A trilacunary keggin phosphotungstic reaction-controlled phase-transfer catalyst [C7H7(CH3)3N]9PW9O34(Q9PW9) was synthesized, the catalyst was characterized by FT-IR, 31P NMR, XRD and TG, and the catalytic center was confirmed. The results of analysis indicated that the structure of catalyst was kept well after reaction, the [C7H7(CH3)3N]9PW9O34 (O2)x formed during reaction made the catalyst had the feature of reaction-controlled phase-transfer catalysis. Q9PW9 was applied to the oxidation of benzyl al-cohol with hydrogen peroxide as the oxidant and high efficient catalytic performance was achieved. When the molar ratio of H2O2 to benzyl alcohol was 0.9, the conversion of benzyl alcohol was 86.2%, the selectiv-ity of benzaldehyde was not less than 99%. After the reaction finished, the catalyst could be recycled from the system easily as deposit, and the catalyst recovery ratio was around 86%. The results of the catalyst re-cycle indicated that the catalyst exhibited high stability.

Key words: phosphotungstate, reaction-controlled phase-transfer, hydrogen peroxide, benzyl alcohol, oxidation