12－钨磷酸钯盐催化机理研究

The Study of Acid-Catalysed Mechanism of Palladium 12-Tungstophosphorate

１２一钨磷酸钯盐与母体酸１２一钨磷酸一样具有酸催化活性．几种典型酸催化反应中把盐的催化活性分两种类型：第一类反应中不需要氢气还原便产生酸催化活性，且活性寿命长；第二类反应中有氢气存在活性才显著，活性寿命得以延长．根据ＩＲ谱推测钠盐产生Ｂ酸中心的机理可以是氢还原Ｐｄ２＋离子，也可以是Ｐｄ２＋分解结晶水而产生质子．

PdPW (Palladium 12-Tungstophosphorate) has acid-catalysed activityies as its mother-acid HPW (12-Tungstophoshporic acid). In the several typical acid-catalysed reactions eatalystic activities of PdPW have been divided into two types. In first type of acid-catalysed reactions,activity can be produced without H reduction. Active temperature is generally lower and life of activity is longer. In second type of acid-catalysed reactions,active temperature is higher and the surface of catalyst is easily deposited carbon. The activity of PdPW in this type is only notable in the existance of H and its active life can be prolonged. According. to IR spectra of PdPW absorbed Prydin.The mechanism of PdPW producing activity can be either to reduce Pd by H or to decompose water by PdPW.