Effects of ion-exchange on the photoreactivity of ETS-10

被引：25
作者：
Krisnandi, Yuni K.
Howe, Russell F. [1 ]
机构：
[1] Univ Aberdeen, Dept Chem, Aberdeen AB24 3UE, Scotland
[2] Univ Indonesia, FMIPA, Dept Chem, Depok 16424, Indonesia
来源：
APPLIED CATALYSIS A-GENERAL | 2006年 / 307卷 / 01期
关键词：
ETS-10; photocatalysis; photoreduction; ethene oxidation;
D O I：
10.1016/j.apcata.2006.03.008
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
This paper describes an investigation by EPR spectroscopy and FTIR spectroscopy of the reactivity of ETS-10 photocatalysts subjected to different ion exchange treatments. Trapped photoelectrons can be detected only in ion-exchanged samples which have been damaged as a result of the ion exchange procedure. UV-irradiation of such samples in the presence of adsorbed organic molecules that scavenge photogenerated holes forms Ti3+ ions, which transfer the electron to oxygen to form superoxide O-2- on subsequent addition of O-2(-) Superoxide ions are also formed when damaged samples are irradiated in O-2. As-synthesised (undamaged) samples of ETS-10 are not photo-reduced when irradiated in the presence of adsorbed organic molecules, but do catalyse a novel photo-polymerisation of ethene; the activity for this reaction depends on the level of stacking faults in the ETS-10. Photo-oxidation of ethene to adsorbed carbonyl compounds occurs most extensively in ion exchanged samples; this is attributed to the generation of photocatalytic sites on the external surface of the ETS-10 as a result of the damage caused by ion exchange. (c) 2006 Elsevier B.V. All rights reserved.
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页码：62 / 69
页数：8
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