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Citation: Yan Jian-Hua, Liu Ying-Jun, Gui Lin-Lin, Tang You-Qi. The Surface Structure of WO₃/Titania-alumina System[J]. Acta Physico-Chimica Sinica, ;1993, 9(01): 13-20. doi: 10.3866/PKU.WHXB19930104 shu

The Surface Structure of WO₃/Titania-alumina System

1.
Department of Chemistry, Peking University, Beijing 100871

Received Date: 24 August 1991
Available Online: 15 February 1993

A series of WO_3/titania-alumina samples was prepared by impregnation method. The results of XRD and XPS show that WO_3 is dispersed as a monolayer on the surface of titania-alumina. The dispersion threshold is 0.22 gWO_3/(100 m~2). It approximately agrees with the value, 0.198 gWO_3/(100 m~2), calculated from the model on assuming that the WO_3 is dispersed as a elose-packed monolayer on titania-alumina surface. With LRS measurement, it can be found that as the loading of WO_3 is lower than 0.082 gWO_3/(100 m~2 titania-alumina), only distorted tetrahedral coordinated tungsten will be located on the surface, however as the loading of WO_3 is higher than 0.082 gWO_3/(100 m~2 titania-alumina), octahedral coordinated tungsten dominates. LRS measurements also show no Al_2(WO_4)_3 is formed as the WO_3/titania-alumina samples were calcined at 550 ℃. The formation of Al_2(WO_4)_3 at higher temperature also has been studied.
- Tungsten oxide; Titania-alumina; Dispersion threshold; Surface structure; LRS; XPS; XRD
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The Surface Structure of WO₃/Titania-alumina System