ИСТИНА

Biomorphic Ce0,5Zr0,5O2 was prepared by oxidizing pine sawdust impregnated with solution of zirconium-oxynitrate (ZrO(NO3)2) and cerium - nitrate (Ce(NO3)3. This oxide was investigated by X-ray diffraction (XRD), temperature-programmed reduction (TPR) and adsorbtion (BET) techniques. High porosity of these biomorphic oxide provides textural stability at high temperature (1273oK).In comparison with the traditional analog biomorphic Ce0,5Zr0,5O2 can release oxygen at lower temperature. This behavior is attributed to the formation of oxygen vacancies that enhance the oxide anion mobility by substituting Ce4+ or Zr4+ site with Ca2+, Mg2+ and K1+ from pine wood. Biomorphic oxide was studied by simultaneous TG-DTA analysis in oxidation of model soot (carbon black Degussa N330). The presence of these impurities in the oxide enhances the activity in the soot oxidation