TRAP-TYPE CATALYST FOR CLEANING NOX-DEPLETED EXHAUST GASES AND EXHAUST GAS CLEANING SYSTEM Russian patent published in 2015 - IPC B01J23/58 B01D53/94 

FIELD: chemistry.

SUBSTANCE: invention relates to a trap-type catalyst for cleaning NOx-depleted exhaust gases, containing catalytic noble metals: platinum, palladium and rhodium; inorganic oxides which support the catalytic noble metals; and at least one NOx adsorbent selected from a group consisting of magnesium, barium, sodium, potassium and caesium; wherein among said inorganic oxides, the inorganic oxide supporting palladium, contains cerium, aluminium and/or zirconium, and wherein said inorganic oxide contains 1-20 wt % cerium in terms of CeO₂.The invention also relates to an exhaust gas cleaning system, containing said catalyst and an additional catalytic converter which contains a catalytic noble metal and is placed upstream of the trap-type converter for cleaning NOx-depleted exhaust gases relative to the direction flow of exhaust gases.

EFFECT: longevity of the catalyst and exhaust gas cleaning system.

5 cl, 3 tbl, 1 dwg, 17 ex