| 摘要 |
<p>The invention relates to an adsorbent catalyst for reducing the amounts of nitrogen oxides, hydrocarbons and carbon monoxide contained in exhaust or combustion gases, which catalyst adsorbs nitrogen oxides, when the exhaust or combustion gases contain in excess of oxygen, and liberates and reduces the adsorbed nitrogen oxides, when said gases contain oxygen in stoichiometric amounts or less, which adsorbent catalyst comprises a porous support material (3, 4) the surface area of which is large and which contains at least the following: a first catalytic metal (5), which is Pt, a first NOx adsorbent (7), which contains at least one of the following metals: Ba and Sr, a second NOx adsorbent (8), which contains at least one of the following metals: La and Y, and a redox NOx adsorbent (11), which contains at least one of the following metals: Ce, Zr, Ti, Nb, Mn, Pr, Nd, Sm, Eu and Gd. The invention also relates to a method for reducing the amounts of nitrogen oxides, hydrocarbons and carbon monoxide contained in exhaust or combustion gases. <IMAGE></p> |
