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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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Synthesis of nanoporous material from lignin via carbonization assisted acid activation
(2020-01-01)
Ngamthanacom, Nutchaporn
;
Kaewtrakulchai, Napat
;
Chaiwat, Weerawut
;
Chuenchom, Laemthong
;
Fuji, Masayoshi
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.
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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 acid-treatment on waste lignin for synthesis of carbon nanoparticles
(2019-01-01)
Ngamthanacom, Nutchaporn
;
Kaewtrakulchai, Napat
;
Chaiwat, Weerawut
;
Chuenchom, Laemthong
;
Fuji, Masayoshi
Waste lignin (WL) obtained from paper mills, was studied for its potential application in preparing carbon nanoparticles (CNPs) with high porosity. This was done by impregnation of 0, 5, 10 and 20% concentrations of phosphoric acid under various carbonization temperatures (600, 700, 800 and 900°C). The physicochemical properties of CNPs were characterized through nitrogen sorption, X-ray diffraction (XRD), Scanning electron microscopy (SEM), and Fourier transforms infrared spectroscopy (FTIR). Nitrogen sorption revealed that the condition using 10% concentration of phosphoric acid treatment at a carbonization temperature of 700°C formed carbon nanoparticles with a highly porous structure (Surface area 27.65 m2 /g and pore volume 0.07 cm3 /g). Additionally, in order to high surface area, porosity and concentrated carbon nanoparticle.

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