Oxidation of aromatic alcohols in irradiated aqueous suspensions of commercial and home-prepared ruffle TiO2:: A selectivity study

被引：124

作者：

Augugliaro, Vincenzo ^{[1
]}

Caronna, Tullio ^{[2
]}

Loddo, Vittorio ^{[1
]}

Marci, Giuseppe ^{[1
]}

Palmisano, Giovanni ^{[1
]}

Palmisano, Leonardo ^{[1
]}

Yurdakal, Sedat ^{[1
,3
]}

机构：

[1] Univ Palermo, Schiavello Grillone Photocatalysis Grp, Dipartimento Ingn Chim Proc & Mat, I-90128 Palermo, Italy

[2] Univ Bergamo, Fac Ingn, I-24044 Bergamo, Italy

[3] Anadolu Univ, Fen Fak, TR-26470 Eskisehir, Turkey

来源：

CHEMISTRY-A EUROPEAN JOURNAL | 2008年 / 14卷 / 15期

关键词：

alcohols; oxidation; photocatalysis; rutile; selectivity;

D O I：

10.1002/chem.200702044

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The photocatalytic oxidation of benzyl alcohol (BA) and 4-methoxybenzyl alcohol (MBA) has been performed in pure water by using commercial TiO2 samples (Sigma-Aldrich, Merck, Degussa P25) and rutile TiO2 prepared from TiCl, at low temperature. Particular attention has been devoted to the identification of the produced aromatic compounds along with the formed CO,. Oxidation products such as the corresponding aromatic aldehyde and acid, as well as mono- and dihydroxylated aldehydes have been detected. The home-prepared rutile sample showed a marked selectivity towards the formation of the aromatic aldehyde (38 and 60% for BA and MBA, respectively), resulting in a three- to sevenfold improvement relative to commercial samples, with the only byproduct being CO2. This catalyst was found to be the most selective in the formation of aldehyde in water. By using the commercial or the calcined home-prepared samples, many hydroxylated aromatic compounds were detected besides the aldehyde and the acid. This finding points to a higher selectivity performance of the home-prepared rutile relative to the commercial TiO2 samples. Some of the home-prepared samples were also dialysed to check the influence of the presence of Cl- species on catalyst reactivity and selectivity. We have attempted to explain the different reaction rate and selectivity observed for MBA and BA.

引用

页码：4640 / 4646

页数：7

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