| abstract |
The invention relates to a device (11) for the treatment of NOx, for an exhaust line (1), of an internal combustion engine (3) comprising at least one compound capable of storing and removing the NOx in the presence of NH3. , characterized in that said compound is constituted by at least one heteropoly acid of generic formula H3XM12O40.6H2O or H4XM12O40.nH2O, with M being W or Mo, X being chosen from P, Si or Ge, and n being an integer equal to 12 , 14, 15 or 24, said at least one heteropoly acid having a Keggin cluster type crystal structure.The invention also relates to an exhaust line comprising said device and a vehicle comprising such an exhaust line. |