Photoreduction of carbon dioxide by hydrogen over magnesium oxide

Kohno, Yoshiumi; Ishikawa, Haruka; Tanaka, Tsunehiro; Funabiki, Takuzo; Yoshida, Satohiro

doi:10.1039/b008887k

Cited by 102 publications

(61 citation statements)

References 29 publications

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“…Ye and coworkers [271] demonstrated that the surface modification of TiO 2 with NaOH could greatly enhance the CO 2 adsorption, activation, thus leading to highly effective photoreduction of CO 2 into CH 4 without loading any noble metal co-catalysts. Kohno et al [272,273] reported that the photocatalytic reduction of CO 2 to CO can be achieved over MgO. However, the mechanism of the photoreduction of CO 2 on MgO cannot be explained by the conventional band theory because MgO is not a semiconductor [272].…”

Section: Increased Basic Sites For Co 2 Adsorptionmentioning

confidence: 99%

Design and fabrication of semiconductor photocatalyst for photocatalytic reduction of CO2 to solar fuel

et al. 2014

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The shortage of fossil fuels and the disastrous pollution of the environment have led to an increasing interest in artificial photosynthesis. The photocatalytic conversion of CO 2 into solar fuel is believed to be one of the best methods to overcome both the energy crisis and environmental problems. It is of significant importance to efficiently manage the surface reactions and the photo-generated charge carriers to maximize the activity and selectivity of semiconductor photocatalysts for photoconversion of CO 2 and H 2 O to solar fuel. To date, a variety of strategies have been developed to boost their photocatalytic activity and selectivity for CO 2 photoreduction. Based on the analysis of limited factors in improving the photocatalytic efficiency and selectivity, this review attempts to summarize these strategies and their corresponding design principles, including increased visible-light excitation, promoted charge transfer and separation, enhanced adsorption and activation of CO 2 , accelerated CO 2 reduction kinetics and suppressed undesirable reaction. Furthermore, we not only provide a summary of the recent progress in the rational design and fabrication of highly active and selective photocatalysts for the photoreduction of CO 2 , but also offer some fundamental insights into designing highly efficient photocatalysts for water splitting or pollutant degradation. INTRODUCTIONThe shortage of the energy supply and the problem of disastrous environmental pollution have been recognized as two main challenges in the near future [1]. It is a better way to efficiently and inexpensively convert solar energy into chemical fuels by developing an artificial photosynthetic (APS) system because solar fuels are high density energy carriers with long-term storage capacity. The most important and challenging reactions in APS-the photocatalytic water splitting into H 2 and O 2 (water reduction and oxidation) [2][3][4] and photoreduction of CO 2 to solar fuel, such as CH 4 and CH 3 OH [5,6] have been extensively studied since the photocatalytic water splitting on TiO 2 electrodes was discovered by Honda and Fujishima in 1972 [7]. The photocatalytic reduction of CO 2 by means of solar energy has attracted growing attention in the recent years, which 1 State Key Laboratory of Advanced Technology for Material Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China 2 College of Science, South China Agricultural University, Guangzhou 510642, China 3 Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia * Corresponding author (email: jiaguoyu@yahoo.com) is also believed to be one of the best methods to overcome both global warming and energy crisis [8]. However, it is also generally thought that photocatalytic CO 2 reduction is a more complex and difficult process than H 2 production due to preferential H 2 production and low selectivity for the carbon species produced [9,10]. The progress achieved in the photoreduction of CO 2 is still far behind that in wate...

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Section: Increased Basic Sites For Co 2 Adsorptionmentioning

confidence: 99%

Design and fabrication of semiconductor photocatalyst for photocatalytic reduction of CO2 to solar fuel

et al. 2014

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“…Concurrent studies using identically prepared crystals in a different cell and using ZnSe windows and an MCT detector allowed for the inspection of the crystals for the suspected reaction between MgO and CO 2 to form MgCO 3 by probing the spectra for the carbonate features, bands centered at 1660 and 1310 cm -1 (ref 23). At no time during this series of experiments were any carboncontaining features seen in any of the IR spectra.…”

Section: Methodsmentioning

confidence: 99%

Adsorption of Methanol on the MgO(100) Surface: An Infrared Study at Room Temperature

Rudberg

Foster

2004

J. Phys. Chem. B

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Methanol adsorbed on the (100) face of MgO has been studied at room temperature and elevated methanol pressures using transmission Fourier transform infrared spectroscopy. From these investigations, we find evidence of two structures for the adsorbed methanol. At low coverages, the methanol molecules congregate into two-dimensional islands that are strongly associated with the substrate. The properties of this submonolayerto-monolayer thin film are similar to those of solid methanol. Once the available surface sites are occupied and a complete monolayer has formed, the methanol begins to condense in multilayers, creating a thin film on the surface with properties similar to liquid methanol.

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“…There are manu studies that have tried to reduce CO 2 under irradiation using several photocatalysts [90][91][92][93][94][95][96][97][98]. We found that Rh/TiO 2 , MgO, ZrO 2 and Ga 2 O 3 enable the reduction of CO 2 to proceed at room temperature and ambient pressure [99][100][101][102][103][104][105][106][107][108]. Here, the detail of the photoreduction of CO 2 over MgO and ZrO 2 is described in the following sections.…”

Section: Chemical Fixation and Photocatalytic Reduction Of Carbon Diomentioning

confidence: 94%

“…MgO exhibited photocatalytic activity for the reduction of CO 2 to CO using H 2 or CH 4 as a reductant [106,107]. After 5 h of photoirradiation using CH 4 as a reductant, the amount of evolved CO reached 3.6 lmol.…”

Section: Photoreduction Of Co 2 With H 2 or Ch 4 On Mgomentioning

confidence: 99%

Photo-Induced Electron Transfer Between a Reactant Molecule and Semiconductor Photocatalyst: In Situ Doping

2011

Self Cite

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The possibility of the direct electron transition between the donor/acceptor level generated by adsorbed molecules and the conduction/valence band for photoilluminated semiconductor-type metal oxide is discussed. The effective wavelength is shifted to a longer wavelength by the formation of donor/acceptor level derived from adsorbed molecule (called here ''in situ doping''). This photo-activation mechanism by ''in situ doping'' gives us attractive ways for the removing the limit of band-gap energy, and the utilization of visible light.

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Photoreduction of carbon dioxide by hydrogen over magnesium oxide

Cited by 102 publications

References 29 publications

Design and fabrication of semiconductor photocatalyst for photocatalytic reduction of CO2 to solar fuel

Design and fabrication of semiconductor photocatalyst for photocatalytic reduction of CO2 to solar fuel

Adsorption of Methanol on the MgO(100) Surface: An Infrared Study at Room Temperature

Photo-Induced Electron Transfer Between a Reactant Molecule and Semiconductor Photocatalyst: In Situ Doping

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