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

Paper ID Volume ID Publish Year Pages File Format Full-Text
44677 46052 2006 8 PDF Available
Title
Effects of ion-exchange on the photoreactivity of ETS-10
Abstract

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 O2− on subsequent addition of O2. Superoxide ions are also formed when damaged samples are irradiated in O2. 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.

Keywords
ETS-10; Photocatalysis; Photoreduction; Ethene oxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 307, Issue 1, 12 June 2006, Pages 62–69
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
You save - $31
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