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The catalytic activity of Pd catalysts supported on Ce0.73Tb0.27 O x/Si O2, Ce0.6Zr0.4O x/Si O2,Ce0.73Tb0.27 O x/La2O3–Al2O3and Ce0.6Zr0.4O x/La2O3–Al2O3was studied using the reduction of NO by CO. The catalysts were characterized by X-ray fluorescence, surface area, X-ray diffraction, temperature-programmed reduction, CO chemisorption and oxygen storage capacity. Temperature-programmed reduction results indicated that Tb or Zr incorporation improves the reducibility and oxygen storage capacity. CO chemisorption data suggested the presence of large Pd O particles due to the low CO/Pd ratio. No significant differences were obtained in light off temperatures(T Light off) for all Pd catalysts and the most active was1.5%Pd/Ce0.6Zr0.4O x/Si O2.
The catalytic activity of Pd catalysts supported on Ce0.73Tb0.27Ox / Si02, Ce0.6Zr0.4Ox / Si02, Ce0.73Tb0.27Ox / La2O3-Al2O3 and Ce0.6Zr0.4Ox / La2O3-Al2O3was studied using the reduction of NO by CO. The catalysts were characterized by X-ray fluorescence, surface area, X-ray diffraction, temperature-programmed reduction, CO chemisorption and oxygen storage capacity. Temperature-programmed reduction results indicated that Tb or Zr incorporation improves the reducibility and oxygen storage capacity. CO chemisorption data suggests the presence of large Pd O particles due to the low CO / Pd ratio. No significant differences were obtained in light off temperatures (T Light off) for all Pd catalysts and the most active was 1.5% Pd / Ce 0.6 Zr 0.4 O x / Si O 2.