Air and vacuum dehydrations of SiMo12 and PMo12 heteropoly acids (HPA) have been studied, the sequence of Mo5+ signals detected under various conditions allowing the evaluation of different stages in the dehydration and destruction of the HPA. The stability of the HPA is shown to decrease when they are supported on Aerosil. The strong interaction of the HPA with an alumina support both influences and modifies properties characteristic of the HPA.
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Fricke et al. (1986) studied this question.
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