Effet de la morphologie des nanoparticules de CeO2 et ZrxCe (1-x)O2 sur l’activité catalytique dans l’oxydation du CO
|Abstract:||The presented works involve the study and the elaboration of the synthesis of cerium oxide CeO2 and oxide mixed CexZr(1-x)O2 nanoparticles with a controlled morphology. Various morphologies including nanocube, nanobar and nanopolyhedron have been obtained depending on the synthesis conditions. A deposit of gold on the surface of synthesized nanoparticles has been carried out. The choice of gold nanoparticles as active phase is due to their high catalytic activity at low temperatures. These catalysts had been characterized by various techniques (TEM, BET) and subjected to catalytic tests for CO oxidation. The results show that the cubic form of nanocatalysts give a better result compared to nanobars and nanopolyhedron. This is explained by the fact that their specific surface is greater and preferably gold nanoclusters to be deposited on the face (100) nanocubes. The obtained result is supported by the activation energy calculation. In order to improve the catalytic activity and stability of this type of Nanocatalyst, a portion of the cerium zirconium has been substituted. The catalytic test results show that the substitution limit shall not exceed 10% zirconium. Beyond this level, the complete conversion of CO to CO2 is significantly smaller than the nanocatalysts based on simple nanocubes CeO2.|
|Document Type:||Mémoire de maîtrise|
|Open Access Date:||23 April 2018|
|Collection:||Thèses et mémoires|
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