Y. Leng, Hanqing Ge, Changjian Zhou
Dec 15, 2008
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Influential Citations
61
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Journal
Chemical Engineering Journal
Abstract
Abstract The hybrid catalysts, pyridine (Py) modified molybdovanadophosphates with Keggin structure Py n –PMo (12− m ) V m O 40 ( n = 1–3, m = 1–3), were prepared and characterized by FT-IR. Among various catalysts, Py 1 –PMo 10 V 2 O 40 exhibited the highest yield of phenol (20.5%) with the selectivity of phenol of 98.0% at 353 K for 5 h in the direct hydroxylation of benzene to phenol with H 2 O 2 in the acetic acid and acetonitrile (volume ratio 1:1) mixed solvent. Pyridine plays an important role in the promotion of the catalytic activities, mostly due to the electronic interaction between pyridine and heteropolyacid together with the more remarkable pseudo-liquid-phase behavior. The influences of the reaction temperature, the amount of H 2 O 2 , the amount of Py 1 –PMo 10 V 2 O 40 and the reaction time on the yield of phenol were investigated to obtain the optimal reaction conditions for phenol formation.