A study of thoria on the surface of gamma-Al2O3.
The dispersion of thoria on the surface of gamma-Al2O3 and the surface properties of ThO2/gamma-Al2O3 samples, as well as the influence of the loading amount of thoria on the reduction behavior of copper oxide species, have been studied using XRD, XPS, FTIR, and TPR. The results indicate that the dispersion capacity of thoria, like that of ceria, is much lower than for two other tetravalent metal oxides, zirconia and titania, and the surface adsorption amount of the carbonyl compound and H2O slightly increases with increasing thoria loading. The different thoria loadings can influence the reduction behavior of the dispersed copper oxide by comparing the TPR results of CuO/ThO2/gamma-Al2O3 samples. In addition, the lower dispersion capacities of thoria and ceria on gamma-Al2O3 are tentatively discussed by considering the structural stability of the two oxides.
Shen
Ming-Min
MM
Department of Chemistry, Laboratory of Mesoscopic Materials Science, Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, PR China.
Hu
Yu-Hai
YH
Zhu
Hai-Yang
HY
Liu
Tian-Dong
TD
Wei
Shu-Ting
ST
Dong
Lin
L
Chen
Yi
Y