Modified Indion 225 H Ion-Exchange Resin For Acetylation From Glycerol With Acetic Acid,
2023
Faculty of Engineering
Modified Indion 225 H Ion-Exchange Resin For Acetylation From Glycerol With Acetic Acid, Pakin Sopolapikul
Chulalongkorn University Theses and Dissertations (Chula ETD)
Acetin is a high-value product derived from the esterification of glycerol and acetic acid. The global demand of acetin is increasing as it is a useful chemical for various industries. However, current catalysts are quite expensive and require complicated production steps. Therefore, exploring alternative catalysts for more efficient and cheaper production is essential. One such alternative catalyst is Indion 225 H resin, which is suitable for acetin production. This research studies the efficiency of this catalyst at different temperatures and various catalyst amounts (1-7%) in both a batch system and an azeotropic distillation system to enhance reaction efficiency. Additionally, it …
Effects Of Preparation Method For Titania On Silica Support On Catalyst Stability For Methyl Oleate Epoxidation,
2023
Faculty of Engineering
Effects Of Preparation Method For Titania On Silica Support On Catalyst Stability For Methyl Oleate Epoxidation, Warinya Sukkaew
Chulalongkorn University Theses and Dissertations (Chula ETD)
Biomass is an outstanding raw material instead of fossil fuel because of its renewable and eco-friendly nature. In Southeast Asia in particular, there is an oversupply of palm oil. Converting palm oil into high-value products presents a promising solution. The major composition derived from palm oil is methyl oleate. Methyl oleate can be converted to epoxide product that is used in a broad application in the chemical industry through epoxidation. Ti-based catalyst is a promising candidate catalysts for epoxidation reactions. This work focuses on the epoxidation reaction of methyl oleate with hydrogen peroxide. For Ti-based catalysts, support is essential. The …
The Role Of Pedot-Encapsulated Mno2 For Performance Enhancement Of Zinc-Ion Battery Cathodes,
2023
Faculty of Engineering
The Role Of Pedot-Encapsulated Mno2 For Performance Enhancement Of Zinc-Ion Battery Cathodes, Wichuda Silapasom
Chulalongkorn University Theses and Dissertations (Chula ETD)
Zinc-ion batteries are increasingly recognized as a sustainable and eco-friendly alternative to conventional lithium-ion battery technologies. Among the various cathode materials, manganese dioxide (MnO2), particularly the layered-type δ-MnO2, exhibits significant potential due to its advantageous structure for Zn2+ intercalation. However, the use of aqueous electrolytes in these systems poses challenges, including capacity fading after repeated charge/discharge cycles. Poly(3,4-ethylenedioxythiophene) (PEDOT), an electrically conductive polymer, is known for its properties that enhance Zn2+ ion mobility. In this study, PEDOT-encapsulated δ-MnO2 was synthesized via a hydrothermal method for application as a cathode material in zinc-ion batteries utilizing nonaqueous electrolytes. Advanced characterization techniques, notably …
Effect Of Brønsted And Lewis Acid On Ni-Based Bifunction Catalyst On Hydroprocessing Of Palm Oil To Biojet Fuel,
2023
Faculty of Engineering
Effect Of Brønsted And Lewis Acid On Ni-Based Bifunction Catalyst On Hydroprocessing Of Palm Oil To Biojet Fuel, Settapong Kantangkul
Chulalongkorn University Theses and Dissertations (Chula ETD)
Jet fuels are mainly generated by refining petroleum feedstock, resulting in the emission of greenhouse gases. Therefore, biojet fuel is proposed as an alternative solution for solving this issue. Hydroprocessing of vegetable oils is an efficient pathway for producing biojet fuel. This process includes three reaction which are hydrodeoxygenation, hydrocracking and hydroisomerization over metal-acid catalyst. Biojet fuel series ranging from C8 to C16 must have a freezing point around -47 °C or lower, requiring the use of iso-paraffins which have low freezing points. There are challenges in improving the quantity and quality of biojet fuel production. This study aims to …
Effect Of Ch4 Impurity On Ethanol-Assisted Methanol Synthesis From Co2 And H2 Over Cu/Zn0 Catalyst,
2023
Faculty of Engineering
Effect Of Ch4 Impurity On Ethanol-Assisted Methanol Synthesis From Co2 And H2 Over Cu/Zn0 Catalyst, Banthita Woraphan
Chulalongkorn University Theses and Dissertations (Chula ETD)
The problem of CO2 emissions into the atmosphere is an issue that needs to be addressed worldwide. One of the ways to tackle this problem is to bring back CO2 and reuse it to produce higher-valued products like methanol. Nevertheless, exhausted gases emitted from many industries contain not only CO2 but also various impurities, of which CH4 is a common one. In this work, the simulated flue gas containing CH4 impurity was studied to examine its effect as the feed on the methanol production over Cu/ZnO catalyst, in the presence of ethanol as the catalytic solvent to enhance the conversion …
การจำลองกระบวนการผลิตไฮโดรเจนจากผักตบชวาโดยกระบวนการซูเปอร์คริติคัลวอเตอร์แก๊สซิฟิเคชั่นร่วมกับกระบวนการไตรรีฟอร์มมิ่ง,
2023
คณะวิศวกรรมศาสตร์
การจำลองกระบวนการผลิตไฮโดรเจนจากผักตบชวาโดยกระบวนการซูเปอร์คริติคัลวอเตอร์แก๊สซิฟิเคชั่นร่วมกับกระบวนการไตรรีฟอร์มมิ่ง, สิริกุล บุญเติม
Chulalongkorn University Theses and Dissertations (Chula ETD)
กระบวนการผลิตไฮโดรเจนจากผักตบชวาโดยกระบวนการซูเปอร์คริติคัลวอเตอร์แก๊สซิฟิเคชั่น (SCWG) ร่วมกับไตรรีฟอร์มมิ่ง (TR) ซึ่งประกอบด้วย ปฏิกิริยารีฟอร์มมิ่งด้วยไอน้ำยิ่งยวด (SR) ปฏิกิริยารีฟอร์มมิ่งด้วยก๊าซคาร์บอนไดออกไซด์ (DR) และปฏิกิริยายาออกซิเดชันบางส่วน (PO) ซึ่งเป็นการรวมกันของปฏิกิริยาคายและดูดความร้อน ด้วยตัวกลางอย่างคาร์บอนไดออกไซด์ (CO2), น้ำ (H2O), และออกซิเจน (O2) ถูกนำมาเป็นสารตั้งต้นร่วมกัน และกระบวนการอื่นๆ ผ่านการจำลองการออกแบบกระบวนด้วยแบบจำลองเครื่องปฏิกรณ์เคมีแบบสมดุลด้วยโปรแกรม Aspen plus V.12.1 เพื่อหาแนวทางการออกแบบที่ดีที่สุด โดยเริ่มจากการแตกตัวชีวมวลเพื่อศึกษาหาผลิตภัณฑ์หลักของกระบวนการคือก๊าซสังเคราะห์ อันได้แก่ H2 และ CO แล้วศึกษาหาสภาวะที่เหมาะสมในการผลิตแก๊สไฮโดรเจนผ่านกระบวนไบรีฟอร์มมิ่ง ซึ่งตัวแปรที่ศึกษามุ่งเน้นศึกษา ได้แก่ อุณหภูมิ, ความดัน, และความเข้มข้นของสารตั้งต้นที่ใช้ในกระบวนการผลิตไฮโดรเจน โดยที่สภาวะดำเนินการที่อุณหภูมิ 950 °C และความดัน 1 bar ได้ผลลัพธ์จากการจำลอง โดยมีเศษส่วนโมลของ H2 และ CO เท่ากับ 0.4773 และ 0.5227 ตามลำดับ และพัฒนาการออกแบบกระบวนการซูเปอร์คริติคัลวอเตอร์แก๊สซิฟิเคชั่นร่วมกับไตรรีฟอร์มมิ่งโดยที่สภาวะดำเนินการที่อุณหภูมิ 950 °C และความดัน 200 bar ได้ผลลัพธ์จากการจำลอง โดยมีเศษส่วนโมลของ H2 และ CO เท่ากับ 0.4536 และ 0.5212 ตามลำดับ
Covalent Organic Frameworks Based On Aldehyde And Amine Linkers As Artificial Solid Electrolyte Interphase For Zinc Anode In Aqueous Electrolyte,
2023
Faculty of Engineering
Covalent Organic Frameworks Based On Aldehyde And Amine Linkers As Artificial Solid Electrolyte Interphase For Zinc Anode In Aqueous Electrolyte, Vipada Aupama
Chulalongkorn University Theses and Dissertations (Chula ETD)
Aqueous Zinc-based batteries (AZBBs) are an alternative battery technology being developed for commercial use due to their advantages such as low cost, safety, and eco-friendliness compared to Lithium-based batteries (LBBs). However, despite these benefits, AZBBs face challenges on the zinc anode, including the formation of zinc dendrites and side reactions, which reduce the battery's stability and lifespan. Recently, many strategies have been investigated to address these issues, such as modifying the electrolyte, separator, and anode structure, and specially modifying the zinc surface. One particularly promising strategy involves using an Artificial Solid Electrolyte Interphase (ASEI) developed from a covalent organic framework …
The Effect Of Oxygen Vacancies On The Catalytic Performance For The Ketonization Of Methyl Palmitate Into Palmitone,
2023
Faculty of Engineering
The Effect Of Oxygen Vacancies On The Catalytic Performance For The Ketonization Of Methyl Palmitate Into Palmitone, Mohammad Yazdanpanah
Chulalongkorn University Theses and Dissertations (Chula ETD)
The ketonization of bio-derived fatty acid methyl esters (FAMEs) into added-value products is an increasingly attractive process. However, the role of oxygen vacancies (Ov) in thermal catalytic performance and catalyst lattice oxygen loss has received less attention. This study investigated the relationship between Ov level, acid-base density, and catalytic performance in the ketonization reaction using TiOx catalysts with varying Ov levels prepared by a modified sol-gel method. Density functional theory (DFT) simulations showed that Ov creation increased interatomic distances, leading to the formation of frustrated Lewis pairs (FLPs). The density of acidic and basic sites increased proportionally with Ov concentration. …
การสังเคราะห์ถ่านกัมมันต์จากกากขมิ้นชันโดยใช้ไมโครเวฟ,
2023
คณะวิศวกรรมศาสตร์
การสังเคราะห์ถ่านกัมมันต์จากกากขมิ้นชันโดยใช้ไมโครเวฟ, ศิราภรณ์ ซำศิริ
Chulalongkorn University Theses and Dissertations (Chula ETD)
ในงานวิจัยนี้ศึกษาเกี่ยวกับการนำความร้อนจากไมโครเวฟมาใช้สำหรับการสังเคราะห์ถ่านกัมมันต์จากกากขมิ้นชันโดยกระตุ้นด้วยสารละลายโพแทสเซียมคาร์บอเนต(K2CO3) และสารละลายกรดฟอสฟอริก(H3PO4) เพื่อกำจัดสีย้อมรีแอคทีฟ แบล็ค5 (RB5) โดยจะศึกษาผลของปัจจัยต่างๆ ได้แก่ กำลังของไมโครเวฟและเวลาในการให้ความร้อนต่อการสังเคราะห์ถ่านกัมมันต์ ถ่านกัมมันต์ที่สังเคราะห์ได้จะถูกทดสอบคุณลักษณะด้วยวิธีต่างๆ ได้แก่ การดูดซับและการคายซับไนโตรเจน กล้องจุลทรรศน์อิเล็กตรอนแบบส่องกราด ฟลูเรียร์ทรานส์ฟอร์ม อินฟราเรดสเปคโทรไมโครสโคป และ เอกซ์เรย์ดิฟแฟรกชัน ถ่านกัมมันต์ที่ถูกกระตุ้นด้วยH3PO4ที่กำลังไมโครเวฟ 800 W และใช้เวลาให้ความร้อน 30 min หรือ ถ่านกัมมันต์ H80030 จะมีการพัฒนาของโครงสร้างรูพรุนที่ดีกว่าถ่านกัมมันต์ตัวอื่นๆ โดยจะมีพื้นที่ผิวจำเพาะ, ปริมาตรรูพรุนขนาดเล็กและปริมาตรรูพรุนขนาดกลางที่มีค่าสูงที่สุดเท่ากับ 1339.083 m2/g, 0.725 cm3/g และ 0.524 cm3/g ตามลำดับ ส่งผลให้มีประสิทธิภาพในการดูดซับสูงสุดเท่ากับ 9.830 mg/g และมีร้อยละในการกำจัดมากกว่า90% ในช่วงความเข้มข้นของสารละลายรีแอคทีฟ แบล็ค5 เท่ากับ 10-40 ppm ที่ปริมาณคาร์บอน 100 mg เมื่อทำการศึกษาสมดุลของการดูดซับพบว่าถ่านกัมมันต์ H80030 สอดคล้องกับแบบจำลองไอโซเทอมของ Freundlich และแบบจำลองทางจลน์ศาสตร์แบบ Pseudo-second order (PSO) นอกจากนี้การศึกษาทางเทอร์โมไดนามิกส์ของการดูดซับพบว่าเป็นกระบวนการคายความร้อนและมีกลไกการดูดซับแบบกายภาพ
Development Of Ni/Cao-Al2o3 Pellet Catalyst For Hydrogen Production From Treated Biogas Via Sorption-Enhanced Steam Reforming Reaction,
2023
Faculty of Engineering
Development Of Ni/Cao-Al2o3 Pellet Catalyst For Hydrogen Production From Treated Biogas Via Sorption-Enhanced Steam Reforming Reaction, Paveenuch Nantapong
Chulalongkorn University Theses and Dissertations (Chula ETD)
In this research, multifunctional Ni/CaO-Al2O3-based catalyst was developed for hydrogen production via sorption-enhanced steam reforming (SE-SR) of treated biogas. Parametric effects including reforming temperature (400-900oC), CO2 concentration in the treated biogas (0% - 80% v/v), steam to carbon molar ratio (S/C = 1-4), and type of promoter (Ce and Mg) were studied. The influence of parametric effects was firstly determined using Aspen plus V11 software to find suitable operating condition for experiments. The results showed that at atmospheric pressure, reforming temperature of 650 °C, steam to carbon ratio 3-4, is optimum for the production of H2 via the SE-SR from …
Structural Evolution Of The Phu Kradung Formation By Calcite Veins Characterization, South Of Lam Sonthi District, Lopburi Province.,
2023
Faculty of Science
Structural Evolution Of The Phu Kradung Formation By Calcite Veins Characterization, South Of Lam Sonthi District, Lopburi Province., Ausa Nonthason
Chulalongkorn University Theses and Dissertations (Chula ETD)
Calcite veins in Mesozoic sedimentary rock localities are found in the southern part of Lam Sonthi district, Lopburi province, in central Thailand, near the Loei-Petchabun fold belt regions. The vein’s host rocks are siliciclastic rocks, primarily mudstone and sandstone. The main aim of this study is to learn more about calcite vein geometry and development, as well as the structural evolution of calcite veins in the Phu Kradung formation in the Lam Sonthi area of Lopburi province. A petrographic and structural analysis of the veins was performed to examine the kinematics and geological structures of the calcite vein in the …
Geophysical Characteristics Of Kuan Kreng Peat Swamp Forest At Thale Noi Area,
2023
Faculty of Science
Geophysical Characteristics Of Kuan Kreng Peat Swamp Forest At Thale Noi Area, Theethach Phiranram
Chulalongkorn University Theses and Dissertations (Chula ETD)
Peatlands, as an important carbon sink, store a large amount of atmospheric carbon. However, peatlands are vulnerable to environmental alteration due to anthropogenic and natural processes. While peatlands are degraded, carbon dioxide emissions arise. The Kuan Kreng peat swamp forest is the second largest peatland in Thailand and is in coastal wetland serving for carbon stock in the subsurface. To assess carbon stock in peatland, the thickness and distribution of the peat layer are necessary. This study determines physical and chemical characteristics of the peatlands in the coastal wetland, southern Thailand by conventional core study and geophysical surveys, including ground …
Microencapsulation Of Holy Basil Oil Using Modified Starch By Spray Drying Method,
2023
Faculty of Engineering
Microencapsulation Of Holy Basil Oil Using Modified Starch By Spray Drying Method, Artima Lairattanakul
Chulalongkorn University Theses and Dissertations (Chula ETD)
Holy basil is a local herb that can planted all over Thailand. It is the significant ingredient in Thai famous dish named “Pad ga prao” because of its unique scent which is released when cooked. Apart from the cuisine, its essential oil has been used in various industries including cosmetics, perfumery, and pharmaceuticals. However, their degradation under light, moisture, and high temperature during storage is the main problem of their utility. In this research, the encapsulation process is selected to prevent the problem. The modified starch was used as wall materials. Holy basil oil (HBO) has three main components: Eugenol, …
Effect Of Rice Straw Loading On Morphological, Thermal, Gas Barrier, And Mechanical Properties Of Poly(Lactic Acid)/Poly(3-Hydroxybutyrate-Co-4-Hydroxybutyrate) Blend Films,
2023
Faculty of Engineering
Effect Of Rice Straw Loading On Morphological, Thermal, Gas Barrier, And Mechanical Properties Of Poly(Lactic Acid)/Poly(3-Hydroxybutyrate-Co-4-Hydroxybutyrate) Blend Films, Danaipat Tuangwattanasin
Chulalongkorn University Theses and Dissertations (Chula ETD)
This research focuses on enhancing the properties of polylactic acid (PLA), a biodegradable polymer known for its potential in mitigating waste accumulation issues. The inherent brittleness of PLA poses a significant challenge. To overcome this limitation, the study explores the incorporation of the biodegradable polymer poly(3-hydroxybutyrate-co-4-hydroxybutyrate) (P3HB4HB) into PLA. The PLA/P3HB4HB blend films were prepared by varying compositions from 100/0 to 60/40 wt/wt and using compression molding. The investigations indicated that the PLA/P3HB4HB 90/10 blend film exhibits superior properties, such as synergistic toughness and increased %strain. Rice straw (RS) fiber is introduced as a reinforcing fiber in the blends, expanding …
Tarnish Resistance Of Silver Reinforced With Carbon Material To Artificial Sweat And Hydrogen Sulfide,
2023
Faculty of Engineering
Tarnish Resistance Of Silver Reinforced With Carbon Material To Artificial Sweat And Hydrogen Sulfide, Kunthida Chanthaban
Chulalongkorn University Theses and Dissertations (Chula ETD)
Due to its immense popularity, silver jewelry has undergone continual development, it an intriguing product. The most significant issue with silver jewelry is the tarnish of the silver metal's surface. Therefore, using a coin making technique, the study team evaluated the properties of silver metal reinforced by carbon materials. To evaluate the silver's to sweat and hydrogen sulfide tarnishing. Effects of adding carbon to samples after performing an artificial sweat test. It was discovered that the use of highly scattered carbon improved the ability to remove tarnish from fake sweat because it reduced the surface area of the silver (Ag) …
Effect Of Dispersion Of Carbon Nanotubes On Electrical Conductivity And Compressive Strength Of Cnt/Cement Composite,
2023
Faculty of Engineering
Effect Of Dispersion Of Carbon Nanotubes On Electrical Conductivity And Compressive Strength Of Cnt/Cement Composite, Rittikiat Wandaw
Chulalongkorn University Theses and Dissertations (Chula ETD)
Carbon nanotubes (CNTs) are promising nanomaterials due to their exceptional properties, including high electrical, mechanical, and stability characteristics. These advantageous features position CNTs as suitable candidates for diverse applications, particularly in additive formulations designed to enhance overall performance. One notable application is their use in cement composites to improve mechanical and electrical properties. However, the hydrophobic property of CNTs presents challenges for dispersion within the hydrophilic cement matrix. Consequently, methods have been developed to aid CNT dispersion in both water and cement matrices. In this thesis, Triton X-100 employed as a surfactant, was used to disperse CNTs in water using …
Activity And Stability Of Tio2-Encapsulated Cspbbr3/Cs4pbbr6 For Photocatalytic Degradation Of Rhodamine B,
2023
Faculty of Engineering
Activity And Stability Of Tio2-Encapsulated Cspbbr3/Cs4pbbr6 For Photocatalytic Degradation Of Rhodamine B, Nutzeya Plainoen
Chulalongkorn University Theses and Dissertations (Chula ETD)
Due to the excellent optoelectronic performance of cesium lead bromide(CsPbBr3), it has shown promising potential as a photocatalyst for the degradation of organic compounds under sunlight. During the synthesis of CsPbBr3, Cs4PbBr6, another formation of CsPbBr3, is also produced, which exhibits desirable properties such as strong and narrow photoluminescence (PL) and enhanced thermal stability. In this study, we successfully synthesized a mixture of CsPbBr3/Cs4PbBr6 nanoparticles using a simple precipitation method. However, the stability of CsPbBr3/Cs4PbBr6 was found to be sensitive to high temperatures, moisture, and oxygen, which could affect its photocatalytic degradation performance. To enhance both stability and activity, we …
Effect Of Type And Concentration Of Acid On Characteristics Of Functionalized Biochar And Its Performance In Converting Fructose To 5-Hmf,
2023
Faculty of Engineering
Effect Of Type And Concentration Of Acid On Characteristics Of Functionalized Biochar And Its Performance In Converting Fructose To 5-Hmf, Pimlapas Bunwichian
Chulalongkorn University Theses and Dissertations (Chula ETD)
Biomass, with its high cellulosic content, represented renewable source capable of being converted into essential platform chemicals like 5-hydroxymethylfurfural, levulinic acid, formic acid, and furfural. Currently, conversion of fructose to 5-HMF was achievable through various acid homogeneous catalysts. Although these catalysts yield higher outputs, they might pose challenges in recycling and corrosion issues. This thesis's novel approach involved preparing heterogeneous catalysts through pyrolysis and hydrothermal treatment of watermelon rind to create watermelon rind biochar (WB). Subsequently, WB underwent functionalization using HCl, H2SO4, and H3PO4 at concentrations of 1.6, 3.2, and 4.8N, respectively, at temperatures of 150 °C. These treated WB …
A Comparative Study Of Sustainable Aviation Fuel Production From Hydroprocessing Process Between Hydrogen Recovery Unit From Steam Reforming And Hydrogen Generation Unit From Biomass Gasification,
2023
Faculty of Engineering
A Comparative Study Of Sustainable Aviation Fuel Production From Hydroprocessing Process Between Hydrogen Recovery Unit From Steam Reforming And Hydrogen Generation Unit From Biomass Gasification, Praeva Pongsripipat
Chulalongkorn University Theses and Dissertations (Chula ETD)
Sustainable aviation fuel (SAF) can be generated using various processes. Among the well-established approaches, one that stands out is the hydrotreating of esters and fatty acids (HEFA). However, the HEFA process requires a source of hydrogen for the hydroprocessing reactions. Hydrogen is often considered as an expensive component, and its cost can have a significant impact on the overall economic viability of renewable aviation fuel production. In this work, the SAF process is developed using Aspen Plus simulation. There are 2 scenarios to be considered. Scenario 1 involves a plant in which the hydrotreating of palm oil is performed to …
Carboxymethyl Cellulose As Artificial Solid/Electrolyte Interphases And Separator For Zn-Based Battery,
2023
Faculty of Engineering
Carboxymethyl Cellulose As Artificial Solid/Electrolyte Interphases And Separator For Zn-Based Battery, Phonnapha Tangthuam
Chulalongkorn University Theses and Dissertations (Chula ETD)
As the quest for robust large-scale energy storage systems (EESs) intensifies, aqueous rechargeable zinc-based batteries are gaining traction for grid-scale applications due to their high theoretical capacity and safety. Despite this, their practical application is compromised by several zinc anode issues, including hydrogen evolution, corrosion, dendritic growth, and passivation. An artificial solid electrolyte interphase (ASEI) using polyelectrolytes, such as carboxymethyl cellulose (CMC), is emerging as a solution, offering economic and environmental advantages. CMC's structure, enriched with carboxyl groups, allows for the refined management of zinc ion distribution at the electrode surface, promising enhanced surface stability. This study delves into CMC's …
