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Citation: Shangguan Rong-Chang, Ge Xin, Zhang Hui-Liang. Natures of Oxygen Species on the Surfaces of Ce-Mo Oxides and Catalytic Activities for the Selective Oxidation of Toluene[J]. Acta Physico-Chimica Sinica, ;1999, 15(06): 568-572. doi: 10.3866/PKU.WHXB19990617 shu

Natures of Oxygen Species on the Surfaces of Ce-Mo Oxides and Catalytic Activities for the Selective Oxidation of Toluene

1.
Department of Chemistry,Nanjing University,Nanjing 210093

Received Date: 8 July 1998
Available Online: 15 June 1999

A series of Ce-Mo oxide catalysts with different Ce/Mo atomic ratio were prepared and applied to selective oxidation of toluene to benzaldehyde. The structures and properties of the surfaces of catalysts were characterized by XRD, TPR and DR-UVS. The natures of oxygen species on the surfaces of these samples were studied by using temperature programmed desorption-mass spectrography(TPD-MS). The results showed that the oxygen species of multiple adsorption existed on the sample surface. And in the range of desorption temperature<900℃, for the Ce-Mo samples, not only the desorption peaks of O- species on surfaces of samples be discoved, but also the O2- species appeared. As the content of Ce in Ce-Mo oxides was changed, the activation energy of oxygen desorption(Ed) also changed. The Ed value of sample 3 (Ce/Mo=1/1) is the lowest and its selectivity of benzaldehyde in toluene oxidation is the highest. Thus, a Parallel relation between the Ed value and the selectivity for benzaldehyde existed in these Ce-Mo oxides.
- Ce-Mo oxide,
- TPD-MS,
- Natures of oxygen species on the surface,
- Selective oxidation of toluene
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