| 摘要 |
<p>A catalyst for use in purifying an emission gas from an internal combustion engine, characterized as having an anchoring material (22) on the carrier thereof, which is selected from the materials forming no compound with a catalytically active component (24) and not melting upon contacting with an emission gas of a high temperature. When the active component contains sodium, potassium, cesium, lithium, strontium or barium, and a noble metal, MgO is the most preferred anchoring material. In a catalyst for use in purifying an emission gas from an internal combustion engine, the active component thereof is prone to melt or soften and, as a result, transfer to the outside, since it contacts with an emission gas of a high temperature. The anchoring material has the function as a barrier preventing the transfer of the active component.</p> |
