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Author: search.filters.author.Houngkamhang, NongluckSubject: search.filters.subject.Hydrothermal

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    Synthesis of Zeolite Y from Kaolin via hydrothermal method
    (2019-01-01)
    Krongkrachang, Pimpetch
    ;
    Thungngern, Pimpreeya
    ;
    Asawaworarit, Panuruj
    ;
    Houngkamhang, Nongluck
    ;
    Eiad-Ua, Apiluck
    ZeoliteY has been successfully synthesized via a two-step hydrothermal method with kaolin from Lampang province as a precursor. For the first hydrothermal, kaolin with an addition of sodium silicate (NaSi<inf>3</inf>O<inf>7</inf>) or tetraethyl orthosilicate (TEOS) was mixed with sodium hydroxide (NaOH) and autoclaved for 200<sup>o</sup>C at different reaction times for 6, 8 and 10 h, respectively. Sodium hydroxide and hydrochloric acid were added into the compound mixture to adjust its pH before it was formed into gel. After a second time hydrothermal at 90°C for 2 days, the solid product was filtered out, washed by deionized water and dried overnight. The zeolite was then characterized by X-ray diffraction spectroscopy (XRD) to identify type and crystallization, scanning electron microscopy (SEM) for morphology, Fourier transform infrared spectroscopy (FTIR) to identify its functional group and N<inf>2</inf> adsorption to study the adsorption/desorption isotherm and pore distribution. From N<inf>2</inf> adsorption-desorption isotherm, it is revealed that the zeolite obtained by this method have 571 m<sup>2</sup>/g surface area and pore size distribution around 4.89 nm.
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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.