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

Yuni K. Krisnandi; Russell F. Howe

doi:10.1016/j.apcata.2006.03.008

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

Yuni K. Krisnandi, Russell F. Howe

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

28 Citations (Scopus)

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.

Original language	English
Pages (from-to)	62-69
Number of pages	8
Journal	Applied Catalysis A: General
Volume	307
Issue number	1
DOIs	https://doi.org/10.1016/j.apcata.2006.03.008
Publication status	Published - 12 Jun 2006

Keywords

ETS-10
Ethene oxidation
Photocatalysis
Photoreduction

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10.1016/j.apcata.2006.03.008

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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, Ethene oxidation, Photocatalysis, Photoreduction",

author = "Krisnandi, {Yuni K.} and Howe, {Russell F.}",

note = "Funding Information: This work was supported by the University of Aberdeen and by the Donors of the Petroleum Research Fund of the American Chemical Society. Y.K. also acknowledges award of a UK Overseas Research Studentship. ",

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AU - Howe, Russell F.

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PY - 2006/6/12

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N2 - 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.

AB - 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.

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KW - Ethene oxidation

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KW - Photoreduction

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

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