Synthèse et caractérisation de catalyseurs à base de nanoparticules d’or supportées sur MgAl-LDH ou GNP/MgAl-LDH pour application dans des réactions catalytiques : Oxydation du 5-hydroxyméthylfurfural (HMF) et réduction du 4-Nitrophénol

Abstract

This thesis reports a study of the effect of both particlesizeof gold and support on catalytic activity in Redox Catalytic Reactions: 5-Hydroxymethylfurfural (HMF) Oxidation and 4-Nitrophenol Reduction. MgAl-LDH with different Mg/Al molar ratios and GNP/MgAl-LDH solids are used as supports for catalysts based on gold preparation. TheHMF oxidation in FDCA and 4-nitrophenol (4-NP) reduction were chosen to investigate the catalytic activity as a model reaction for biomass valorization and wastewater remediation. HMF was oxidized over AuNP-based catalysts supported on MgAl-LDH, in this reaction a promotion of the catalyst within alkaline aqueous solutions presence and basic support properties yielded a catalytic system with remarkable activity and selectivity. For 4-nitrophenol reduction, excellent results of Au/GNP/MgAl-LDH catalysts are obtained in this type of reaction. Furthermore, AuNP/GNP/MgAl-LDH exhibited a good stability