Browsing by Author "Napat Kaewtrakulchai"

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    Dependence of MWCNT production via co-pyrolysis of industrial slop oil and ferrocene on growth temperature and heating rate
    (2020-09-01) Weerawut Chaiwat; Napat Kaewtrakulchai; Pimpage Sangsiri; Apiluck Eiad-ua; Winadda Wongwiriyapan; Nawin Viriya-empikul; Komkrit Suttiponpanit; Tawatchai Charinpanitkul; PTT Public Company Limited; Chulalongkorn University; King Mongkut's Institute of Technology Ladkrabang; Thailand National Nanotechnology Center; Mahidol University; Research Network of NANOTEC-KU on Nanocatalyst and Nanomaterials for Sustainable Energy and Environment
    © 2020 Elsevier B.V. Multi-walled carbon nanotubes (MWCNTs) could be produced from industrial slop oil via pyrolysis with the presence of ferrocene. Dependence of characteristics of the produced MWCNTs on their growth temperature and heating rate of mixtures of industrial slop oil and ferrocene was experimentally investigated. With low-molecular weighted hydrocarbon, the resultant MWCNTs with nominal diameters of 10–50 nm and yields of 45–65 wt% could be produced within a growth temperature range of 750–950 °C. Meanwhile, high-molecular weighted hydrocarbon could provide substantial yield of MWCNTs only within the growth temperature range of 850–950 °C. It was found that a higher heating rate of 9 °C/min could result in preferable production of MWCNTs with higher purity. Based on comprehensive analyses, a schematic pathway of MWCNT production via co-pyrolysis of mixtures of industrial slop oil and ferrocene was proposed.
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    Synthesis of nanoporous material from lignin via carbonization assisted acid activation
    (2020-01-01) Nutchaporn Ngamthanacom; Napat Kaewtrakulchai; Weerawut Chaiwat; Laemthong Chuenchom; Masayoshi Fuji; Apiluck Eiad-Ua; King Mongkuts University of Technology; Nagoya Institute of Technology; Mahidol University; Prince of Songkla University
    © 2020 Trans Tech Publications Ltd, Switzerland. Waste lignin (WL) from the pulp mill and paper was studied for its potential application to prepare the nanoporous carbon with high porosity via carbonization assisted acid activation. The effect of acid activation such as HNO3, HCl, H2SO4, and H3PO4 on lignin transformation to nanoporous carbon investigated. The physicochemical properties of nanoporous carbon were comprehensively characterized through N2 sorption, Scanning electron microscope (SEM), X-ray diffraction (XRD), and Fourier transform infrared (FTIR), respectively. N2 sorption revealed that the condition using 5% vol of phosphoric acid activation at carbonization temperature of 700°C for 2 h exhibited the highly porous structure of carbon nanoparticles with a total pore volume of 0.035 cm3 /g. With the properly selecting process variables of waste lignin development could be producing high porosity nanoporous carbon.