【摘要】 以硫酸为支持电解质 ,在水 - 1 ,4-二氧六环混合溶剂中 ,用循环伏安法研究了自制的两个系列 Keggin结构和 Dawson结构的 1 0种杂多酸的氧化还原特性 ,分析了钼和钒的氧化还原能力和可逆性 ,讨论了不同钒含量对磷钼钒酸的氧化还原性的影响 .结果表明 ,Dawson结构的磷钼酸氧化性强于 Keggin结构的磷钼酸 ;不论是 Keggin结构还是 Dawson结构的磷钼钒酸 ,随着钒含量的增加 ,钒和钼的氧化还原可逆性都越来越差 ,为 Dawson结构磷钼酸和磷钼钒酸的鉴定提供了有效证据 .更多还原

【Abstract】 The oxidition-reduction behaviour of Keggin and Dawson types of molybdophosphoric heteropolyacids and molybdovanadophosphoric heteropolyacids was studied by cyclic voltammetry in the mixed solvent of water-dioxane containing supporting electrolyte, （0.1） mol/L H₂SO₄. The ability and reversibility of the oxidation-reduction of molybdenum and vanadium were analyzed. The influence of vanadium content on the oxidation-reduction behaviour of the molybdovanadophosphoric heteropolyacids was also discussed. The ability of the oxidation-reduction of Dawson type of the molybdophosphoric heteropolyacids is stronger than that of Keggin type of the molybdophosphoric acids. The reversibilities of the oxidation-reduction of molybdenum and vanadium became worse both for the Keggin and Dawson types of the molybdovanadophosphoric heteropolyacids with the increase of vanadium content. The characteristic fingerprint of these compounds allows us to distinguish the Dawson type molybdophosporic heteropolyacids from the molybdovanadophosphoric heteropolyacids.更多还原