| 摘要 |
PURPOSE:To enhance decomposition efficiency and durability in the catalyst for exhaust gas of an automobile by making at least one kind of ruthenium and rhodium and at least one kind selected from among La2O3, CeO2, Pr2O3, Nd2O3, Sm2O3, Tb2O3 and Y2O3 carried on a hydrophobic carrier. CONSTITUTION:At least one kind of noble metal selected from ruthenium and rhodium and at least one kind selected from among La2O3, CeO2, Pr2O3, Nd2O3, Sm2O3, Tb2O3 and Y2O3 are carried on a hydrophobic carrier such as silica gel and activated alumina. The catalyst is produced as followes. The hydrophobic carrier is immersed in the aqueous solution of ruthenium and rhodium chlorides and impregnated with noble metal. The hydrophobic carrier is dried and immersed in the aqueous solution of nitrates selected from among La, Ce, Pr, Nd, Sm, Tb and Y nitrates and impregnated with the precursor of oxide thereof and dried and thereafter burned. Then reducing treatment is performed in H2 flow. |
