Study of Ni doping on nanostructured Ce0.9Zr0.1O2

L. TOSCANI; F. PRADO; M.G. ZIMICZ; LARRONDO, S.

SAnta Fe, Argentina

Conferencia; VI San Luis Conference on Surfaces, Interfaces and Catalysis; 2018

CeO2-ZrO2 mixed oxides are interesting materials for the use as catalysts for methane catalytic oxidation. Many researchers have studied ceria-based supports for catalytic partial oxidation of methane (CPOM) reaction with nickel catalysts 1, and particularly NiO(60 wt.%)/ Ce0.9Zr0.1O2 has proved to be an active catalyst for CPOM reaction 2. In this work we look to doping the Ce0.9Zr0.1O2 mixed oxide with low contents of Ni (in the range 0.02% - 0.1% mol) in order to see the effect on the structural and redox properties. The samples of Ni- Ce0.9Zr0.1O2 were synthesized by the stoichiometric glycine-nitrate combustion route. The evolution of the crystalline structure with temperature and operating conditions (atmospheres of 5%H2 and 5%O2) was followed by in-situ XPD experiments whit synchrotron light, and the reductive behavior was analyzed by temperature programmed reduction (TPR). It was evidenced a synergic effect between the nickel and the ceria zirconia support, since the nickel reduction maximums move towards lower temperatures in comparison with pure NiO. With XPD analysis it was concluded that by the preparation method used in this work, Ni solubility in the fluorite structure of Ce0.9Zr0.1O2 is almost negligible.