Thongkam, Montree

Preferred name

Thongkam, Montree

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School of Science

montree.th@kmitl.ac.th

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A double-shell capsule catalyst with core-shell-like structure for one-step exactly controlled synthesis of dimethyl ether from CO2 containing syngas
(2011-08-10)
Yang, Guohui
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Thongkam, Montree
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Vitidsant, Tharapong
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Yoneyama, Yoshiharu
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Tan, Yisheng
A zeolite capsule catalyst Cr/ZnO-S-Z was prepared successfully by a novel dual-layer method, in which one layer of neutral Silicalite-1 zeolite shell was first synthesized on the bimetallic Cr/ZnO core catalyst, acting as the intermediate layer for the following H-type H-ZSM-5 zeolite shell direct synthesis on its surface. By using this dual-layer method, it can be easily realized that the formation of H-ZSM-5 zeolite membrane on the millimeter-sized bimetallic substrates. Direct synthesis of dimethyl ether (DME) from syngas at higher reaction temperature was the application of this zeolite capsule catalyst to test its catalytic performance. In reaction, this zeolite capsule catalyst could realize the exactly controlled synthesis of DME, suppressing the formation of other alkane/alkene by-products simultaneously, demonstrating its exclusive ability for the selective synthesis of target product compared with the conventional hybrid catalyst. © 2011 Elsevier B.V. All rights reserved.
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Electrical and optical properties of p-type CuFe1-xSn xO2 (x = 0.03, 0.05) delafossite-oxide
(2013-01-14)
Ruttanapun, Chesta
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Boonchom, Banjong
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Thongkam, Montree
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Kongtaweelert, Samart
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Thanachayanont, Chanchana
The CuFe<inf>1-x</inf>Sn<inf>x</inf>O<inf>2</inf> (x = 0.03, 0.05) delafossite samples have been synthesized by a solid-state reaction to investigate electrical and optical properties of the transparent conducting oxide materials. Crystal structure was characterized by XRD. The electrical conductivity and Seebeck coefficient were measured in the high temperature range of 300 to 960 K, while the Hall coefficient, XPS, and UV-VIS-NIR spectra were analyzed at room temperature. The XRD peaks of the samples indicate the delafossite structure phase, and the XPS spectra reveal the stable Sn 2+-doping state. The Seebeck and Hall coefficient display a positive sign indicating the p-type conducting oxide. The optical allowed direct gap is 3.45 eV as a visible-transparent material. The activation energies for polaron hopping between Sn2+ sites and Fe3+ sites of 36 and 32 meV are obtained from the samples having x = 0.03 and 0.05, respectively. The CuFe<inf>1-x</inf>Sn<inf>x</inf>O<inf>2</inf> delafossite oxide compounds, of which the Fe3+ sites in the CuFeO<inf>2</inf> are substituted by the Sn2+ ions, are p-type transparent conducting oxide materials. The activation energy is found to decrease with an increased in Sn content. © 2013 American Institute of Physics.
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Extraction of Chitin, Chitosan, and Calcium Acetate from Mussel Shells for Sustainable Waste Management
(2025-08-01)
Seangarun, Chaowared
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Seesanong, Somkiat
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Boonchom, Banjong
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Laohavisuti, Nongnuch
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Rungrojchaipon, Pesak
In this paper, mussel shells were used to produce chitin, chitosan, and calcium acetate using chemical processes, searching for an alternative environmentally friendly biopolymer and calcium source. Mussel shells were treated with acetic acid as a demineralizing agent, resulting in separate solid fractions and calcium solution. The solid was further purified to produce chitin by deproteinization and decolorization processes, and then the deacetylation process was used to obtain chitosan. The calcium solution was evaporated to produce calcium acetate powder. The yields of extracted chitin, chitosan, and calcium acetate from 100 g of mussel shells were 2.98, 2.70, and 165.23 g, respectively. The prepared chitin, chitosan, and calcium acetate were analyzed by Fourier transform infrared (FTIR) spectrophotometry, X-ray diffraction (XRD), thermogravimetric analysis (TGA), and scanning electron microscope (SEM) to confirm the chemical and physical properties. The analysis results of chitin and chitosan revealed the similarity to chitosan derived from crustaceans and insects in terms of functional group, structure and morphologies. The prepared calcium acetate shows FTIR and XRD data corresponding to calcium acetate monohydrate (Ca(CH<inf>3</inf>COO)<inf>2</inf>·H<inf>2</inf>O) similar to synthesized calcium acetate in previous research. In addition, the mineral contents of calcium acetate identified by X-ray fluorescence (XRF) analysis exhibit 97.8% CaO with non-toxic impurities. This work demonstrated the potential of the production process of chitin, chitosan, and calcium acetate for the development of a sustainable industrial process with competitive functional performance against the commercial chitin and chitosan production process using crustacean shells and supported the implementation of a circular economy.
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A Facile Method to Synthesize b-Oriented Silicalite-1 Thin Film
(2022-05-01)
Thongkam, Montree
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Woramongkolchai, Somsak
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Saowsupa, Sairoong
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Rungrojchaipon, Pesak
Silicalite-1 thin film was prepared with the following batch composition—3TPAOH:25TEOS: 1450H<inf>2</inf> O:100EtOH—and synthesized using the hydrothermal technique. Silicalite-1 colloidal crystals were successfully coated on the surface of the silica substrate by the dip-coating method. The investigation of silicalite-1 thin film with organic structure-directing agents (SDA), using a seeding technique with various colloidal seed concentrations, number of dip-coating steps, and crystallization time, were systematically discussed and obtained interesting results. Silicalite-1 powder and Silicalite-1 membrane, the patterns of which showed a unique characteristic crystallography of MFI topology, were characterized by XRD, which indicated the preferred orientation along the b-axis perpendicular to the substrate surface. The morphology and crystal size aspect of Silicalite-1 were also examined by a scanning electron microscope (SEM).
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Non-isothermal decomposition kinetics of synthetic serrabrancaite (MnPO4 · H2O) precursor in N2 atmosphere
(2010-01-01)
Boonchom, Banjong
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Danvirutai, Chanaiporn
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Thongkam, Montree
The thermal decomposition of synthetic serrabrancaite (MnPO<inf>4</inf> · H<inf>2</inf>O) was studied in N<inf>2</inf> atmosphere using TG-DTG-DTA. Thermal analysis results indicate that the decomposition occurs in two stages, which are assigned to the dehydration and the reduction processes and the final product is Mn<inf>2</inf>P<inf>2</inf>O<inf>7</inf>. X-ray powder diffraction, FT-IR and FT-Raman techniques were used for identification of the solid decomposition product. The decomposition kinetics analysis of MnPO <inf>4</inf> · H<inf>2</inf>O was performed under non-isothermal condition through isoconversional methods of Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS). The dependences of activation energies on the extent of conversions are observed in the dehydration and the reduction reactions, which could be concluded the "multi-step" processes. © Akadémiai Kiadó, Budapest, Hungary 2009.
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Vitrimer-like of poly (glycerol sebacate) by using zinc acetate, zinc oxide and Amberlyst as catalysts
(2023-01-01)
Thongkam, Montree
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Saowsupa, Sairoong
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Rungrojchaipon, Pesak
Polyglycerol sebacate (PGS) is elastomeric biodegradable polymer with potential biomedical and green packaging applications. This study focuses on the synthesis of vitrimer-like PGS utilizing various catalysts, including Zinc acetate, Zinc oxide and Amberlyst-15. The investigation of vitrimer-like of PGS polymer by polycondensation of glycerol and sebacic acid with various molar ratio of 1:1, 1:1.25 and 1:1.5 will be studied. The synthetic time and temperature were controlled at 72 h, 120 °C, respectively. The prepolymer of PGS had a weight-average molecular weight (Mw.) of 1743. The result of functional group was confirmed by Fourier transforms Infrared spectroscopy (FTIR). The intense C[dbnd]O stretch at 1737 cm−1 confirms the formation of ester bonds. The intense OH stretch at 3454 cm−1 indicated hydroxyl groups from hydrogen bonded. When the quantity of catalyst is increased, the results of hardness are rising but swelling (%) becomes lower. The results showed a polymer network has higher cross-link when the catalyst increases. In addition, the proton nuclear magnetic resonance spectroscopy (1H NMR) analysis found that PGS using catalyst does not have peaks of glycerol.
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A Well-Defined Core–Shell-Structured Capsule Catalyst for Direct Conversion of CO2 into Liquefied Petroleum Gas
(2020-04-21)
Li, Hangjie
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Zhang, Peipei
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Guo, Lisheng
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He, Yingluo
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Zeng, Yan
A Pd/SiO<inf>2</inf>@S1@H-ZSM-5 capsule catalyst (Pd/SiO<inf>2</inf>–SZ) is fabricated through a dual-layer crystal growth method with an auxiliary hydrothermal reaction. The catalyst exhibits excellent selectivity to liquefied petroleum gas (LPG) in CO<inf>2</inf> hydrogenation reactions, which is attributed to the tandem reactions of methanol synthesis on the Pd/SiO<inf>2</inf> core catalyst and methanol dehydration to hydrocarbons on the H-ZSM-5 shell. The Pd/SiO<inf>2</inf>–SZ capsule catalyst has a similar mesoporous structure, narrow range of Pd particles size distribution, and consistent reduction characteristics to the Pd/SiO<inf>2</inf> core catalyst. It maintains the physical and chemical properties of the core catalyst throughout the H-ZSM-5 shell synthesis process. Energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy results reveal that the H-ZSM-5 zeolite shell completely encapsulates the Pd/SiO<inf>2</inf> core catalyst. Compared with the crushed capsule catalyst (Pd/SiO<inf>2</inf>–SZP), the well-defined-structured Pd/SiO<inf>2</inf>–SZ catalyst has a much higher LPG selectivity of 33.6 %, owing to the well-matched reactions at the Pd/SiO<inf>2</inf> core and H-ZSM-5 shell.
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A simple route to synthesize new binary cobalt iron cyclotetraphosphate CoFeP4O12 using aqueous and acetone media
(2009-11-03)
Boonchom, Banjong
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Thongkam, Montree
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Kongtaweelert, Samart
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Vittayakorn, Naratip
A new binary cobalt iron cyclotetraphosphate, CoFeP<inf>4</inf>O<inf>12</inf> was synthesized through solid phase reaction using cobalt carbonate, iron metal and phosphoric acid in the presence of water-acetone media with further calcinations at the temperature of 500 °C. The particle size obtained from X-ray line broadening is 65 ± 24 nm for the CoFeP<inf>4</inf>O<inf>12</inf>. FTIR spectrum of CoFeP<inf>4</inf>O<inf>12</inf> is assigned based on the P<inf>4</inf>O<inf>12</inf>4- ion in the structure. The SEM micrograph of the synthesized CoFeP<inf>4</inf>O<inf>12</inf> shows non-uniform microparticle, which is important for specific application. Room temperature magnetization result shows superparamagnetic behavior of the CoFeP<inf>4</inf>O<inf>12</inf> powder, having no hysteresis loop in the range of ±10,000 Oe with the specific magnetization value of 14.243 emu/g. The XRD and FTIR results of the synthesized CoFeP<inf>4</inf>O<inf>12</inf> appear to be very similar to that of M<inf>2</inf>P<inf>4</inf>O<inf>12</inf> (M = Co and Fe), which indicates the monoclinic phase with space group C2/c. © 2009 Elsevier B.V.
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A new synthesis of BaHPO4 precipitated by BaCO3-H4PO4-NaOH system at room temperature
(2013-08-30)
Boonchom, Banjong
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Ruttanapun, Chesta
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Thongkam, Montree
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Chaiyasith, Pachernchaipat
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Woramongkonchai, Somsak
Barium hydrogenphosphate, BaHPO<inf>4</inf> was synthesized for the first time through simple and rapid method using BaCO<inf>3</inf>-H<inf>3</inf>PO<inf>4</inf>-NaOH, pH =9.0 at room temperature for 30 min. The studied BaHPO<inf>4</inf> decomposed in a single well-defined stage via deprotonated hydrogenphosphate reactions, revealed by TG/DTG and DSC techniques. The calculated wavenumbers based on DSC peak were comparable with FTIR results, which support the breaking bonds of P-OH (HPO<inf>4</inf>2-) in the deprotonated hydrogenphosphate reactions. The thermodynamic functions (ΔH*, ΔG*, and ΔS*) for the deprotonated hydrogenphosphate reactions calculated from DSC data indicate that the deprotonated HPO<inf>4</inf>2- reaction occur a lower-energy pathway and spontaneous process. The FTIR, XRD and SEM data of the studied BaHPO<inf>4</inf> and its decomposed product Ba<inf>4</inf>P<inf>2</inf>O<inf>7</inf> are also reported. © (2013) Trans Tech Publications, Switzerland.
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Flower-like microparticles and novel superparamagnetic properties of new binary Co1/2Fe1/2(H2PO4) 2·2H2 O obtained by a rapid solid state route at ambient temperature
(2009-12-01)
Boonchom, Banjong
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Thongkam, Montree
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Kongtaweelert, Samart
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Vittayakorn, Naratip
A new binary Co<inf>1/2</inf>Fe<inf>1/2</inf>(H<inf>2</inf>PO<inf>4</inf>) <inf>2</inf>·2H<inf>2</inf>O was synthesized by a simple, rapid and cost-effective method using CoCO<inf>3</inf>-Fe(c)-H<inf>3</inf>PO<inf>4</inf> system at ambient temperature. Thermal treatment of the obtained Co<inf>1/2</inf>Fe<inf>1/2</inf>(H<inf>2</inf>PO<inf>4</inf>) <inf>2</inf>·2H<inf>2</inf>O at 600 °C yielded as a binary cobalt iron cyclotetraphosphate CoFeP<inf>4</inf>O<inf>12</inf>. The FTIR and XRD results of the synthesized Co<inf>1/2</inf>Fe<inf>1/2</inf>(H<inf>2</inf>PO<inf>4</inf>) <inf>2</inf>·2H<inf>2</inf>O and its final decomposed product CoFeP<inf>4</inf>O<inf>12</inf> indicate the monoclinic phases with space group P2<inf>1</inf>/n and C2/c, respectively. The particle morphologies of both binary metal compounds appear the flower-like microparticle shapes. Room temperature magnetization results show novel superparamagnetic behaviors of the Co<inf>1/2</inf>Fe<inf>1/2</inf>(H<inf>2</inf>PO<inf>4</inf>) <inf>2</inf>·2H<inf>2</inf>O and its final decomposed product CoFeP<inf>4</inf>O<inf>12</inf>, having no hysteresis loops in the range of ±10,000 Oe with the specific magnetization values of 0.045 and 12.502 emu/g at 10 kOe, respectively. The dominant physical properties of the obtained binary metal compounds (Co<inf>1/2</inf>Fe<inf>1/2</inf>(H<inf>2</inf>PO<inf>4</inf>) <inf>2</inf>·2H<inf>2</inf>O and CoFeP<inf>4</inf>O<inf>12</inf>) are compared with the single compounds (M(H<inf>2</inf>PO<inf>4</inf>)<inf>2</inf>·2H<inf>2</inf>O and M<inf>2</inf>P<inf>4</inf>O<inf>12</inf>; where M = Co, Fe), indicating the presence of Co ions in substitution position of Fe ions. © 2009 Elsevier Ltd. All rights reserved.
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Thongkam, Montree

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