Ecofriendly catalysts based on mixed xerogels for liquid phase oxidations by hydrogen peroxide

M. PALACIO; P. VILLABRILLE; G. ROMANELLI; P. VÁZQUEZ; C. CÁCERES

Louvain-La Neuve Belgica.

Congreso; 10th International Symposium “Scientific Bases for the Preparation of Heterogeneous Catalysts”; 2010

Université Catholique de Louvain, Louvain-Ia-Neuve, Belgium,Katholieke Universiteit Leuven, Heverlee (Leuven), Belgium

In this study Ti02-CeO2 and Ti02-V2OSmixed oxide were synthesized by sol-geltechnique. The mixed xerogels were prepared with different load of Ti02 and Ce02 orV2Os,using titanium isopropoxideand hexahydratedceriumnitrate or vanadyl acetylacetonateas precursors, and ethanol (99.8%) as solvent. The gels were dried in air at 50°Cfor 24 h and calcined in air at temperatures in fue range 200-800°C for 4 h. Moreover, asample without cerium, 100% (w/w) Ti~, was prepared to be kept as referentematerial. The prepared solids were characterized by means ofXRD, FT-IR and TEM.Their textural properties were determined by adsorption-desorption isotherms of N2 at77 K. The xerogels were tested as catalysts in fue liquid phase oxidation of 2,6-dimethylphenol to 2,6-dimethyl-p-benzoquinone at 20°C, using ethanol as solvent andaqueous hydrogen peroxide as a c1eanoxidizing agent.