PROMOTIONAL EFFECTS OF Co，Ni INCORPORATION ON CATALYTIC PERFORMANCE OF Pd-Rh BASED ON THREE-WAY CATALYSTS FOR SIMULTANEOUSLY REMOVING C3H8 ，CO AND NO

Series of low amount of Pd-Rh based on three-way catalysts，the ones single incorporated with Co or Ni，and the ones double incorporated with Co and Ni，using cordierite honeycomb ceramics as the first carrier and coating containing activated alumina and ceria-zirconia solid solution as the second carrier，were prepared by incipient impregnation method． The effects of Co or Ni single incorporation and double incorporation on catalytic activities of Pd-Rh based on catalysts for simultaneously removing C3H8 ，CO and NO were studied． The results showed that the catalysts incorporated with Co and Ni had higher catalytic activity than that incorporated with Co or Ni． For double incorporation of Co and Ni，the catalyst added with 1% Co3O4 and 2% NiO exhibited the best catalytic activities，the removal rates of C3H8 and CO at 350 ℃ were 100% and 97%，and the removal rate of NO at 400 ℃ was 99%．