Pub Date : 2022-10-15DOI: 10.51316/jst.161.etsd.2022.32.4.2
The 2-benzoylbenzoxazole derivatives were known for their significant biological activities such as anti-proliferative activity, inhibition of FAAH enzyme (fatty acid amide hydrolase). Synthesis of biologically active 2-benzoylbenzoxazole motifs often relies on a multi-step process or precursors carrying active groups. In this study, we report a simple and efficient method for the synthesis of such compounds by the direct reaction of o-aminophenol with acetophenone catalyzed by sulfur in DMSO. The reaction was found to take place via benzoxazolation in the Willgerodt rearrangement of acetophenone, followed by benzylic oxidation to restore the carbonyl functional group. With the optimized reaction conditions, we have synthesized a number of 2-benzoylbenzoxazoles 3aa - 3ae derivatives with good yield from 60 to 75%. Several synthetic derivatives have shown cancer cell growth inhibitory activity with IC50 values ranging from 36.37 to 56.08 µM. The cytotoxicity of some resulting compounds was evaluated and showed that the ellipticine positive control was stable in the experiment.
{"title":"Synthesis and Cytotoxicity Evaluation of 2-Benzoylbenzoxazoles by Reaction of o-Aminophenol with Acetophenone Catalyzed by Sulfur in DMSO","authors":"","doi":"10.51316/jst.161.etsd.2022.32.4.2","DOIUrl":"https://doi.org/10.51316/jst.161.etsd.2022.32.4.2","url":null,"abstract":"The 2-benzoylbenzoxazole derivatives were known for their significant biological activities such as anti-proliferative activity, inhibition of FAAH enzyme (fatty acid amide hydrolase). Synthesis of biologically active 2-benzoylbenzoxazole motifs often relies on a multi-step process or precursors carrying active groups. In this study, we report a simple and efficient method for the synthesis of such compounds by the direct reaction of o-aminophenol with acetophenone catalyzed by sulfur in DMSO. The reaction was found to take place via benzoxazolation in the Willgerodt rearrangement of acetophenone, followed by benzylic oxidation to restore the carbonyl functional group. With the optimized reaction conditions, we have synthesized a number of 2-benzoylbenzoxazoles 3aa - 3ae derivatives with good yield from 60 to 75%. Several synthetic derivatives have shown cancer cell growth inhibitory activity with IC50 values ranging from 36.37 to 56.08 µM. The cytotoxicity of some resulting compounds was evaluated and showed that the ellipticine positive control was stable in the experiment.","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79435309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-15DOI: 10.51316/jst.161.etsd.2022.32.4.6
Natural gas is well known as a promising alternative fuel for internal combustion engine. In this study, a numerical model was built based on the experimental CNG converted engine. Direct injection and port fuel injection method was operated in the model on the same conditions such as design parameter, engine speed, compression ratio. The effect of injection method on engine performance and emission characteristics were compared. The mixing and burning properties were also investigated to have further insight about the fuel injection effects. The results have illustrated that the injection strategy had strongly effects on the mixing and combustion process. Due to the better mixture, the direct injection engine has showed the obviously improvement on the emission as well as engine performance. All these results have provided the data and theory to improve the engine performance for the development of the direct injection system for the engine using CNG.
{"title":"A Study on Performance and Emission Characteristics of Direct Injection Natural Gas Engine","authors":"","doi":"10.51316/jst.161.etsd.2022.32.4.6","DOIUrl":"https://doi.org/10.51316/jst.161.etsd.2022.32.4.6","url":null,"abstract":"Natural gas is well known as a promising alternative fuel for internal combustion engine. In this study, a numerical model was built based on the experimental CNG converted engine. Direct injection and port fuel injection method was operated in the model on the same conditions such as design parameter, engine speed, compression ratio. The effect of injection method on engine performance and emission characteristics were compared. The mixing and burning properties were also investigated to have further insight about the fuel injection effects. The results have illustrated that the injection strategy had strongly effects on the mixing and combustion process. Due to the better mixture, the direct injection engine has showed the obviously improvement on the emission as well as engine performance. All these results have provided the data and theory to improve the engine performance for the development of the direct injection system for the engine using CNG.","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91504694","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-15DOI: 10.51316/jst.159.etsd.2022.32.3.6
Nguyễn Tuấn Nghĩa, Trinh Dac Phong, N. Khoa
This paper presents a study on the effect of the biodiesel ratio on the performance and emissions of diesel engines. The research engine is a cylinder engine AVL-5402 that has been simulated using the software AVL-Boost.Simulated fuels include fossil diesel and biodiesel blended with the replacement rate from 0% to 50%, including B0, B10, B20, B30, B40, and B50, respectively, simulation mode at 1400 rev/min speed for maximum torque value of the engine, at the rate of 25%, 50%, and 75% load. Combustion characteristics, power, fuel consumption, and emissions are to be evaluated based on the proportions of blended biodiesel. The results show that there is a relationship between the proportion of blended biodiesel and the parameters of the engine. Specifically, as the ratio of biodiesel blend increases, peak pressure and rate of heat release decrease while peak temperature increases, the tendency to reduce engine power and increase fuel consumption increases. The emissions of CO and soot are reduced, while NOx is increased.
{"title":"Simulation Study on the Effect of Biodiesel Ratio Derived from Waste Cooking Oil on Performance and Emissions of a Single Cylinder Diesel Engine","authors":"Nguyễn Tuấn Nghĩa, Trinh Dac Phong, N. Khoa","doi":"10.51316/jst.159.etsd.2022.32.3.6","DOIUrl":"https://doi.org/10.51316/jst.159.etsd.2022.32.3.6","url":null,"abstract":"This paper presents a study on the effect of the biodiesel ratio on the performance and emissions of diesel engines. The research engine is a cylinder engine AVL-5402 that has been simulated using the software AVL-Boost.Simulated fuels include fossil diesel and biodiesel blended with the replacement rate from 0% to 50%, including B0, B10, B20, B30, B40, and B50, respectively, simulation mode at 1400 rev/min speed for maximum torque value of the engine, at the rate of 25%, 50%, and 75% load. Combustion characteristics, power, fuel consumption, and emissions are to be evaluated based on the proportions of blended biodiesel. The results show that there is a relationship between the proportion of blended biodiesel and the parameters of the engine. Specifically, as the ratio of biodiesel blend increases, peak pressure and rate of heat release decrease while peak temperature increases, the tendency to reduce engine power and increase fuel consumption increases. The emissions of CO and soot are reduced, while NOx is increased.","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78681544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-15DOI: 10.51316/jst.159.etsd.2022.32.3.8
C. Nguyen, Quoc-Dung Ngo, A. Bui
Laboratory-scale experiments were carried out to improve the strength of prestressed steel by combination of the Cr-Ti alloying and heat treatment. A predetermined amount of the scrap and some ferrous alloys (such as FeMn, FeSi, FeCr and FeTi) was melted in the induction furnace to obtain the aimed compositions of the steel ASTM A633 grade C and the modified steel with Cr-Ti alloying. The molten steel was cast into the 45 mm ingot which was then hot forged into the 25 mm, subsequently prepared the tensile specimens that were heat-treated by quenching and tempering. After that, the hot forged and heat-treated specimens were subjected to the composition analysis, the tensile test and microstructural observation by optical and scanning electron microscopy. It has been concluded that the strengths of the prestressed steel strongly increased when the martensitic microstructure was obtained through the proper heat treatment. All the prepared steel exhibited high strength and adequate elongation, especially the UTS/YS of the Cr-Ti alloyed steel had increased from the value of 961/702 to 1611/1217 MPa and the elongation decreased from 15 to 10% corresponding to the deformed and heat-treated sample. These increasing strengths were attributed to the hardenability of the Cr element as well as the formation of the TiN precipitates which hindered the movement of the dislocation. The results suggested that further research must be conducted for the practical production of prestressed steel that is used in construction applications.
{"title":"Improving the Strength of Prestressed Steel ASTM A633 Grade C by Combination of the Cr-Ti Alloying and Heat Treatment","authors":"C. Nguyen, Quoc-Dung Ngo, A. Bui","doi":"10.51316/jst.159.etsd.2022.32.3.8","DOIUrl":"https://doi.org/10.51316/jst.159.etsd.2022.32.3.8","url":null,"abstract":"Laboratory-scale experiments were carried out to improve the strength of prestressed steel by combination of the Cr-Ti alloying and heat treatment. A predetermined amount of the scrap and some ferrous alloys (such as FeMn, FeSi, FeCr and FeTi) was melted in the induction furnace to obtain the aimed compositions of the steel ASTM A633 grade C and the modified steel with Cr-Ti alloying. The molten steel was cast into the 45 mm ingot which was then hot forged into the 25 mm, subsequently prepared the tensile specimens that were heat-treated by quenching and tempering. After that, the hot forged and heat-treated specimens were subjected to the composition analysis, the tensile test and microstructural observation by optical and scanning electron microscopy. It has been concluded that the strengths of the prestressed steel strongly increased when the martensitic microstructure was obtained through the proper heat treatment. All the prepared steel exhibited high strength and adequate elongation, especially the UTS/YS of the Cr-Ti alloyed steel had increased from the value of 961/702 to 1611/1217 MPa and the elongation decreased from 15 to 10% corresponding to the deformed and heat-treated sample. These increasing strengths were attributed to the hardenability of the Cr element as well as the formation of the TiN precipitates which hindered the movement of the dislocation. The results suggested that further research must be conducted for the practical production of prestressed steel that is used in construction applications.","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86349007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-15DOI: 10.51316/jst.159.etsd.2022.32.3.10
Ngo Van Thai, B. Q. Khanh
The non-linearity of the conductance of the electric arc furnace causes voltage flicker and harmonics in power systems. Nowadays, the application of electric arc furnaces in the steel production industry in Vietnam also results in the aforementioned power quality issues and it has been critical to find appropriate solutions for mitigation of those issues recently. This paper develops a time-domain simulation of electric arc furnace that can show power quality issues such as voltage flicker and harmonics in the distribution system and the solution using an active filter for power quality improvement in MATLAB/SIMULINK and thus, it is possible to assess the influences of different parameters of electric arc furnace on the design of active filter. The comparison of simulation results and experimental results obtained from the distribution system of the factory of Thien Phat Company has been conducted.
{"title":"On a Matlab/Simulink of Power Quality Issues in Distribution System with the Presence of Electric Arc Furnaces and Mitigation Solution Using Active Filter","authors":"Ngo Van Thai, B. Q. Khanh","doi":"10.51316/jst.159.etsd.2022.32.3.10","DOIUrl":"https://doi.org/10.51316/jst.159.etsd.2022.32.3.10","url":null,"abstract":"The non-linearity of the conductance of the electric arc furnace causes voltage flicker and harmonics in power systems. Nowadays, the application of electric arc furnaces in the steel production industry in Vietnam also results in the aforementioned power quality issues and it has been critical to find appropriate solutions for mitigation of those issues recently. This paper develops a time-domain simulation of electric arc furnace that can show power quality issues such as voltage flicker and harmonics in the distribution system and the solution using an active filter for power quality improvement in MATLAB/SIMULINK and thus, it is possible to assess the influences of different parameters of electric arc furnace on the design of active filter. The comparison of simulation results and experimental results obtained from the distribution system of the factory of Thien Phat Company has been conducted.","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88942116","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-15DOI: 10.51316/jst.159.etsd.2022.32.3.9
N. Thanh, Nguyen Trung Dung, Ta Hong Duc
The paper establishes a simple and practical model for a water-wall system comprising supercritical once-through boilers. The mathematical model of the system is developed and built based on mass, energy and momentum balance equations. The system of equations gives the linear and differential algebraic equations expressed by pressure and temperature. The model is solved by a program written in the MATLAB application. The data in the literature are also provided for comparison, and good agreement with the model results. The MATLAB program could be applied for basic design of process in the supercritical once though boiler in the thermal power plants in Vietnam.
{"title":"Modeling of Steam Generation Process in the Supercritical Once-Though Boiler in the Thermal Power Plant with MATLAB Application","authors":"N. Thanh, Nguyen Trung Dung, Ta Hong Duc","doi":"10.51316/jst.159.etsd.2022.32.3.9","DOIUrl":"https://doi.org/10.51316/jst.159.etsd.2022.32.3.9","url":null,"abstract":"The paper establishes a simple and practical model for a water-wall system comprising supercritical once-through boilers. The mathematical model of the system is developed and built based on mass, energy and momentum balance equations. The system of equations gives the linear and differential algebraic equations expressed by pressure and temperature. The model is solved by a program written in the MATLAB application. The data in the literature are also provided for comparison, and good agreement with the model results. The MATLAB program could be applied for basic design of process in the supercritical once though boiler in the thermal power plants in Vietnam.","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75854461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-15DOI: 10.51316/jst.159.etsd.2022.32.3.5
N. Thanh, P. Yen
Dendrobium nobile Lindl.(Orchidaceae), Vietnamese name as Hoang thao dui ga is an epiphytic plant on high tree branches. It grows widely in humid mountainous areas in Vietnam. The plant is used to treat fever, dry mouth, dry throat, increase vitality in traditional medicine. In the course of study on chemical composition of Dendrobium nobile Lindl. in Vietnam, this paper describes the extraction and structure evaluation of five known compounds, including E-1,5-bis(4-hydroxyphenyl)-pent-1-en-3-one (1) together with ferulic acid (2), 4-hydroxy cinnamic acid (3) umbellic acid (4) and 3-(4-hydroxyphenyl) propionic acid (5). The stems of this plant were collected, identified, dried and extracted in different polarity solvents. These substances were isolated from the ethyl acetate and water fractions of methanol extract on the basis of column chromatography. Their structures were identified based on spectroscopic evaluation and comparison of corresponding authentic compounds. This is the first report of compound 1 from the Dendrobium genus.
石斛(Dendrobium nobile Lindl.)(兰科)，越南名Hoang thao dui ga，是一种高枝附生植物。它广泛生长在越南潮湿的山区。该植物在传统医学中用于治疗发烧，口干，喉咙干，增加活力。在对石斛化学成分进行研究的过程中。在越南，本文报道了e -1,5-双(4-羟基苯基)-戊-1-烯-3-酮(1)、阿魏酸(2)、4-羟基肉桂酸(3)、伞酸(4)和3-(4-羟基苯基)丙酸(5)等5种已知化合物的提取和结构评价。对该植物的茎进行了收集、鉴定、干燥和不同极性溶剂的提取。采用柱层析法从甲醇提取物的乙酸乙酯和水馏分中分离出这些物质。通过光谱分析和比较，鉴定了它们的结构。这是石斛属植物中首次报道的化合物1。
{"title":"Phenolic Compounds from Dendrobium Nobile Lindl.","authors":"N. Thanh, P. Yen","doi":"10.51316/jst.159.etsd.2022.32.3.5","DOIUrl":"https://doi.org/10.51316/jst.159.etsd.2022.32.3.5","url":null,"abstract":"Dendrobium nobile Lindl.(Orchidaceae), Vietnamese name as Hoang thao dui ga is an epiphytic plant on high tree branches. It grows widely in humid mountainous areas in Vietnam. The plant is used to treat fever, dry mouth, dry throat, increase vitality in traditional medicine. In the course of study on chemical composition of Dendrobium nobile Lindl. in Vietnam, this paper describes the extraction and structure evaluation of five known compounds, including E-1,5-bis(4-hydroxyphenyl)-pent-1-en-3-one (1) together with ferulic acid (2), 4-hydroxy cinnamic acid (3) umbellic acid (4) and 3-(4-hydroxyphenyl) propionic acid (5). The stems of this plant were collected, identified, dried and extracted in different polarity solvents. These substances were isolated from the ethyl acetate and water fractions of methanol extract on the basis of column chromatography. Their structures were identified based on spectroscopic evaluation and comparison of corresponding authentic compounds. This is the first report of compound 1 from the Dendrobium genus.","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72820973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-15DOI: 10.51316/jst.159.etsd.2022.32.3.1
Trương Thuc Bao Nguyen, Ta Hong Duc, T. Vu
Chalcones are a class of compounds with a wide range of biological activities. In addition, derivatives based on the quinazolinone skeleton are currently of interest to research in the screening of compounds with cytotoxic effects. Compounds containing chalcone structures on the basis of quinazolinone can yield new structures with cytotoxic effects. This article presents the synthesis of new quinazolinone-based chalcones 8a-j via a three step-procedure. The first step is the condensation of 5-hydroxyanthranilic acid (5) with acetic anhydride at reflux for 2 h to afford intermediate 6 in 87%. This intermediate was then reacted with 4-aminoacetophenone in acetic acid at reflux for 14 h to give 7 in 77 %. Finally, the reaction of 7 with different aldehydes in ethanol in the presence of NaOH at room temperature for 14 h furnished target compounds 8a-j in 57 - 75%. The structure of synthesized compounds was confirmed using 1H, 13C NMR and MS spectra. The bioassay results showed that several compounds displayed cytotoxic activity against two cell lines including HepG-2 and SKLu-1. Among synthesized compounds, 8c exhibited the strongest cytotoxic activity against SKLu-1 with IC50 value of 20.10 µM.
{"title":"Synthesis and In vitro Cytotoxic Evaluation of New Quinazolinone-Based Chalcones","authors":"Trương Thuc Bao Nguyen, Ta Hong Duc, T. Vu","doi":"10.51316/jst.159.etsd.2022.32.3.1","DOIUrl":"https://doi.org/10.51316/jst.159.etsd.2022.32.3.1","url":null,"abstract":"Chalcones are a class of compounds with a wide range of biological activities. In addition, derivatives based on the quinazolinone skeleton are currently of interest to research in the screening of compounds with cytotoxic effects. Compounds containing chalcone structures on the basis of quinazolinone can yield new structures with cytotoxic effects. This article presents the synthesis of new quinazolinone-based chalcones 8a-j via a three step-procedure. The first step is the condensation of 5-hydroxyanthranilic acid (5) with acetic anhydride at reflux for 2 h to afford intermediate 6 in 87%. This intermediate was then reacted with 4-aminoacetophenone in acetic acid at reflux for 14 h to give 7 in 77 %. Finally, the reaction of 7 with different aldehydes in ethanol in the presence of NaOH at room temperature for 14 h furnished target compounds 8a-j in 57 - 75%. The structure of synthesized compounds was confirmed using 1H, 13C NMR and MS spectra. The bioassay results showed that several compounds displayed cytotoxic activity against two cell lines including HepG-2 and SKLu-1. Among synthesized compounds, 8c exhibited the strongest cytotoxic activity against SKLu-1 with IC50 value of 20.10 µM.","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86059114","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-15DOI: 10.51316/jst.159.etsd.2022.32.3.3
Xuan-Vien Nguyen, AnQuoc Hoang, Hong Son Nguyen Le
In this study, a three−dimensional numerical simulation on electrodes in solid oxide fuel cells (SOFCs) is investigated in both regular cell and button cell configurations. The cell unit models with a regular cell with an active area of 5cm × 5cm and with a button cell with an active area of 2.54 cm2 were conducted to investigate the voltage distribution on cell electrodes in the solid oxide fuel cells (SOFCs). The performance characteristics in SOFC cell unit are determined through a numerical simulation method by using a computational fluid dynamic (CFD). The COMSOL Multiphysics software is used to investigate the model. The results show that the cell voltage in both regular cell and button cell with operating temperatures of 650 and 700 °C were lower than those at 750 °C. This means that when the operating temperature increases, the voltage and current density on the solid oxide fuel cell electrodes increases, and the performance of the cell is also improved.
{"title":"Simulation Study on the Effects of Operating Temperature on Cell Electrodes in Solid Oxide Fuel Cells","authors":"Xuan-Vien Nguyen, AnQuoc Hoang, Hong Son Nguyen Le","doi":"10.51316/jst.159.etsd.2022.32.3.3","DOIUrl":"https://doi.org/10.51316/jst.159.etsd.2022.32.3.3","url":null,"abstract":"In this study, a three−dimensional numerical simulation on electrodes in solid oxide fuel cells (SOFCs) is investigated in both regular cell and button cell configurations. The cell unit models with a regular cell with an active area of 5cm × 5cm and with a button cell with an active area of 2.54 cm2 were conducted to investigate the voltage distribution on cell electrodes in the solid oxide fuel cells (SOFCs). The performance characteristics in SOFC cell unit are determined through a numerical simulation method by using a computational fluid dynamic (CFD). The COMSOL Multiphysics software is used to investigate the model. The results show that the cell voltage in both regular cell and button cell with operating temperatures of 650 and 700 °C were lower than those at 750 °C. This means that when the operating temperature increases, the voltage and current density on the solid oxide fuel cell electrodes increases, and the performance of the cell is also improved.","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85929773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-15DOI: 10.51316/jst.159.etsd.2022.32.3.2
Trung Thanh Nguyen, Ngoc Hanh Nguyen, T. N. Thi, Tri Thich Le, Phuoc Toan Phan, N. Nguyen
In this study, the complete oxidation of an aromatic hydrocarbon compound such as toluene into carbon dioxide and water was carried out in a continuous fixed bed reactor. OMS-2 material synthesized by the refluxing method was used as the catalyst. To reduce the cost of the catalyst, various support materials were employed for supporting the OMS-2 catalyst. The effects of supports (i.e., bentonite, kaolinite, and alumina) and their contents on the catalytic activity of OMS-2 for the oxidation of toluene were investigated. Among the supports, bentonite with Al:Si ratio of 1:2 was the best material with the lowest temperature that reached 100% of toluene conversion at 260 oC. Therefore, 20%OMS-2/bentonite could be a suitable catalyst with high efficiency but low cost for catalytic oxidation of toluene and other organic compounds in the gas phase.
{"title":"A Study on the Effect of Support on the Catalytic Activity of OMS-2 for Oxidation of Toluene in Gas Phase","authors":"Trung Thanh Nguyen, Ngoc Hanh Nguyen, T. N. Thi, Tri Thich Le, Phuoc Toan Phan, N. Nguyen","doi":"10.51316/jst.159.etsd.2022.32.3.2","DOIUrl":"https://doi.org/10.51316/jst.159.etsd.2022.32.3.2","url":null,"abstract":"In this study, the complete oxidation of an aromatic hydrocarbon compound such as toluene into carbon dioxide and water was carried out in a continuous fixed bed reactor. OMS-2 material synthesized by the refluxing method was used as the catalyst. To reduce the cost of the catalyst, various support materials were employed for supporting the OMS-2 catalyst. The effects of supports (i.e., bentonite, kaolinite, and alumina) and their contents on the catalytic activity of OMS-2 for the oxidation of toluene were investigated. Among the supports, bentonite with Al:Si ratio of 1:2 was the best material with the lowest temperature that reached 100% of toluene conversion at 260 oC. Therefore, 20%OMS-2/bentonite could be a suitable catalyst with high efficiency but low cost for catalytic oxidation of toluene and other organic compounds in the gas phase.","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88029812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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