Reduction of carbon monoxide, hydrocarbons and soot particles in lean exhaust gas from internal combustion engine, by using particle filter having catalytic coating of oxygen storage component(s) and platinum group metal(s)

摘要

Carbon monoxide, hydrocarbons and soot particles in the lean exhaust gas are reduced by using a particle filter. The particle filter has a catalytic coating containing a first group of components for reducing the ignition temperature soot and platinum group metal(s) of platinum, palladium or rhodium. The first group comprises oxygen storage component(s). Reduction of carbon monoxide, hydrocarbons and soot particles in the lean exhaust gas from an internal combustion engine involves using a particle filter. The soot particles have a soot ignition temperature. The particle filter is regenerated from time to time by raising the temperature of the particle filter to above the soot ignition temperature and burning the soot particles. The temperature of the filter is increased to the temperature required to initiate soot ignition by burning additional fuel on the catalytic coating when the exhaust gas back pressure reaches a predetermined value. The particle filter has a catalytic coating containing a first group of components for reducing the ignition temperature soot and platinum group metal(s) of platinum, palladium or rhodium. The first group comprises oxygen storage component(s). An Independent claim is also included for a particle filter for use in the above process. The particle filter can be wall flow filter, wire mesh filter, or open pore ceramic or metallic foam filter.