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Cattail (Typha angustifolia) flower-derived porous carbons as support of electroplated Ni and Cu catalysts for hydrogenation of methyl levulinate to γ-valerolactone
(2023-09-01)
Kaewtrakulchai, Napat
;
Gunpum, Wachiraporn
;
Fuji, Masayoshi
;
Eiad-Ua, Apiluck
The novel synthesis of carbon-supported metal catalysts was completely developed by using electroplating technique. A carbon support was prepared from cattail (Typha angustifolia) flowers (CF) as a bio-material precursor through a hydrothermal process combined carbonization. The prepared carbons exhibited a high surface area, porosity, and excellent electrical conductivity, which is relevant characteristics to materials utilized for metal catalyst supporter. In this study, electroplating technique has been applied for the catalyst synthesis to utilize in hydrogenation of methyl levulinate to γ-valerolactone. Interesting experimental parameters in electroplating such as metal precursors (Ni and Cu), solution temperatures (40, 45, 50, 55, and 60 °C), and applied voltages (3.0, 3.5. 4.0, 4.5, and 5.0 V) were thoroughly investigated on some characteristics of catalysts. The physicochemical properties of studied catalysts were comprehensively characterized by using high-resolution scanning electron microscopy (HRSEM) equipped with energy dispersive spectroscopy (EDS) and focused ion beam (FIB), X-ray diffraction (XRD), and nitrogen sorption analyzer to examine surface morphology, elemental compositions, distribution of the metal in cross-section surface, crystallinity, and textural pore characteristic, respectively. In electroplating process, the solution temperature of 50 °C with the applied voltage of 4 V become an optimal condition for the synthesis of catalyst with uniformed metallic phase and high metal dispersion on carbon support. Ni-carbon and Cu-carbon catalysts exhibited an excellent catalytic activity with the methyl levulinate conversion of 32.68% and 29.17%, respectively.
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Influence of hydrothermal-carbonization process on biochar properties from cattail weed waste
(2019-01-01)
Smuthkochorn, Araya
;
Katunyoo, Nardnutda
;
Kaewtrakulchai, Napat
;
Atong, Duangduen
;
Soongprasit, Kanit
Biochars have been successfully synthesized from Cattail leave (CL) via hydrothermal and carbonization process. The experimental work described has focused on physical properties of biochars produced from Cattail leaves at 160, 180 and 200°C for 8, 12 and 24 h for hydrothermal and substituted to carbonization at 700°C for 2 h. The influences of hydrothermal and carbonization on the pore structure, surface functional groups and the product yield was also investigated by characterization using Scanning Electron Microscope (SEM) and Fourier Transform Infrared Spectroscopy, respectively. Although the morphologies of cell structures were maintained in the hydrothermal and carbonization, it was found that the yield of produced biochar was decreased with increase of the hydrothermal temperature and time. The images from SEM showed that the pore structures are quite roughness on their external surface of biochar and the functional group of their surface area has most of pure carbon content (59-65 wt%).
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Influence of hydrothermal and calcination process on metakaolin from natural clay
(2018-09-05)
Srilai, Suphada
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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.
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Characterization of carbon fibers from Thai horse manure via hydrothermal carbonization
(2018-01-01)
Wettayavong, Sorakit
;
Sangnoi, Siwakron
;
Kaewtrakulchai, Napat
;
Eiad-Ua, Apiluck
Carbon fibers from biomass have been successfully prepared via hydrothermal-carbonization and activated in air atmosphere for catalyst supporter. In this research, we study the effect of temperature (160-200 °C) and residence time (4-24 h) to pretreat the initial carbon precursor in terms of chemical properties (i.e. carbon content, surface functional group) including the physical properties such as porosity and total surface areas. Afterwards, carbonization was obtained at the temperature of 300 °C for 2h for developing the porosity and even removing the contaminants of hydrothermal char to reach the carbon fiber. Nevertheless, carbon fiber was characterized. Scanning electron microscopy (SEM) and Functional Transform Infrared spectroscopy (FTIR) were employed to characterize physical morphology and functional group on the surface, respectively.

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