Patent ID: 6770252
Filing Date: 2004-08-03
Classification: B01D,F01N,Y02C,Y02T

Abstract:
A rolling regeneration diesel particulate filtering process that reuses NO produced in the process to generate additional amounts of NO2, comprising:flowing diesel engine combustion exhaust through a filter system comprising a first section and a second section, and wherein the first section is positioned upstream of the second section with respect to the flow direction of the exhaust gas, and wherein the first section includes a foam constructed and arranged to trap carbon-based particulates in the exhaust, and a first catalyst carried by the foam to promote the conversion of NO in the exhaust from the diesel engine to NO2, and to promote the reaction of at least a portion of the particulates trapped in the foam with NO2 to form CO and NO, and wherein the first catalyst carried by the foam further promotes the oxidation of CO to CO2, and the oxidation of NO, generated by the reaction of NO2 with carbon, to generate additional NO2, and wherein the second section includes a wall flow filter having at least one through hole cell formed therein running the longitudinal length of the wall flow filter, and the wall flow filter being constructed and arranged to trap particulates in the exhaust and to promote the reaction of NO2 and C to produce NO and CO.