Selective Aerobic Oxidation of Aromatic Alcohols Catalyzed by TiO2: An Insight on the Effect of Surface Fluorination

Abstract:

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To achieve better activity, TiO2 was modified through surface fluorination using hydrofluoric acid (denoted as HF-TiO2). The photocatalytic activities of the as-prepared HF-TiO2 and pure TiO2 photocatalysts were evaluated for selective aerobic oxidation of benzyl alcohol. Experimental results indicated that without any loss of selectivity (>98%), distinct rate enhancement can be observed on HF-TiO2 comparing to pure TiO2. To optimize the condition of pretreatment, different concentrations of hydrofluoric acid were also used and the optimal concentration was determined to be 2%. Moreover, the dynamics of benzyl alcohol oxidation followed pseudo-first-order kinetic. By ESR technique and experiments adding different captures, the active specie is determined to be O2 while O2.- and H2O2 were byproducts of the reaction. In a word, this study opens a new path to obtain both high selectivity and conversion yield by TiO2 photocatalysis.

Info:

Periodical:

Advanced Materials Research (Volumes 113-116)

Edited by:

Zhenyu Du and X.B Sun

Pages:

327-330

DOI:

10.4028/www.scientific.net/AMR.113-116.327

Citation:

Q. Wang "Selective Aerobic Oxidation of Aromatic Alcohols Catalyzed by TiO2: An Insight on the Effect of Surface Fluorination", Advanced Materials Research, Vols. 113-116, pp. 327-330, 2010

Online since:

June 2010

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Price:

$35.00

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