Photocatalytic transformation of CO sub(2) to CH sub(4) and CO on acidic surface of TiO sub(2) anatase

Recently, many studies have demonstrated that carbon dioxide can be converted to methane on TiO sub(2) surface by a photocatalytic process. We show that such a photo-reduction can be significantly affected by the presence of an acidic proton in powder samples of titania. Using in situ absorption gas...

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Bibliographic Details
Published in:Optical materials 2016-06, Vol.56, p.80-83
Main Authors: Civis, Svatopluk, Ferus, Martin, Knizek, A, Kubelik, P, Kavan, L, Zukalova, M
Format: Article
Language:English
Subjects:
Carbon dioxide
Carbon monoxide
Derivatives
Formations
Methane
Photocatalysis
Titanium dioxide
Transformations
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Summary:Recently, many studies have demonstrated that carbon dioxide can be converted to methane on TiO sub(2) surface by a photocatalytic process. We show that such a photo-reduction can be significantly affected by the presence of an acidic proton in powder samples of titania. Using in situ absorption gas-phase rovibrational spectroscopic detection of CH sub(4), CO and CO sub(2), we demonstrate that proton enhancement positively affects transformation of intermediate derivatives to methane during the photo-irradiation process via several reactions in which the electron transfer inside titania is coupled to oxygen transfer to the Ti super(3+) centers of TiO sub(2) structure. The yield of CH sub(4) or CO depends on the surface conditioning of titania: the formation of CH sub(4) is boosted by a presence of adsorbed HCl, while the formation of CO is boosted by adsorbed H sub(2)SO sub(4).
ISSN:0925-3467
DOI:10.1016/j.optmat.2015.11.015