Method of producing a catalysed particulate filter and filter thus obtained

Abstract

The invention relates to a method of producing a catalysed particulate filter. The invention is characterised in that, in order to lower the particulate oxidation temperature, the filter is provided with a cerium oxide, a zirconium oxide or a cerium / zirconium mixed oxide which can also comprise at least one rare earth oxide other than cerium. The porosity of said oxide or mixed oxide is such that at least 80 % of the pore volume comprises pores having a diameter of least 20 nm.

Description

technical field

[0001] The invention relates to a method for the production of a catalyzed particle filter and the filter obtained therefrom. Background technique

[0002] During the combustion of hydrocarbon fuels, among their combustion products, carbonaceous or hydrocarbonaceous products form carbonaceous particles, which are also denoted by the word "soot" in the following description, known to be harmful to the environment and to health. is harmful. The emission of these soot must therefore be reduced.

[0003] The most commonly adopted technology for this purpose is to equip the exhaust system with a particulate filter capable of blocking all or a high proportion of carbonaceous particles produced by the combustion of various fuels.

[0004] However, due to the gradual accumulation in the filter, the soot causes firstly an increase in pressure loss and secondly the appearance of clogging, which leads to a loss of engine performance. The soot collected by these filte...