Abstract
31P MAS NMR spectra of trimethylphosphane (TMP) adsorbed on monoclinic zirconia (ZrO2) and on tetragonal sulfated zirconia (ZrO2−S) were measured. The 31P NMR spectra show that protonic acidity, which does not exist on ZrO2, is induced on ZrO2−S. Lewis acid centers on ZrO2−S are stronger than those on ZrO2. The formation of trimethylphosphane oxide was also detected, indicating oxidizing properties of ZrO2−S that sulfate-free ZrO2 does not possess. ESR spectra suggest the formation of SO3- radical anions during TMP oxidation.
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