Particle filter for use in exhaust line of e.g. diesel engine, has caps and ceramic filtering material having porosity of specific percent, where filtering material is saturated with washcoat for retaining nitrous oxide in form of nitrates

The filter (2) has caps (6) and a ceramic filtering material (3) having a porosity of 40 percent. The material is saturated with washcoat for retaining nitrous oxide in form of nitrates (4). The washcoat has a precious metal e.g. platinum, transition metal and lanthanide oxides and alkaline and alkaline-earth elements. The metal has a mass proportion between 0.01 and 5 percent with respect to total weight of the washcoat. An independent claim is also included for a method for catalytic filtration of particles contained in exhaust gas of an internal combustion engine. La présente invention concerne un filtre à particules monté dans la ligne d'échappement 1 d'un moteur à combustion interne, notamment d'un moteur Diesel, comprenant un filtre à particules 2 comprenant des bouchons 6 et un matériau céramique 3 présentant une porosité d'au moins 40 % imprégné d'une formulation catalytique capable de retenir les oxydes d'azotes, ladite formulation comprenant au moins un métal précieux, au moins un oxyde de métal de transition et/ou de terres rares, et au moins un élément alcalin et/ou alcalinoterreux.