Gold catalysts on ceria doped with MeOx (Me = Fe, Mn, Co and Sn) for complete benzene oxidation: effect of composition and structure of the mixed supports

作者：Ilieva L^*; Petrova P; Tabakova T; Zanella R; Kaszkur Z

来源：Reaction Kinetics, Mechanisms and Catalysis, 2012, 105(1): 23-37.

DOI：10.1007/s11144-011-0368-2

• Gold catalysts
• Doped ceria
• Complete benzene oxidation

Gold catalysts supported on ceria doped with different metal oxides (Fe, Mn, Co and Sn) were synthesized using two techniques: CP and mechanochemical activation. The catalytic activity in complete benzene oxidation (CBO) was studied. The samples were characterized by means of XRD and high resolution transmission electron microscopy, and non-significant differences in the average size and the distribution of gold particles were observed. This means that the main reason for the different catalytic behavior in CBO has to be searched in the composition and structure of the supports. In spite of the higher hydrogen consumption (e.g., higher oxygen mobility) estimated by means of TPR, the gold catalysts on ceria doped with transition metal oxides generally are less active than gold/ceria catalyst. This observation could be explained taking into consideration that the key factor for the high oxidation activity is not the oxygen supplying but the activation of the very stable benzene molecule. The higher catalytic activity in comparison with that of the gold/ceria catalyst was observed only using a mixed ceria-CoOx support mechanochemically prepared. Very high and stable catalytic activity in CBO was obtained over this sample.

• 出版日期2012-2