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Water Vapor and CO₂ Sorption and Transport in Carbon Molecular Sieve Membranes and Moisture Swing Materials
Water Vapor and CO₂ Sorption and Transport in Carbon Molecular Sieve Membranes and Moisture Swing Materials
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260311091544.5
- ISBN
- 9798270229191
- DDC
- 660.284
- 서명/저자
- Water Vapor and CO₂ Sorption and Transport in Carbon Molecular Sieve Membranes and Moisture Swing Materials / Horacio Lopez Marques
- 발행사항
- [Sl] : The University of Texas at Austin, 2025
- 형태사항
- 1 electronic resource (156 pages)
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-06, Section: B.
- 주기사항
- Advisors: Freeman, Benny D.; Kumar, Manish Committee members: Wade, Jennifer L.; Lynd, Nathaniel A.; Brennecke, Joan F.
- 학위논문주기
- - Ph.D. : The University of Texas at Austin, 2025.
- 초록/해제
- 요약Carbon Molecular Sieve (CMS) membranes have been extensively studied for gas separations. Many gas separation applications involve humidified streams, but reports on water vapor transport in CMS membranes are limited. In this study, water permeability, diffusivity, and solubility were determined as a function of water activity for CMS membranes. Water transport properties of membranes synthesized at different pyrolysis temperatures (550 °C and 800 °C) and with different polyimide precursors were examined. Water sorption followed Type V isotherms as previously observed for the adsorption of water in microporous carbons. Water permeability was much higher at all water activity values for CMS samples prepared at lower pyrolysis temperature. Water permeabilities as a function of water activity of the three different polyimides pyrolyzed at 800 °C were very similar. Water permeability of CMS membranes was high compared to many other polymeric materials, showing potential for dehydration applications. Water vapor sorption and transport is of major importance to many industries, including membrane air and gases dehumidification, packaging and clothing materials, protective apparel, and humidity control in closed environments. However, water vapor sorption and transport measurements are challenging and require systematic experimental protocols for their accurate determination. Pure and multicomponent water vapor sorption in polymeric materials is also of a major importance for Direct Air Capture (DAC). In DAC, sorbents are exposed to ambient air with different levels of relative humidity (%RH). There are many reports on pure water and pure CO2 sorption in sorbents, but reports on mixed water and CO2 sorption are very limited due to the difficulty of obtaining accurate experimental data, and the need for careful design of custom-made equipment. Here, we describe the construction and operation of a multicomponent closed system to determine CO2 sorption in sorbent materials as a function of %RH, CO2 partial pressure, and temperature. An Infrared Gas Analyzer (IRGA) was incorporated into the system to measure CO2 and water concentration in real time without altering experimental conditions due to gas sampling. Blank experiments showed that no CO2 and/or water was sorbed in the system itself, and any change in gas concentration was due to sorption in the sorbent. To validate the system operation, CO2 sorption capacities in a commercial material were measured, and the results were compared to a literature report, yielding satisfactory agreement. Moisture-swing (MS) sorption is a promising DAC technology to achieve negative CO2 emissions and counteract global warming. In this work, MS CO2 sorption in a model MS sorbent, IRA900, was comprehensively investigated. IRA900 is a macroporous commercial strong base anion exchange resin (AER) with quaternary ammonium functional groups. A rigorous CO2 desorption process was developed to desorb all the CO2 from the sample to obtain the CO2 sorption isotherms as a function of relative humidity, CO2 partial pressure, and temperature. Remarkably, the total CO2 uptake in the sorption isotherms matched the ion exchange capacity (IEC) of the material, suggesting a stoichiometry of one CO2 molecule reacting per active site. An isotherm model for CO2 sorption starting with empty sorption sites (i.e. in the OH- form) described the experimental data well, supporting the hypothesis that the bicarbonate loaded AER unloaded fully to the OH- state following rigorous CO2 desorption. CO2 sorption kinetics were studied, and carbon diffusion coefficients were estimated as a function of %RH, and CO2 partial pressure.
- 언어주기
- English
- 일반주제명
- Energy
- 일반주제명
- Environmental science
- 일반주제명
- Analytical chemistry
- 키워드
- Water vapors
- 키워드
- CO₂ sorption
- 기타저자
- The University of Texas at Austin Chemical Engineering
- 기본자료저록
- Dissertations Abstracts International. 87-06B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■020 ▼a9798270229191
■040 ▼aMiAaPQD▼beng▼cMiAaPQD▼erda
■082 ▼a660.284
■1001 ▼aLopez Marques, Horacio▼eauthor.
■24510▼aWater Vapor and CO₂ Sorption and Transport in Carbon Molecular Sieve Membranes and Moisture Swing Materials ▼cHoracio Lopez Marques
■260 ▼a[Sl]▼bThe University of Texas at Austin▼c2025
■264 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a1 electronic resource (156 pages)
■336 ▼atext▼btxt▼2rdacontent
■337 ▼acomputer▼bc▼2rdamedia
■338 ▼aonline resource▼bcr▼2rdacarrier
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-06, Section: B.
■500 ▼aAdvisors: Freeman, Benny D.; Kumar, Manish Committee members: Wade, Jennifer L.; Lynd, Nathaniel A.; Brennecke, Joan F.
■5021 ▼bPh.D.▼cThe University of Texas at Austin▼d2025.
■520 ▼aCarbon Molecular Sieve (CMS) membranes have been extensively studied for gas separations. Many gas separation applications involve humidified streams, but reports on water vapor transport in CMS membranes are limited. In this study, water permeability, diffusivity, and solubility were determined as a function of water activity for CMS membranes. Water transport properties of membranes synthesized at different pyrolysis temperatures (550 °C and 800 °C) and with different polyimide precursors were examined. Water sorption followed Type V isotherms as previously observed for the adsorption of water in microporous carbons. Water permeability was much higher at all water activity values for CMS samples prepared at lower pyrolysis temperature. Water permeabilities as a function of water activity of the three different polyimides pyrolyzed at 800 °C were very similar. Water permeability of CMS membranes was high compared to many other polymeric materials, showing potential for dehydration applications. Water vapor sorption and transport is of major importance to many industries, including membrane air and gases dehumidification, packaging and clothing materials, protective apparel, and humidity control in closed environments. However, water vapor sorption and transport measurements are challenging and require systematic experimental protocols for their accurate determination. Pure and multicomponent water vapor sorption in polymeric materials is also of a major importance for Direct Air Capture (DAC). In DAC, sorbents are exposed to ambient air with different levels of relative humidity (%RH). There are many reports on pure water and pure CO2 sorption in sorbents, but reports on mixed water and CO2 sorption are very limited due to the difficulty of obtaining accurate experimental data, and the need for careful design of custom-made equipment. Here, we describe the construction and operation of a multicomponent closed system to determine CO2 sorption in sorbent materials as a function of %RH, CO2 partial pressure, and temperature. An Infrared Gas Analyzer (IRGA) was incorporated into the system to measure CO2 and water concentration in real time without altering experimental conditions due to gas sampling. Blank experiments showed that no CO2 and/or water was sorbed in the system itself, and any change in gas concentration was due to sorption in the sorbent. To validate the system operation, CO2 sorption capacities in a commercial material were measured, and the results were compared to a literature report, yielding satisfactory agreement. Moisture-swing (MS) sorption is a promising DAC technology to achieve negative CO2 emissions and counteract global warming. In this work, MS CO2 sorption in a model MS sorbent, IRA900, was comprehensively investigated. IRA900 is a macroporous commercial strong base anion exchange resin (AER) with quaternary ammonium functional groups. A rigorous CO2 desorption process was developed to desorb all the CO2 from the sample to obtain the CO2 sorption isotherms as a function of relative humidity, CO2 partial pressure, and temperature. Remarkably, the total CO2 uptake in the sorption isotherms matched the ion exchange capacity (IEC) of the material, suggesting a stoichiometry of one CO2 molecule reacting per active site. An isotherm model for CO2 sorption starting with empty sorption sites (i.e. in the OH- form) described the experimental data well, supporting the hypothesis that the bicarbonate loaded AER unloaded fully to the OH- state following rigorous CO2 desorption. CO2 sorption kinetics were studied, and carbon diffusion coefficients were estimated as a function of %RH, and CO2 partial pressure.
■546 ▼aEnglish
■590 ▼aSchool code: 0227
■650 4▼aEnergy
■650 4▼aEnvironmental science
■650 4▼aAnalytical chemistry
■653 ▼aWater vapors
■653 ▼aCO₂ sorption
■653 ▼aCarbon Molecular Sieve
■7102 ▼aThe University of Texas at Austin▼bChemical Engineering.▼edegree granting institution.
■7201 ▼aFreeman, Benny D.▼edegree supervisor.
■7201 ▼aKumar, Manish▼edegree supervisor.
■7730 ▼tDissertations Abstracts International▼g87-06B.
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17361131▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
