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Characterization of Ti-Beta zeolites and their reactivity for the photocatalytic reduction of CO_2 with H_2O

Ikeue, Keita and Yamashita, Hiromi and Takewaki, Takahiko and Davis, Mark E. and Anpo, Masakazu (2001) Characterization of Ti-Beta zeolites and their reactivity for the photocatalytic reduction of CO_2 with H_2O. Journal of Synchrotron Radiation, 8 (2). pp. 602-604. ISSN 0909-0495. https://resolver.caltech.edu/CaltechAUTHORS:20160913-103841039

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Abstract

A characterization of Ti-Beta zeolites synthesized under various conditions as well as an investigation of their photocatalytic properties for the reduction of CO_2 with H_2O at 323 K to produce CH_4 and CH_3OH were carried out. In situ XAFS spectra measurements indicated that a highly dispersed tetrahedral titanium oxide species was present in the zeolite framework and an increase in the coordination number of the titanium oxide species by the addition of H_2O and CO_2 molecules could be detected. The Ti-Beta zeolite having a hydrophilic property (Ti-Beta(OH)) exhibited a more dramatic increase in the coordination number than the Ti-Beta(F) zeolite which had a hydrophobic property. These results suggest that CO_2 and H_2O molecules can be adsorbed efficiently onto the highly dispersed tetrahedrally coordinated titanium oxide species. UV irradiation of these Ti-Beta zeolite catalysts in the presence of H_2O and CO_2 led to the formation of CH_4 and CH_3OH. Ti-Beta(OH) exhibited a higher reactivity than Ti-Beta(F), while the selectivity for the formation of CH_3OH on Ti-Beta(F) was higher than that for Ti-Beta(OH). These results indicated that the reactivity and selectivity of the zeolite catalyst can be determined by the hydrophilic and hydrophobic properties of the zeolites.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1107/S0909049500014394DOIArticle
http://scripts.iucr.org/cgi-bin/paper?S0909049500014394PublisherArticle
Additional Information:© 2001 International Union of Crystallography.
Subject Keywords:in-situ XAFS, Photocatalyst, Ti-Beta, CO2
Issue or Number:2
Record Number:CaltechAUTHORS:20160913-103841039
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20160913-103841039
Official Citation:Ikeue, K., Yamashita, H., Takewaki, T., Davis, M. E. & Anpo, M. (2001). J. Synchrotron Rad. 8, 602-604
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:70303
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:21 Sep 2016 20:11
Last Modified:03 Oct 2019 10:29

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