摘要
A series of VOx-TiOx/SBA-15 catalysts was rized by different techniques such as N2-sorption, TPR prepared by the grafting method. The catalysts were characte- UV-Vis and NH3-TPD in order to verify the vanadium and titanium species, and their catalytic properties were investigated for the partial oxidation of toluene. The results show that vanadium mainly existed in the forms of isolated tetrahedral and octahedral species at the low loadings. The introduction of a certain amount of titanium improved the dispersion of vanadium on the support and then the catalytic performance for toluene oxidation at the same vanadium content. Both toluene conversion and benzaldehyde selectivity, showed the maximum values and then decreased with increasing the amount of titanium in the catalyst.
A series of VOx-TiOx/SBA-15 catalysts was rized by different techniques such as N2-sorption, TPR prepared by the grafting method. The catalysts were characte- UV-Vis and NH3-TPD in order to verify the vanadium and titanium species, and their catalytic properties were investigated for the partial oxidation of toluene. The results show that vanadium mainly existed in the forms of isolated tetrahedral and octahedral species at the low loadings. The introduction of a certain amount of titanium improved the dispersion of vanadium on the support and then the catalytic performance for toluene oxidation at the same vanadium content. Both toluene conversion and benzaldehyde selectivity, showed the maximum values and then decreased with increasing the amount of titanium in the catalyst.
基金
Supported by the National Natural Science Foundation of China(No.20603046)
Innovation Foundation of Chinese Academy of Sciences(No.O6SC68)