Sooknoi, Tawan

Preferred name

Sooknoi, Tawan

Alternative Name

Sooknoi, T.

Main Affiliation

School of Science

tawan.so@kmitl.ac.th

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Synthesis, preparation and catalytic activities of V-doped TiO2 gel coating on porous α-Al2O3 beads
(2007-01-01)
Jaroenworaluck, A.
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Panyathanmaporn, T.
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Soontornworajit, B.
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Supothina, S.
;
Tawkaew, S.
TiO<inf>2</inf> and V-doped TiO<inf>2</inf> gel were synthesized and coated onto porous α-Al<inf>2</inf>O<inf>3</inf> beads to study the thermal catalytic activities of oxidation reactions. Titanium isopropoxide (Ti(OPr) <inf>4</inf>) and 1,2-butadiol(Bu(OH)<inf>2</inf>) were used as starting chemicals for preparation of TiO<inf>2</inf> gel without V-doping. After aging at ambient temperature for one week, a TiO<inf>2</inf> gel was obtained. The concentration of Ti(OPr)<inf>4</inf> was varied, 0.2, 0.3, 0.7 and 2.4 M was used. For V-doping of the TiO<inf>2</inf> gel, 0.05, 0.20 and 0.75 mole% of V was prepared by ultrasonically dissolving vanadium acetylacetone (V(acac) <inf>2</inf>) in 1,2-butadiol. The solutions were then added to Ti(OPr) <inf>4</inf>. Finally, the mixed solutions were kept under ambient temperature for one week to form the V-doped TiO<inf>2</inf> gel. TiO<inf>2</inf> and V-doped TiO<inf>2</inf> were calcined at 300, 400, 500, 600, 700, and 800°C. XRD analysis, SEM and TEM in conjunction with EDS analysis were used to identify the phases present, grain size and morphology. The TiO<inf>2</inf> grains have a particle size in the nano-scale range. Doping TiO<inf>2</inf> with V could retard growth of the TiO<inf>2</inf> particles and affect phase transformation at higher calcination temperatures. Both the TiO<inf>2</inf> and V-doped TiO<inf>2</inf> gels were prepared and coated onto α-Al <inf>2</inf>O<inf>3</inf> beads to test oxidation reactions in a purpose-designed reactor. The results of the catalytic reactions indicated that V-doped TiO<inf>2</inf> had a higher oxidation activity than the undoped TiO<inf>2</inf> gel. The content of vanadium was related to the reaction efficiency.
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Improvement of water vapor permeability of LLDPE/EVA film with zeolite A as filler
(2017-01-01)
Rukchonlatee, Suparat
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Jaisomboon, Nattarika
;
Sooknoi, Tawan
In this work, water vapor permeability of linear low density polyethylene (LLDPE)/ethylene vinyl acetate copolymer (EVA) film is improved by incorporation of zeolite A as filler (0-25%wt) for prolonging shelf-life of fresh produces. All films were characterized by SEM, DSC, tensile testing, contact angle measurement and tested for water vapor permeability (WVP). The shelf-life of Bird's eye chili in the film samples was also tested at 10°C for 21 days. It was found that zeolite A particles were virtually dispersed in EVA phase. Accordingly, crystallinity and tensile properties of LLDPE/EVA/Zeolite A films is independent to zeolite loading. Despite, when zeolite loading was increased, the dispersion became low. The film's wetting behavior was enhanced by increasing zeolite content in the LLDPE/EVA/Zeolite A films. The observed increase in the film's polarity significantly enhances the WVP. Therefore, less water condensed can be found inside the package made with LL80E20Ze25 film, as compared to LLDPE or LLDPE/EVA film. The LL80E20Ze25 also possesses comparable tensile properties to the commercial LLDPE film and hence can used as packaging for extending the shelf-life of fresh produces.
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Etherification of 2-methyl-pentanal on supported palladium
(2009-12-01)
Pham, Trung T.
;
Crossley, Steven P.
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Sooknoi, Tawan
;
Lobban, Lance L.
;
Resasco, Daniel E.
Dialkyl ethers can be selectively produced from etherification of 2-methyl-pentanal and other oxygenates on supported Pd catalysts. Selectivities of 90% of ether were observed when feeding 2-methyl-pentanal and 2-methyl-pentanol at a molar ratio 1:1. Yields of up to 79 % have also been achieved. The reaction appears to be sensitive to metal particle features and molar feed ratios.
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Deoxygenation of model biofuel compounds over CsNaX zeolite catalyst
(2008-12-01)
Danuthai, Tanate
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Peralta, Maria A.
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Sooknoi, Tawan
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Osuwan, Somchai
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Lobban, Lance L.
The deoxygenation of methyl octanoate and benzaldehyde over CsNaX zeolite catalyst has been investigated as a model for reactions for production of hydrocarbon fuels from bio-oxygenates. The CsNaX zeolite used in the study was prepared by ion exchange of NaX with a CsNO<inf>3</inf>/CsOH solution to a 50% exchange level. The decarbonylation activity, selectivity, and stability of the CsNaX catalyst were enhanced when methanol was co-fed for the reaction of methyl octanoate. TPD studies suggest that methyl octanoate first decomposes to an octanoate-like species. The decomposition of such species leads to the formation of heptenes and hexenes as major products. Octenes and hydrogenated products are formed in lesser amounts via hydrogenation / hydrogenolysis using hydrogen produced on the surface from methanol decomposition, but not from gas phase H<inf>2</inf>.
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Oligomerization of propionaldehyde on novel basic catalysts
(2008-12-01)
Amen, Q. V.
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Sooknoi, T.
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Lobban, L. L.
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Mallinson, R. G.
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Resasco, Daniel E.
Vapor-phase oligomerization of propanal to 2-methyl-2-pentenal and 2-ethyl-3,5-dimethylcyclo-2-pentenone over basic zeolite catalysts (NaX, KNaX, KX, and CsNaX), as well as more traditional solid basic catalysts (MgO and MgO-Al2O3 hydrotalcites), was studied in an integral flow reactor at atmospheric pressure. Conversion and carbon yield based on catalyst properties (basicity, acidity) are reported. The highest stable activity was over KX, with the highest selectivity to the primary product, 2-methyl-2-pentenal (dehydrated aldol dimer of propanal) and the second highest selectivity to the secondary product, 2-ethyl-3,5-dimethylcyclo-2-pentenone (a non-aromatic cyclic trimer), with essentially no other products. Promotion of Zeolite X with various alkali metals also affected the acid and base site strengths, which had an effect on the conversion and selectivity.
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Conversion of propylene and propanal on HZSM-5
(2009-12-01)
Hoang, Trung Q.
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Zhu, Xinli
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Sooknoi, Tawan
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Resasco, Daniel E.
;
Lobban, Lance L.
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Ag-doped TiO2 immobilized on Al2O3 bead as oxidation catalyst
(2007-01-01)
Panyathanmaporn, Thammarat
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Jaroenworaluck, Angkhana
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Supothina, Sitthisuntorn
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Chumnanklang, Rung Arun
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Juengsuwattananon, Kannikar
Ag-doped TiO<inf>2</inf> catalyst employed as the oxidation catalyst candidate was prepared by two methods, co-precipitation and dip coating method. Co-precipitation method was conducted by adding AgNO<inf>3</inf> into the titanium precursor before gelation and then the obtained solution was coated on the alumna beads. Dip coating method was conducted by coating the first layer on alumina beads with titanium precursor followed by coating the second layer with AgNO<inf>3</inf>. The fired Ag-doped TiO<inf>2</inf> coated on alumina beads was used as catalyst for catalytic oxidation of methanol and carbon monoxide by using oxygen as oxidizing agent in a gas-phase reactor. The methods of catalyst preparation were found to affect the catalytic efficiency. Dip coating method showed better oxidation reaction as Ag-doped TiO<inf>2</inf> catalysts were well dispersed on the alumina beads.
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Catalytic deoxygenation of benzaldehyde over supported gallium catalysts
(2008-12-01)
Ausavasukhi, Artit
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Resasco, Daniel E.
;
Sooknoi, Tawan
The deoxygenation of benzaldehyde was investigated over supported Ga catalysts as part of a program leading to the study of model reactions involving aldehydes, acids, furfurals, and oxygenated aromatics that may be present in pyrolysis oil (bio-oil). Ga/SiO<inf>2</inf> catalysts were prepared by impregnating precipitated SiO<inf>2</inf> supports with Ga(NO<inf>3</inf>) <inf>3</inf> solution. The reaction conditions, H<inf>2</inf> concentration, Ga content, and Ga dispersion in the catalysts were varied to investigate the effect of these parameters on activity, selectivity, and stability. TPR gave evidence for a partial reduction of Ga/SiO<inf>2</inf> in the range 500-750 °C. Increasing H<inf>2</inf> concentration (3-100%v/v) was found to enhance activity (∼50-90%) and toluene selectivity (40-75%). Reaction at low temperature (< 500 °C) leads to the formation of high molecular weight oxygenates and consequently rapid catalyst deactivation (< 2 h). In contrast, no benzaldehyde conversion can be observed over a physical mixture of Ga <inf>2</inf>O<inf>3</inf> and SiO<inf>2</inf>.
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Ag-doped TiO2 immobilized on Al2O3 bead as oxidation catalyst
(2007-01-01)
Jaroenworaluck, Angkhana
;
Supothina, Sitthisuntorn
;
Chumnanklang, Rung Arun
;
Juengsuwattananon, Kannikar
;
Jinawath, Supatra
Ag-doped TiO<inf>2</inf> catalyst employed as the oxidation catalyst candidate was prepared by two methods, co-precipitation and dip coating method. Co-precipitation method was conducted by adding AgNO<inf>3</inf> into the titanium precursor before gelation and then the obtained solution was coated on the alumna beads. Dip coating method was conducted by coating the first layer on alumina beads with titanium precursor followed by coating the second layer with AgNO<inf>3</inf>. The fired Ag-doped TiO<inf>2</inf> coated on alumina beads was used as catalyst for catalytic oxidation of methanol and carbon monoxide by using oxygen as oxidizing agent in a gas-phase reactor. The methods of catalyst preparation were found to affect the catalytic efficiency. Dip coating method showed better oxidation reaction as Ag-doped TiO<inf>2</inf> catalysts were well dispersed on the alumina beads.
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A textile waste water treatment system using photocatalytic reactor and catalyst recycle unit
(2007-01-01)
Tawkaew, Sittinun
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Sooknoi, Tawan
;
Jaroenworaluck, Angkhana
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Panyatbanrnaporn, Thammarat
;
Supothina, Sitthisuntorn
A photocatalytic system for wastewater treatment from textile industries was constructed and tested for its efficiency. The system consisted of two units - a photoreactor for dye decomposition and a catalyst recovery unit. The photoreactor was an annular plug flow photoreactor under irradiation of 36 W Toshiba blacklight. The catalyst recovery unit was 42 L of sediment tank for TiO<inf>2</inf> catalyst recovery. In our study, a Cibra Cron red R-W 150% (an anionic azo dye) was used to prepare a synthetic textile wastewater. The experimental parameters such as flow rate, pH, dye initial concentration, catalyst loading and setteled time that affected the system performance were investigated. The photodegradation kinetics were found to follow the Langmuire - Hinshelwood model and also depended on the TiO<inf>2</inf> concentration and the pH. The optimum condition for photocatalytic decomposition was at pH 3 and at 1 g/L of TiO<inf>2</inf> catalyst loading. The reaction rate constant, k and the adsorption constant, K for the scale-up photoreactor were 3.345 mg/L-min and 0.0204 L/mg, respectively. For the catalyst recycle unit, the overflow and underflow concentration of the TiO<inf>2</inf> catalyst were 2.00 and 0.002 mg/L, respectively, at 100 ml/min of inlet flow rate, 50 ml/min of overflow and 50 ml/min of underflow.

Sooknoi, Tawan

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