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Photocatalytic conversion of carbon dioxide to methane on TiO_2/CdS in aqueous isopropanol solution

Park, Hyunwoong and Ou, Hsin-Hung and Kang, Unseock and Choi, Jina and Hoffmann, Michael R. (2016) Photocatalytic conversion of carbon dioxide to methane on TiO_2/CdS in aqueous isopropanol solution. Catalysis Today, 266 . pp. 153-159. ISSN 0920-5861. https://resolver.caltech.edu/CaltechAUTHORS:20160415-112408335

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Abstract

The photocatalytic conversion of CO_2 to CH_4 on hybrid TiO_2/CdS catalysts in water in the presence of isopropanol (IPA) was explored. As compared to TiO_2, TiO_2/CdS increased the production of CH_4 by a factor of ∼10, whereas the production of H_2 and CO remained comparable. The amount of CdS loaded on the TiO_2 was not observed to significantly affect the yields and distributions of the products. An electron impact time-of-flight mass spectrometry (TOF-MS) study revealed ^(13)CH_4 to be a dominant product in the early stages of the photocatalysis under ^(13)CO_2 atmosphere, whereas only ∼25% of the total observed methane accounted for ^(13)CH_4 resulting from ^(13)CO_2 in the prolonged photocatalytic reaction over 6 h. Although the remainder of the methane originated from unlabeled carbons (e.g., from ^(12)C-IPA and ^(12)C-organic contaminants), the use of deuterated IPA in the TOF-MS study did not provide evidence for the contribution of the methyl groups of IPA. Furthermore, the diffuse reflectance infrared Fourier transform analysis showed the adsorption of aquated CO_2 species (e.g., (bi)carbonate via mono- and bi-dentate modes at pH ∼4.5) to be enhanced by the coupling of CdS to TiO_2, which was found to significantly weaken after the reactions. On the other hand, the IPA-associated IR bands were influenced to a lesser extent by the photoreaction.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.cattod.2015.09.017DOIArticle
http://www.sciencedirect.com/science/article/pii/S092058611500591XPublisherArticle
ORCID:
AuthorORCID
Park, Hyunwoong0000-0002-4938-6907
Hoffmann, Michael R.0000-0001-6495-1946
Alternate Title:Photocatalytic conversion of carbon dioxide to methane on TiO2/CdS in aqueous isopropanol solution
Additional Information:© 2015 Elsevier B.V. Received 20 April 2015, Revised 4 September 2015, Accepted 11 September 2015, Available online 2 November 2015.
Subject Keywords:Artificial photosynthesis; Electron donor; Isotope; Diffuse reflectance infrared Fourier transform; Carbon dioxide radical anion
Record Number:CaltechAUTHORS:20160415-112408335
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20160415-112408335
Official Citation:Hyunwoong Park, Hsin-Hung Ou, Unseock Kang, Jina Choi, Michael R. Hoffmann, Photocatalytic conversion of carbon dioxide to methane on TiO2/CdS in aqueous isopropanol solution, Catalysis Today, Volume 266, 15 May 2016, Pages 153-159, ISSN 0920-5861, http://dx.doi.org/10.1016/j.cattod.2015.09.017. (http://www.sciencedirect.com/science/article/pii/S092058611500591X)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:66220
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:15 Apr 2016 19:40
Last Modified:09 Mar 2020 13:19

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