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《Chinese Journal of Catalysis》 1992-01
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STUDY ON THE NON-CRYSTALLINE PHASE AT INTERFACE OF BINARY TRANSITION METAL OXIDES Mo/Zr, Mo/V AND Mo/W

Wang, Zhi-min; Li, Yong-zhan(Department of Chemistry, Heilongjiang University, Harbin 150080)and Han, Wei-ping(Institute of Surface Chemistry of Harbin Normal UniversHy, Harbin 150080)  
The dispersion capacities of ZrO2, V2O5 and MoO3 at the interface of MoO3/ZrO2 and MoO3/V2O5 calcined at 500℃ for 5h were studied by XRD and FT-IR difference spectra. The results show that there is a monolayer of the non-crystalline phase of V2O5 and ZrO2 at the interface, and 3 - 4 layers for MoO3. When MoO3 content is higher than the threshold value, the increment of non-crystalline phase of MoO3 is (1-0.77) and (1-0.73) times of the MoO3 content in MoO3/ZrO2 and MoO3/V2O5. For MoO3/WO3, the non-crystalline phases of WO3 and MoO3 are as monolayer and 3-4 layers respectively, when the content of both oxides exceeds the threshold value, the increment of non-crystalline phase is (1-0.78) and (1-0.54) times respectively. The selectivity of MoO3/ZrO2 ,MoO3/V2O5 and MoO3/WO3 for o-xylene oxidation is closely related to the surface amorphous Mo-O-Zr, Mo-O-V and Mo-O-W,
【Fund】: 国家自然科学基金
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