P—V—W 杂多酸及其盐,是七十年代以来在杂多化合物中,研究得最为活跃的一类化合物之一。它的特点是热分解温度高、再生速度快,是有应用前景的一类催化剂。在 P:(V+W)为1:12系列中,盐已全部合成成功,合成方法是偏钨酸盐,偏钒酸盐和钠的磷酸盐三者混合一起用高氯酸酸化。这种合成方法的不足之处是不易制得纯的化合物,且配比偏钒酸钠要极大过量。我们采用改进的方法:按计量比混合 NaVO_3和 Na_2HPO_4,酸化,利用生成的 P-V-W heteropolyacid and its salts, one of the most actively studied compounds in heteropoly compounds since the seventies. It is characterized by high thermal decomposition temperature, regeneration speed, there is a type of catalyst for the future. In P: (V + W) 1: 12 series, the salt has been all synthesized successfully, the synthesis method is metatungstate, metavanadate and sodium phosphate were mixed with three acidification with perchloric acid. The disadvantage of this synthetic method is not easy to obtain pure compounds, and the ratio of sodium metavanadate to a very large excess. We use an improved approach: mixing NaVO_3 and Na_2HPO_4 at a metered ratio, acidifying and utilizing the resulting