Patent Number: 6,165,429

Title: Exhaust gas purifying catalyst and exhaust gas purifying method

Abstract: An exhaust gas purifying catalyst is formed of a first powder formed of porous particles supporting rhodium (Rh), and a second powder formed of porous particles supporting platinum (Pt) and a nitrogen oxides (NOX)-adsorbing material. The second powder and the first powder are present in a mixed state. In this catalyst, Rh is supported apart from Pt and the NOx adsorbent, so that reduction of the oxidizing performance of Pt is prevented, and so that the problems of poor compatibility between Rh and the NOx adsorbent is eliminated. The catalyst therefore maintains high NOx removing rate not only during an initial period but also after the endurance test.

Inventors: Ikeda; Yasuo (Toyota, JP), Hirata; Hirohito (Toyota, JP)

Assignee: Toyota Jidosha Kabushiki Kaisha

International Classification: B01J 23/58 (20060101); B01J 23/54 (20060101); B01D 53/94 (20060101); B01J 23/46 (20060101); B01J 23/89 (20060101); B01J 37/02 (20060101); B01J 37/00 (20060101); B01J 35/00 (20060101); F01N 3/08 (20060101); F01N 3/28 (20060101); B01J 29/22 (20060101); B01J 29/00 (20060101); B01J 29/12 (20060101); B01D 053/64 ()

Expiration Date: 12/26/2017