| .LASER RAMAN SPECTROSCOPY AND TEMPERATURE PROGRAMMED REDUCTION STUDY OF SUPPORTED TUNGSTEN OXIDE[J].分子催化,1990,(Z1): |
| LASER RAMAN SPECTROSCOPY AND TEMPERATURE PROGRAMMED REDUCTION STUDY OF SUPPORTED TUNGSTEN OXIDE |
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| 基金项目:Project supported by National sience Foundation of China |
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| 中文摘要: |
| LRS, XRD, UV-DRS and TPR techiques have been used to characterize supported tungsten oxide catalysts. Experimental results show that WO_3 is highly dispersed on γ-Al_2O_3, TiO_2, SnO_2 and ZrO_2 until a complete monolayer coverage is achieved. However, WO_3 is poorly dispersed on SiO_2 Raman spectroscopy is a very powerful technique for distinguishing highly dispersed and crystalline WO_3 on the surface. For the samples with monolayer coverage of WO_3, the Raman shift of surface W-O species varies with the support. The support stabilizes surface W-O species and substantially suppresses its reduction and changes the reduction process as well. The coordination state of the W-O species on the support surface depends on the loading and the crystalline structure of the support. The Raman shift and T_m value of the TPR peak of the surface W-O species are correlated with the interaction between WO_3 and the support. |
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