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Author: search.filters.author.Chollacoop, NuwongSubject: search.filters.subject.Calcination

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    Effect of mixing of carbon support from sawdust and sugarcane bagasse by hydrothermal carbonization for synthesis of molybdenum disulfide (MoS2) catalyst
    (2018-01-01)
    Sumtong, Peerawith
    ;
    Goodwin, Vituruch
    ;
    Chollacoop, Nuwong
    ;
    Eiad-Ua, Apiluck
    Molybdenum disulfide (MoS<inf>2</inf> ) catalyst on carbon support from varying ratio of sawdust and sugarcane bagasse has been successfully synthesized by hydrothermal carbonization and calcination process. Hydrothermal carbonization of lignocellulosic structure into carbon support is investigated at 200<sup>o</sup> C for 24 hr and calcination at 600<sup>o</sup> C for 2 hr. The precursor of MoS<inf>2</inf> catalyst is prepared using thiourea (CH<inf>4</inf> N<inf>2</inf> S) and ammonium molybdate tetrahydrate ((NH<inf>4</inf> )<inf>6</inf> Mo<inf>7</inf> O<inf>24</inf><sup>.</sup> 4H<inf>2</inf> O) loaded on carbon support. The lignocellulosic structure as hemicellulose and cellulose is changed at high temperature via hydrothermal carbonization and calcination. The distribution of molybdenum disulfide on carbon support is varied based on morphology and functional group of carbon support. The morphology and functional group were analyzed using Scanning Electron Microscope (SEM) and Fourier Transform Infrared Spectroscopy (FTIR). It shows that carbon support at equal ratio (1:1) of sawdust and sugarcane bagasse is an optimum ratio with high distribution of molybdenum disulfide catalyst on carbon support.
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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.