| 摘要 |
PURPOSE:To attain excellent effects such as a very slight change with the lapse of time as well as to perform efficient decomposition of nitrous oxide in exhaust gas by carrying iridium and one or more among La2O3, CeO2, Pr2O3, Nd2O3, Sm O3, Tb2 O3 and Y2O3 on a hydrophobic carrier. CONSTITUTION:This catalyst for decomposition of nitrous oxide is a catalyst obtd. by carrying iridium and one or more kinds of oxides selected among La2O3, CeO2, Pr2O3, Nd2O3, Sm2O3, Tb2O3, and Y2O3, on a hydrophobic carrier such as silica gel, activated alumina or silica-alumina. When this catalyst is produced, the hydrophobic carrier is immersed in an aq. soln. of iridium chloride for a certain time to impregnate the noble metal and the carrier is dried and further immersed in an aq. soln. of one or more among lanthanum nitrate, cerous nitrate, praseodymium nitrate, neodymium nitrate, samarium nitrate, terbium nitrate and yttrium nitrate for a certain time to impregnate these precursors of oxides. The carrier is then dried, fired and subjected to reduction treatment in a flow of gaseous H2. |
