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在无机含氧酸中,Si Mo W V 的含氧酸容易发生缩合反应而生成缩合酸。由同种合氧酸缩含而形成的缩合酸叫同多酸,由不同种类的含氧酸缩合而形成的缩合酸叫杂多酸。杂多酸(Hoteropoly acid 以下简记 HPA)及其盐用作催化剂是催化领域中一种新趋势。杂多酸具有许多特殊的性质:其组份比较简单,结构确定,兼具络合物和金属氧化物的主要结构特征;HPA 是多电子氧化剂,同时又是强质子酸,其氧化性和酸性可通过改变组成的方式来调变,这有利于催化剂设计;许多 HPA 都易溶于水和含氧有机溶剂,
Among the inorganic oxo acids, oxoacids of Si Mo W V are prone to condensation reaction to form condensed acids. The condensation acid formed by the condensation of the same kind of oxo acids is called homopolyacid, and the condensation acid formed by condensation of different kinds of oxo acids is called heteropolyacid. The use of heteropolyacid (HPA) and its salts as a catalyst is a new trend in the field of catalysis. Heteropolyacid has many special properties: its composition is relatively simple, the structure is confirmed, both the main structural characteristics of complexes and metal oxides; HPA is a multi-electron oxidant, is also a strong proton acid, its oxidation and acidity Modulation can be made by changing the composition, which favors catalyst design; many HPAs are readily soluble in water and oxygenated organic solvents,