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Abstract:
The mechanisms of the oxide syntheses to PMo12 and PVMo11 were enlightened by in situ UV/VIS and 31P-NMR. Different solution stabilities of the products were discovered. After several crystalline phase transformations of the solid at higher temperatures (> 573 K) spectroscopic assignments for defect HPA formation were determined. Water supports reversible restructuring into the intact Keggin structure. As a consequence we propose a model concept for a solid repair cycle of the catalyst.
