Nanocomposite Membranes Incorporated With Graphene Oxide For Co2/Ch4 Separation,
2017
Faculty of Engineering
Nanocomposite Membranes Incorporated With Graphene Oxide For Co2/Ch4 Separation, Nadia Norahim
Chulalongkorn University Theses and Dissertations (Chula ETD)
Biogas is an alternative energy produced by anaerobic digestion of organic matter. Generally, raw biogas consists of methane (CH4), carbon dioxide (CO2), few amount of hydrogen sulfide (H2S) and traces of water vapor. Nowadays, upgrading raw biogas is required in order to achieve higher calorific value and meet fuel standard by removal of CO2. In this study, composite membranes of PEG 400/Pebax 1657 blended polymer with graphene oxide (GO) and amine functionalized graphene oxide (Fn-GO) were successfully developed for CO2/CH4 gas separation. The effects of graphene oxide, amine functionalized graphene oxide and PEG 400 additions on CO2/CH4 separation performance were …
Synthesis Of Cu2znsns4 For Thin Film Solar Cells Prepared By Solution-Based Processes,
2017
Faculty of Engineering
Synthesis Of Cu2znsns4 For Thin Film Solar Cells Prepared By Solution-Based Processes, Napaporn Khothong
Chulalongkorn University Theses and Dissertations (Chula ETD)
Copper zinc thin sulphide (Cu2ZnSnS4: CZTS) thin films were synthesized via convective deposition method at various deposit speeds based on sol-gel precursor of 2-methoxyethanol solution with metal chlorides and thiourea. The deposited films were annealed at 340 to 550ºC under N2 atmosphere to yield high quality CZTS films. The compositions, morphology, phase, and optical properties of the CZTS films were characterized by Energy dispersive X-ray analysis (EDX), Scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy, and UV-Vis spectrophotometer, respectively. The formation films exhibited in kesterite structure and the band gap was about 1.4-1.5 eV. The CZTS films also applied …
Characteristics And Catalytic Properties Of Agli/Sio2 Catalysts On Different Silica Supports For Oxidative Dehydrogenation Of Ethanol To Acetaldehyde,
2017
Faculty of Engineering
Characteristics And Catalytic Properties Of Agli/Sio2 Catalysts On Different Silica Supports For Oxidative Dehydrogenation Of Ethanol To Acetaldehyde, Narawich Mukda
Chulalongkorn University Theses and Dissertations (Chula ETD)
This work focuses on investigation of the oxidative dehydrogenation and non-oxidative dehydrogenation of ethanol over AgLi/SiO2 catalysts to produce acetaldehyde by having three different types of silica support, spherical silica particle (small particle size; SPS), medium silica particle size (MPS), and large silica particle size (LPS). The spherical silica particle (SSP) was synthesized using the sol-gel method, whereas SiO2 (MPS) and SiO2 (LPS) were obtained from commercial suppliers. AgLi/SiO2 catalysts were prepared by incipient wetness co-impregnation method. The physicochemical properties of catalysts were analyzed by using several technique such as X-ray diffraction (XRD), N2-physisorption, SEM-EDX, UV-visible spectroscopy, H2-TPR. Moreover, the …
Effects Of Titanium Dioxide Structure And Cobalt Addition On The Catalytic Properties Of Ru/Tio2 In The Selective Hydrogenation Of Furfural To Furfuryl Alcohol,
2017
Faculty of Engineering
Effects Of Titanium Dioxide Structure And Cobalt Addition On The Catalytic Properties Of Ru/Tio2 In The Selective Hydrogenation Of Furfural To Furfuryl Alcohol, Natdanai Nanthasanti
Chulalongkorn University Theses and Dissertations (Chula ETD)
Furfuryl alcohol, an important intermediate for the production of many fine chemicals, is typically produced by the selective hydrogenation of lignocellulosic biomass-derived furfural using supported metal catalysts. In this research, 1.5%wt Ru catalysts supported on nanocrystalline TiO2 were prepared by incipient wetness impregnation method. The effects of crystallographic of TiO2 and Co addition in the range of 0.2-0.8 wt% on the catalytic properties of Ru/TiO2 were investigated in the selective hydrogenation of furfural to furfural alcohol at 50°C, 20 bar of H2, and 2 h reaction time. It was found that Ru supported on anatase phase TiO2 exhibited the highest …
Dehydration Of Ethanol Over Zsm-5 Catalysts Having Different Si/Al Molar Ratios With H3po4 And Pd Modification,
2017
Faculty of Engineering
Dehydration Of Ethanol Over Zsm-5 Catalysts Having Different Si/Al Molar Ratios With H3po4 And Pd Modification, Nattawat Nampipat
Chulalongkorn University Theses and Dissertations (Chula ETD)
Dehydration of ethanol was studied over ZSM-5, HZSM-5 and modified HZSM-5 catalysts under atmospheric pressure and temperature range of 200 °C to 400 °C. ZSM-5 catalysts were prepared by hydrothermal method using tetraphopylammonium bromide, sodium silicate solution and aluminium nitrate nonahydrate. The results showed that the various Si/Al molar ratios led to affect the amount of acidity on the surface of catalysts. The ZSM-5(20) catalyst exhibited the highest ethanol conversion at 400 °C about 70.3 % due to its high acid sites and large surface area. The commercial HZSM-5 catalysts, which had molar ratio similar to ZSM-5 Si/Al 20 catalysts, …
Ethylene Polymerization Over Cellulose-Supported Modified Methylaluminoxane/Zirconocene Catalyst,
2017
Faculty of Engineering
Ethylene Polymerization Over Cellulose-Supported Modified Methylaluminoxane/Zirconocene Catalyst, Natthadabhorn Thanarattanasap
Chulalongkorn University Theses and Dissertations (Chula ETD)
Presently, the polyethylene has been profusely applied in the several industries, for instance manufacturing of pipe, film and plastic bags. In polyethylene production, there are two catalysts which are used in production, including Ziegler-Natta catalyst and metallocene catalyst. The metallocene catalyst is immobilized by support and activated by cocatalyst. For the support of metallocene catalysts, both of inorganic and organic supports are applied and in this research study, cellulose which is organic support for metallocene catalyst, was used. Since, cellulose is extensively used biopolymer representing a great deal of total annual biomass production. Due to environmental issues, natural materials have …
Effects Of Pbs Quantum Dot Doped Tio2 Nanotubes As Electron Transporting Layer On The Efficiency Of Perovskite Solar Cells,
2017
Faculty of Engineering
Effects Of Pbs Quantum Dot Doped Tio2 Nanotubes As Electron Transporting Layer On The Efficiency Of Perovskite Solar Cells, Natthapat Rattanawichai
Chulalongkorn University Theses and Dissertations (Chula ETD)
TiO2 nanotubes (TNTs) are used as an excellent electron transporting layer for high efficiency perovskite solar cells. In this work, TNTs were synthesized via hydrothermal process from different particle sizes of TiO2 nanoparticle precursors as follows: 5 nm, 25 nm, and 50 nm. The highest surface area of 312.39 m2/g of TNTs was obtained from TiO2 precursor with particle size of 25 nm and was used to dope with lead sulfide quantum dots (PbS QDs). Due to a large band gap and poor conductivity of TNTs which limits the efficiency to transport electrons in the perovskite solar cell, PbS QDs …
Hydrogen Production From Biogas By The Combined Process Of Chemical Looping Water Splitting And Sorption Enhanced Reforming Process: Process Analysis And Design,
2017
Faculty of Engineering
Hydrogen Production From Biogas By The Combined Process Of Chemical Looping Water Splitting And Sorption Enhanced Reforming Process: Process Analysis And Design, Natthaporn Saithong
Chulalongkorn University Theses and Dissertations (Chula ETD)
The integrated sorption-enhanced chemical looping reforming and water splitting (SECLR-WS) process was proposed for hydrogen (H2) production from biogas using iron oxide as the oxygen carrier and calcium oxide (CaO) as a carbon dioxide (CO2) adsorbent. The simulation of the SECLR-WS process was based on a thermodynamic approach and was performed using an Aspen Plus simulator. The sensitivity results showed that the H2 yield (mole of H2/mole of CH4), H2 purity in the fuel reactor (FR), and CH4 conversion could be improved by increasing the steam feed to the FR to CH4 (SFR/CH4) and CaO to CH4 (CaO/CH4) molar ratios. …
Improving Fouling Resistance Of Thin Film Composite Membranes By Addition Of Tio2,
2017
Faculty of Engineering
Improving Fouling Resistance Of Thin Film Composite Membranes By Addition Of Tio2, Palach Kedchaikulrat
Chulalongkorn University Theses and Dissertations (Chula ETD)
Polyamide thin film nanocomposite (TFN) membranes with the addition of titanium dioxide (TiO2) nanoparticles (NPs) were synthesized via an interfacial polymerization (IP) on polyacrylonitrile (PAN) support. Also, the TFC membranes with addition of individual components in the TiO2 colloidal solution, ethanol, TiO2 NPs and nitric acid, were individually studied. The performances of the fabricated membranes were evaluated in terms of NaCl salt rejection, water permeability and anti-fouling capability. Membranes characterizations were conducted to observe various characteristics of membranes such as morphology, surface roughness, surface chemistry and hydrophilicity. The results revealed that the addition of TiO2 colloidal solution in aqueous amine …
Determination Of Mass Transfer Coefficient Of Co2 In Solutions Of Monoethanolamine, 2-(Methylamino)Ethanol And Dimethylaminoethanol In Packed Absorption Column,
2017
Faculty of Engineering
Determination Of Mass Transfer Coefficient Of Co2 In Solutions Of Monoethanolamine, 2-(Methylamino)Ethanol And Dimethylaminoethanol In Packed Absorption Column, Parintorn Vaewhongs
Chulalongkorn University Theses and Dissertations (Chula ETD)
In this study, mass transfer of two new solvents, 2-MAE and DMAE were studied with various factors affecting mass transfer coefficient in comparison with MEA. Effect of solvent types, CO2 inlet loading 0.0, 0.1 and 0.2 mol/mol, solvent concentration 3, 4 and 5 kmol/m3, solvent flow rate 5.3, 10.6 and 15.9 m3/(m2·h) and CO2 content 13-15 v/v% in gas feed were investigated. In all cases, 2-MAE performed highest mass transfer rate among others. The highest mass transfer rate was 1.2656 kmol/(kPa·h·m3) for the case that CO2 inlet loading 0.0 mol/mol, solvent concentration 3 kmol/m3, solvent flow rate 10.6 m3/(m2·h) and …
Development Of Starch-Nanocellulose Composites For Using In Surface Treatment Of Paper,
2017
Faculty of Engineering
Development Of Starch-Nanocellulose Composites For Using In Surface Treatment Of Paper, Phanthakan Ow
Chulalongkorn University Theses and Dissertations (Chula ETD)
The main role of surface sizing is to increase the surface strength of paper. Starch is commonly used as surface sizing agents, but there are still some limitations. In this study, nano-bacterial cellulose (NBC) produced by Acetobacto xylinum was used as a reinforcing material in starch-based composites. The suspensions of NBC starch-based composites were prepared by the additions of 0.10-10.00% w/w NBC into starch solution and were used as surface sizing agents. The structures and properties of NBC starch-based composite films were characterized by FTIR, XRD, and SEM. The mechanical properties and barrier properties of cellulosic paper with surface sizing …
Continuous Hydrotreating Process Of Palm Fatty Acid Distillate (Pfad) Over Bimetallic Nicu/Hzsm-5 Catalyst For Bio Jet Fuel Production,
2017
Faculty of Engineering
Continuous Hydrotreating Process Of Palm Fatty Acid Distillate (Pfad) Over Bimetallic Nicu/Hzsm-5 Catalyst For Bio Jet Fuel Production, Phisit Wirikulcharoen
Chulalongkorn University Theses and Dissertations (Chula ETD)
This research investigated bimetallic NiCu/HZSM-5 catalyst for the production of bio jet fuel via hydrotreating process. The catalysts with different Ni and Cu ratio were characterized by XRD, NH3-TPD, H2-TPR, SEM-EDX and N2-physisorption techniques. Palm fatty acid distillate (PFAD), nonedible by-product from palm oil refining process, was employed as a low-cost feedstock. For catalyst screening, the reaction was performed in an autoclave reactor under batch operation with operating temperature of 375°C, initial H2 pressure of 50 bars and reaction time of 3 h. The results showed that doping Cu could enhance deoxygenation activity while carbon formation was found to be …
Preparation Of Stable Hydrothermal Carbon-Based Catalyst From Defatted Rice Bran And Glucose For Biomass Conversion To 5-Hydroxymethylfurfural,
2017
Faculty of Engineering
Preparation Of Stable Hydrothermal Carbon-Based Catalyst From Defatted Rice Bran And Glucose For Biomass Conversion To 5-Hydroxymethylfurfural, Piyaporn Wataniyakul
Chulalongkorn University Theses and Dissertations (Chula ETD)
This research investigated the preparation of hydrothermal carbon-based catalysts (HTC-SO3H) derived from defatted rice bran (DRB) and glucose for biomass conversion to 5-hydroxymethylfurfural (HMF). Firstly, the effects of hydrothermal carbonization conditions: temperature (180-250 °C) and time (1-8 h) on the yield and the chemical characteristics of the hydrothermal carbons (HTCs) were investigated. The HTCs were then sulfonated with sulfuric acid to obtain HTC-SO3H catalysts. The stability of the catalysts was evaluated based on the amount of biomass conversion products leached into the water at a specified biomass conversion condition. Since no HMF and furfural, and only small amounts of levulinic …
Effects Of Titania Phase And Tungsten Loading Content In W/Tio2 Catalysts On Dehydration Of Ethanol To Diethyl Ether,
2017
Faculty of Engineering
Effects Of Titania Phase And Tungsten Loading Content In W/Tio2 Catalysts On Dehydration Of Ethanol To Diethyl Ether, Pongsatorn Kerdnoi
Chulalongkorn University Theses and Dissertations (Chula ETD)
Nowadays, ethanol which is one of the most used renewable energies can be converted into the more valuable compounds. It was reported that titania-supported tungsten (W/TiO2) catalyst is able to convert ethanol into diethyl ether. However, titania support has different crystalline phases that can result in differences of physicochemical properties for the catalyst. Therefore, the present work reports on the catalytic behaviors of both different phases of titania and tungsten loading contents in catalytic ethanol dehydration to diethyl ether. To prepare the catalysts, the three different phases [anatase (A), rutile (R), and mixed phases (P25)] of titania supports were impregnated …
Modification Of Titanium Dioxide With Nitrogen, Silicon, And Carbon For Visible Light Photocatalysis,
2017
Faculty of Engineering
Modification Of Titanium Dioxide With Nitrogen, Silicon, And Carbon For Visible Light Photocatalysis, Rachan Klaysri
Chulalongkorn University Theses and Dissertations (Chula ETD)
Titanium dioxide and nitrogen-silicon-codoped titanium dioxide were prepared by two different ways. The first method was prepared by using nitrogen as a nitrogen source and silicon-containing chemical as a silicon source via solvothermal- and sol-gel-made photocatalysts. The nitrogen-silicon-codoped titanium dioxide showed the highest photocatalytic activity under both UV and visible light irradiation. The addition of silicon resulted in the formation of partial monolayer of silicon on titanium dioxide and an increase of the anatase phase stability. The annealing atmosphere affected the distribution concentration of surface and interface species such as surface oxygen and Ti3+ sites, thus improving photocatalytic activity. Moreover, …
A Study Of Catalyst Type And Dispersion On Pyrolysis Of High Density Polyethylene,
2017
Faculty of Engineering
A Study Of Catalyst Type And Dispersion On Pyrolysis Of High Density Polyethylene, Ratchanon Chantanuson
Chulalongkorn University Theses and Dissertations (Chula ETD)
The study of catalyst type and dispersion on pyrolysis of high density polyethylene (HDPE) was investigated in batch and semi-batch reactor system. The separation system in semi-batch was rapidly separated between oil and gas products while in batch system was separated after cooling down process. The obtained oil products in semi-batch system had higher in short-chain hydrocarbon. Because the increased pressure and the high severity in batch system led to occur side reactions. Two types of catalyst were studied, Cat A was acid catalyst with 200 m2/g surface area and 20 A average pore diameter and HZSM-5 zeolite was stronger …
Effect Of Amino Propanol Structure On Carbon Dioxide Absorption,
2017
Faculty of Engineering
Effect Of Amino Propanol Structure On Carbon Dioxide Absorption, Rossukon Nimcharoen
Chulalongkorn University Theses and Dissertations (Chula ETD)
Currently, global warming is the main issue on environmental concern due to the higher amount of carbon dioxide (CO2) in the atmosphere.The current technology to remove CO2 effectively is carbon capture and storage or CCS, especially absorption with aqueous amine solutions. The commonly used amine solutions are monoethanolamine (MEA). They have some disadvantages like low capacity. Therefore, a new solvent such as 3-amino-1-propanol (3A1P), 3-dimethylamino-1-proapnol (3DMA1P) and 1-dimethylamino-2-proapnol (1DMA2P) have been designed to be used as alternative solvents for CO2 removal. In this work, the solubility of carbon dioxide in new promising solvents. The effect of solvent concentration is studied …
Improving The Efficiency Of Dye-Sensitized Solar Cells With Spray-Coated Tio2 Electrode Modified By Cuo, Nio, Or In2o3,
2017
Faculty of Engineering
Improving The Efficiency Of Dye-Sensitized Solar Cells With Spray-Coated Tio2 Electrode Modified By Cuo, Nio, Or In2o3, Sakun Preedavijitkul
Chulalongkorn University Theses and Dissertations (Chula ETD)
This research investigated the application of the CuO/TiO2, NiO/TiO2, or In2O3/TiO2 thin film electrode in dye-sensitized solar cells (DSSCs). Second metal oxide and TiO2 sols were synthesized separately via sol-gel methods. The sols were mixed and sprayed onto the fluorine-doped tin oxide glass substrates. The amount of second metal oxide added to TiO2 was varied at 0, 0.1, 0.5, 1.0, and 3.0%wt. The electrode layer was sintered at 400˚C for two hours. The addition of CuO, NiO, and In2O3 produced the photovoltaic efficiency of the cell 4.03±0.58% with 0.1%wt. CuO/TiO2, 5.17±0.07% with 0.5%wt. NiO/TiO2, and 6.21±0.87% with 1.0%wt. In2O3/TiO2, respectively. …
Comparison Of Zsm - 5 And Poss Nanocomposite Pervaporation Membranes For Furfural/Water Separation,
2017
Faculty of Engineering
Comparison Of Zsm - 5 And Poss Nanocomposite Pervaporation Membranes For Furfural/Water Separation, Seth Sawatdiruk
Chulalongkorn University Theses and Dissertations (Chula ETD)
The recovery of furfural via a conventional separation technology like distillation and solvent extraction requires very large energy consumption and high amount of chemical solvent. Thus, there is a need for an alternative separation process that is economic and more energy friendly for the furfural recovery. Pervaporation is a well - recognized energy friendly and effective separation tool. If there is suitable pervaporation membrane with efficient separation performance, the pervaporation can be a promising replacement for the conventional separation method. Therefore, this thesis aims to develop a suitable membrane for furfural recovery via pervaporation process. In this work, the polydimethylsiloxane …
Development Of Graphite/Graphene/Carbon Nanotubes Filled Benzoxazine Composites For Bipolar Plates In Fuel Cell Applications,
2017
Faculty of Engineering
Development Of Graphite/Graphene/Carbon Nanotubes Filled Benzoxazine Composites For Bipolar Plates In Fuel Cell Applications, Sirawit Witpathomwong
Chulalongkorn University Theses and Dissertations (Chula ETD)
This research aims to develop bipolar plate from polymer composite to be used in proton exchange membrane fuel cells. The key properties of bipolar plates include high thermal conductivity, high electrical conductivity, high flexural strength and modulus, and low water absorption. The polybenzoxazine composites having three types of carbon derivatives i.e. graphite, graphene, and carbon nanotubes were prepared using a compression molder with a pressure of 15 MPa and a temperature of 200oC for 2 hours. The effects of carbon nanotube contents varying from 0-2wt% at an expense of graphite with constant content of graphene and benzoxazine at 7.5 and …
