Abstract
We found that Keggin-type phosphometalates are effective catalysts for solvent-free oxidation with urea–H 2O 2 by dispersing on fluorapatite solid phase. In the solid phase system the phosphomolybdate (NH 4) 3PMo 12O 40 was more effective than the phosphotungstate (NH 4) 3PW 12O 40, whereas the latter was much superior to the former in the liquid-phase reaction with aqueous H 2O 2. In situ formation of novel peroxo-type species from (NH 4) 3PMo 12O 40/FAp and urea–H 2O 2, which may lead to the high catalytic activity in the solid phase system, was observed by 31P solid-state NMR.
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