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Type: Journal article
Title: Optimum molar ratio of H₂ and H₂O to reduce CO₂ using Pd/TiO₂
Other Titles: Optimum molar ratio of H(2) and H(2)O to reduce CO(2) using Pd/TiO(2)
Author: Nishimura, A.
Inoue, T.
Sakakibara, Y.
Hirota, M.
Koshio, A.
Kokai, F.
Hu, E.
Citation: AIMS Materials Science, 2019; 6(4):464-483
Publisher: AIMS Press
Issue Date: 2019
ISSN: 2372-0484
Statement of
Akira Nishimura, Tadaki Inoue, Yoshito Sakakibara, Masafumi Hirota, Akira Koshio, Fumio Kokai, and Eric Hu
Abstract: This study investigated the optimum moral ratio of CO₂ and reductants H₂O and H₂ to obtain high CO₂ reduction performance of Pd/TiO₂ photocatalyst. The Pd/TiO₂ film photocatalyst is prepared by sol-gel and dip-coating process to form TiO₂ film and by pulse arc plasma method to dope Pd. The prepared Pd/TiO₂ film was characterized by SEM, EPMA and EELS. The impact of overlapping two Pd/TiO₂ films on CO₂ reduction performance was also investigated to utilize the light and prepared photocatalyst more effectively. Moreover, this study investigated the characteristics of Pd/TiO₂ film to reduce CO₂ under the illumination condition of Xe lamp with or without ultraviolet (UV) light. It is found when the moral ratio of CO₂/H₂/H₂O is set at 1:0.5:0.5, the best CO₂ reduction performance has been obtained under the illumination conditions of Xe lamp with and without UV light. It is revealed that the moral quantity of CH₄ per weight of photocatalyst for overlapped Pd/TiO₂ film is 8.14 μmol/g for the moral ratio of CO₂/H₂/H₂O of 1:0.5:0.5 under the illumination condition of Xe lamp with UV light, which is approximately 1.1 times larger than that for one Pd/TiO₂ film. It can be concluded that the optimum moral ratio of CO₂/H₂/H₂O, for the CO₂ reduction reaction, is 1:0.5:0.5.
Keywords: Pd/TiO₂ photocatalyst; CO₂ reduction; overlapping effect; reductant
Rights: © 2019 the Author(s), licensee AIMS Press. This is an open access article distributed under the terms of the Creative Commons Attribution License (
DOI: 10.3934/matersci.2019.4.464
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