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The effect of zirconium addition on vanadium-catalyzed toluene oxidation by hydrogen peroxide in acetic acid was studied. 51 V NMR, ESI-MS and DFT calculation were used to characterize the intermediate metal species formed in the reaction. Over high vanadium amount, the addition of Zr is beneficial for benzaldehyde generation and toluene conversion, and the ratio of (benzaldehyde+benzoic acid)/(benzyl...
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