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Open AccessArticle

Reactor Design for CO2 Photo-Hydrogenation toward Solar Fuels under Ambient Temperature and Pressure

Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
Faculty of Chemical and Environmental Engineering, Lac Hong University, 812431, No. 10 Huynh Van Nghe, Buu Long, Bien Hoa, Dong Nai, Viet Nam
Chung-Shan Institute of Science and Technology, Tao Yuan 32599, Taiwan
Institute of Environmental Technology, VŠB-Technical University of Ostrava, 17. listopadu 15/2172, 708 33 Ostrava-Poruba, Czech Republic
Author to whom correspondence should be addressed.
Academic Editor: Rajendra S. Ghadwal
Catalysts 2017, 7(2), 63;
Received: 27 December 2016 / Revised: 6 February 2017 / Accepted: 8 February 2017 / Published: 16 February 2017
(This article belongs to the Special Issue Small Molecule Activation and Catalysis)
Photo-hydrogenation of carbon dioxide (CO2) is a green and promising technology and has received much attention recently. This technique could convert solar energy under ambient temperature and pressure into desirable and sustainable solar fuels, such as methanol (CH3OH), methane (CH4), and formic acid (HCOOH). It is worthwhile to mention that this direction can not only potentially depress atmospheric CO2, but also weaken dependence on fossil fuel. Herein, 1 wt % Pt/CuAlGaO4 photocatalyst was successfully synthesized and fully characterized by ultraviolet-visible light (UV-vis) spectroscopy, X-ray diffraction (XRD), Field emission scanning electron microscopy using energy dispersive spectroscopy analysis (FE-SEM/EDS), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Brunauer-Emmett-Teller (BET), respectively. Three kinds of experimental photo-hydrogenation of CO2 in the gas phase, liquid phase, and gas-liquid phase, correspondingly, were conducted under different H2 partial pressures. The remarkable result has been observed in the gas-liquid phase. Additionally, increasing the partial pressure of H2 would enhance the yield of product. However, when an extra amount of H2 is supplied, it might compete with CO2 for occupying the active sites, resulting in a negative effect on CO2 photo-hydrogenation. For liquid and gas-liquid phases, CH3OH is the major product. Maximum total hydrocarbons 8.302 µmol·g−1 is achieved in the gas-liquid phase. View Full-Text
Keywords: CO2 reduction; Pt/CuAlGaO4; photo-hydrogenation; photocatalysis; solar fuels CO2 reduction; Pt/CuAlGaO4; photo-hydrogenation; photocatalysis; solar fuels
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MDPI and ACS Style

Chen, C.-Y.; Yu, J.C.-C.; Nguyen, V.-H.; Wu, J.C.-S.; Wang, W.-H.; Kočí, K. Reactor Design for CO2 Photo-Hydrogenation toward Solar Fuels under Ambient Temperature and Pressure. Catalysts 2017, 7, 63.

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