lead residues in the exhaust into lead sulphate and the downstream elements hold a quantity of adsorbed trisodium orthophosphate or other hygroscopic salt to main- tain their surfaces moist and tacky.

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