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Author: search.filters.author.Fuji, MasayoshiSubject: search.filters.subject.Kaolin

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    Influence of crystallization time for synthesis of zeolite a and zeolite x from natural kaolin
    (2019-01-01)
    Srilai, Suphada
    ;
    Tanwongwan, Worapak
    ;
    Onpecth, Kobchai
    ;
    Wongkitikun, Thanapat
    ;
    Panomsuwan, Gasidit
    Zeolite A and zeolite X were successfully synthesized from natural kaolin from Lampang province using calcination and a two-step hydrothermal method. First, metakaolin was obtained by calcining the kaolin at 700 °C for 2 h. Hydrothermal experiments can be separated into two types, being high temperature and short time or lower temperature long time. For high temperature hydrothermal treatment, metakaolin was mixed with NaOH to form hydrous sodium aluminosilicate. This was dissolved in dilute HCl. After filtration, the pH was adjusted with deionized water to pH = 7. This formed an amorphous aluminosilicate gel. For low temperature and longtime hydrothermal treatment aluminosilicate gel was mixed with NaOH to form zeolite A and zeolite X. The optimum condition for the first step in the synthesis of zeolite A is high temperature and short time of hydrothermal treatment with NaOH 8 M at 200 °C for 3 hours. This is followed by low temperature and longtime of hydrothermal treatment with NaOH 1 M carried out at 90 °C for 72 hours. The optimum conditions for the first step of synthesis of zeolite X is the high temperature, short time hydrothermal treatment with NaOH 8 M at 200 °C for 3 hours and low temperature, longtime hydrothermal treatment with NaOH 1 M at 90 °C for 120 hours. The characterizations of zeolite A and zeolite X were carried out by x-ray diffraction (XRD), scanning electron microscopy (SEM), and infrared spectroscopy (FT-IR).
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    Zeolite P from kaolin via hydrothermal method
    (2018-09-05)
    Eiad-Ua, Apiluck
    ;
    Amnaphiang, Phanwasa
    ;
    Asawaworarit, Panuruj
    ;
    Houngkamhang, Nongluck
    ;
    Chollacoop, Nuwong
    Zeolite P has been successfully synthesized from natural kaolin via two step hydrothermal process. The natural kaolin from Lampang, Thailand was studied for this research. In first hydrothermal, kaolin was mixed with sodium hydroxide solution at 200 <sup>o</sup>C for different reaction times from 3 - 5 hours, respectively.Sodium hydroxide and hydrochloric acid were added into the mixture to adjust their pH before they were formed into gel. Second hydrothermal process, the gel was kept of 90 <sup>o</sup>C for 3 days to obtain zeolite P. Synthesized zeolite P was characterized by X-ray diffraction (XRD) for identification the type and crystallization. Besides, the morphology was characterized by scanning electron microscopy)SEM.(The functional group was characterized by Fourier-transform infrared spectroscopy (FTIR). From this study, it was found that the increasing of reaction time in first hydrothermal activation and hydrochloric acid concentration lead to the high quality of zeolite P.
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    Influence of hydrothermal and calcination process on metakaolin from natural clay
    (2018-09-05)
    Srilai, Suphada
    ;
    Kaewtrakulchai, Napat
    ;
    Panomsuwan, Gasidit
    ;
    Fuji, Masayoshi
    ;
    Eiad-Ua, Apiluck
    In this study, metakaolin was synthesized from natural clay from Lampang province via hydrothermal and calcination process. The hydrothermal process was studied at different temperature from 160°C, 180°C and 200°C for 4, 8 and 12 hours. The calcination process was studied at different temperature from 500 to 900°C for 2 hours. Regarding the characterization, physical morphology of resulting products was observed by scanning electron microscope showing that the surface of resulting product was enhanced its surface area with more roughness when the temperature was increased. Moreover, FT-IR spectroscopy was applied for the chemical structure analysis indicating that Lampang clay can be transformed into metakaolin using hydrothermal at 200°C for 8 hours followed by the calcination at 800°C and 900°C as well as through the most condition for this studied. The improvement of the surface area of metakaolin leads to high metal dispersion for catalytic activity of the catalyst.