| 摘要 |
PURPOSE: To remove nitrogen oxide at high efficiency from an oxygen-containing exhaust gas by using a catalyst prepared by carrying Pt, Sr, a rare earth metal and Fe on an inorganic carrier. CONSTITUTION: A γ-Al2 O3 >=1mm to <Zmm in particle diameter is impregnated with a Ce nitrate aq. solution, dried at about 100 deg.C for 2hr and fired at about 600 deg.C for 2hr. Succeedingly, the γ-Al2 O3 is impregnated with strontium nitrate aq. solution, dried and fired by the same way, further is impregnated with a dinitrodiammine-Pt nitrate solution, dried and fired by the same way and finally is impregnated with a Fe nitrate aq. solution, dried and fired by the same way. As a result, the catalyst containing 1.6wt.% Pt, 30wt.% Sr, 12wt.% Ce and 5wt.% Fe per the γ-Al2 O3 of 100 is obtained. In this case, a honeycomb like catalyst 3 for med by coating a cordierite or metal-made honeycomb catalyst base body 2 with the catalyst power 3 can be produced. Then nitrogen oxide in a lean burnt exhaust gas is removed at high efficiency. |
