Journal of the Japan Institute of Energy
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ONLINE ISSN: 1882-6121
PRINT ISSN: 0916-8753

Journal of the Japan Institute of Energy Vol. 101 (2022), No. 3

  • Thermal Behavior of Crystalline Minerals in Argonne Premium Coals under Air and Argon Atmospheres: Comparison between Bituminous, Sub-bituminous, and Brown Coals

    pp. 36-42

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    DOI:10.3775/jie.101.36

    Recently, we have reported that the needle-like crystals appeared under the different heat treatments between Upper Freeport (UF) and Illinoi#6 bituminous coals. In this study, we investigated the change in the behavior of ash components of UF bituminous coal, Wyodak-Anderson (WD) sub-bituminous coal, and Beulah-Zap (BZ) brown coal with treatment temperature and atmosphere by XRD, TG-DTA, and TEM measurements. Anhydrite, quartz, and hematite were observed for WD heat-treated up to 1000 °C under air atmosphere. The peak of anhydrite for WD was stronger than others at all temperatures. This can be attributed to the difference in the SO3 content in the ash. A part of anhydrite in WD and BZ changed to gehlenite by heat treatment up to 1200 °C, while anhydrite was observed for UF heat-treated. It seems that this would be due to the difference in Ca content. Troilite formed by the reduction of pyrite was observed under argon treatment for coals other than WD. The cubic shape crystals observed in the TEM image in WD and BZ heat-treated at 1200 °C under air atmosphere could be gehlenite from the XRD data.
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  • Modification of SiO2-Al2O3 Supported TiO2 for Photocatalytic Reduction of CO2 to Methanol

    pp. 43-49

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    DOI:10.3775/jie.101.43

    The photocatalytic reduction of carbon dioxide into methanol over modified SiO2-Al2O3 supported TiO2 catalyst at atmospheric pressure was investigated. The SiO2-Al2O3 supported TiO2 catalyst was modified by coating the bimetallic metal (Ni-Cu) using the sol-gel method with various Ni-Cu loading in the range of 0wt.% to 5wt.%. All prepared catalysts were characterized using Scanning electron microscopy (SEM), X-ray powder diffraction (XRD), N2 adsorption-desorption, UV-vis diffuse reflectance spectrometer (UV-Vis-DRS), and Photoluminescence Spectroscopy (PL). The reaction was performed in a liquid-phase batch-reactor equipped with a UVC lamp (125W) as a source of UV radiation. The reactions were tested at atmospheric pressure and the temperature of 25 °C for 5 h with a catalyst loading of 4 g/L. It was found that the coating of bimetallic metal had effects on the reduction of surface area and energy bandgap. The prepared catalyst had a surface area in the range 108 m2/g to 199.6 m2 /g, and the bandgap energy varied from 3.01 eV to 3.08 eV. The presence of Ni (3wt.%) and Cu (2wt.%) on the TiO2/SiO2-Al2O3 catalyst had slower recombination rate of electron-hole pairs than that of TiO2/SiO2-Al2O3 catalyst. The highest methanol production rate of 405.08 µmol/gcat was obtained after 2 h over 3wt.%Ni-2wt.%Cu-TiO2/SiO2-Al2O3. This production rate was three times higher than that over unmodified TiO2/SiO2-Al2O3 due to good retardation of electron-hole pair recombination.
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  • Photocatalytic Reduction of CO2 into Hydrocarbon over Cu-TiO2/SiO2-Al2O3 Catalyst

    pp. 50-55

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    DOI:10.3775/jie.101.50

    This research aimed to study the photocatalytic reduction of CO2 into methanol over TiO2 supported on SiO2-Al2O3 catalysts. The effects of reaction time and the influence of copper (1-4 %wt) doped on SiO2-Al2O3 on the methanol yield were investigated. The experiments were carried out in a 50 ml batch reactor under UV irradiation. The catalysts prepared by the sol-gel method were characterized by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The result indicated that the maximum of methanol production was obtained after the irradiation of 2 h and slightly reduced after that, probably due to the methanol oxidation process. The highest methanol production of 1258.8 µmol gcat-1 was obtained when 2%wt Cu-TiO2/SiO2-Al2O3 catalyst. This was 5.98 times that obtained from the undoped photocatalyst. The presence of the CuO phase could separate the electron from the TiO2 conduction band to move into the CuO conduction band. However, the high content of CuO could increase the TiO2 crystal size. Moreover, the catalysts could be reused seven times for the purpose. Therefore, the result of this research indicated the potential of using Cu with TiO2/SiO2-Al2O3 catalyst for reducing CO2 emission to the environment.
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  • Tableof Contents (in English)

    p. Tce3_1

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    DOI:10.3775/jie.101.Tce3_1

  • Tableof Contents (in Japanese)

    p. Tcj3_1

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    DOI:10.3775/jie.101.Tcj3_1

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