氧化铌结构和酸性关系的研究
Investigation of Relationship of Niobium Oxides Structure and Acidity
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摘要: 用不同制备方法获得了具有单一结构的氧化铌表面；①具有NbO结构；②具有NbO4四面体结构；③具有NbO6八面体结构。用高分辨电子能量损失谱（HREELS）、俄歇电子能谱（AES）、紫外光电子能谱（UPS）和离子散射谱（ISS）研究了氧化铌表面结构和酸性的关系，四面体结构的NbO4表面带有强的Lewis酸性。甲醇分子在两种表面上为解离吸附，尤其在具有NbO4结构的氧化铌表面上生成甲氧基最大。在具有NbO6结构的氧化铌表面上只能发生甲醇的分子吸附。Abstract: Three order niobium oxide surface were prepered by different mothods:1.NbO structure.2.NbO4 tetrahedral structure.3.NbO6 octahedral structure.The relaction of niobium oxide surface structures and acidity had been investigated by HREELS,AES,UPS and ISS.Methanol dissociatively adsorbed on the NbO and NbO4 surface,but only the molecular adsorption of methanol was observed on NbO6 surface.
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