| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a highly heat resistant catalyst for exhaust gas purification having a high HC adsorption characteristic in a wide range of temperature and suppressive to desorption of HC before the temperature reaches the catalyst active temperature. SOLUTION: This catalyst for exhaust gas purification comprises a solid super strong acid, an HC adsorbent which can adsorb HC at low temperature, and catalytic noble metals. HC in an exhaust gas is adsorbed on the HC adsorbent in a temperature range as low as about room temperature and HC desorbed from the HC adsorbent in a high temperature range is adsorbed in the solid super strong acid. After that, when the exhaust gas temperature reaches the active temperature of the catalytic noble metals, HC released from the solid super strong acid is purified by oxidation by the catalytic noble metals.</p> |
