Filter for the aftertreatment of exhaust gases of internal combustion engines

Wall-flow filter for removing particles from the exhaust gas of an internal combustion engine, which comprises a wall- flow filter substrate of length L and coating F,

• wherein the wall-flow filter substrate has channels E and A extending in parallel between a first and a second end of the wall-flow filter substrate, which are separated by porous walls and form surfaces OE and OA, and wherein the channels E are closed at the second end and the channels A are closed at the first end, and
• wherein coating F is located on the surfaces OE, optionally in the porous walls but not on the surfaces OA,
• characterized in that coating F comprises a sintered material S, wherein material S comprises an oxide, oxide-hydroxide, carbonate, sulphate, silicate, phosphate, mixed oxide, composite oxide, molecular sieve or a mixture comprising two or more of these materials, wherein coating F is applied onto the surfaces OE by depositing material S in powder form onto the channels E, followed by a thermal treatment to cause sintering of material S, and the heat treatment comprises heating the wall-flow filter substrate which carries material S on its surfaces OE to a temperature T and maintaining this temperature for a period of time M, and the wall-flow filter substrate is heated with a heating rate of 100 to 1000 K/h to a temperature T of 100 to 1350° C. and maintained at that temperature for a period of time M of 1 second to twelve hours.