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Author: search.filters.author.Thungngern, PimpreeyaSubject: search.filters.subject.Kaolin

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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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    Influence of temperature and alkaline activation for synthesis zeolite a from natural kaolin
    (2017-01-01)
    Thungngern, Pimpreeya
    ;
    Amnaphiang, Phanwatsa
    ;
    Asawaworarit, Panuruj
    ;
    Goodwin, Vituruch
    ;
    Chollacoop, Nuwong
    Zeolite A from natural kaolin have been successfully synthesized via calcination and hydrothermal. However, these techniques have one drawback since, the impurities in kaolin such as muscovite and quartz in the kaolin structure, which depend on temperature and alkaline activation. This work was separated into two steps, first step was used calcination technique, and second step was used hydrothermal technique. Reaction of temperature in the first step was studied the influence of temperature from 500°C to 800°C for 3 hours. In this step, kaolin transformed to metakaolin and remain the impurities. Next, reaction of alkaline activation in second step was studied about the influence of NaOH. The concentration of NaOH in hydrothermal was varied from 1M to 4M and mixed with metakaolin at 90°C for 72 hours. X-ray Diffraction Spectroscopy (XRD), Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR) were used for characterization. The solid products were formed to zeolite A at 1M NaOH hydrothermal with 500oC to 800oC calcination and it can be seemed good of euhedral structure at 700oC.