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Katsunori Yogo - One of the best experts on this subject based on the ideXlab platform.
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degradation behavior of purified components of Tetraethylenepentamine impregnated solid sorbents for co2 capture
Social Science Research Network, 2021Co-Authors: Hidetaka Yamada, Firoz Alam Chowdhury, Katsunori YogoAbstract:Amine functionalized materials have been widely investigated as promising candidates for CO2 capture. Tetraethylenepentamine (TEPA) is the commercial amine that has been commonly impregnated into porous supports for post-combustion CO2 capture. Commercial technical-grade TEPA is a mixture of four main ethyleneamine compounds with close boiling points including linear, branched, and two cyclic TEPA products. This study investigated the stability of the four main components of TEPA under accelerated oxidizing conditions. The CO2 adsorption performances of the sorbents containing TEPA components decreased after the exposure to O2. Among the isolated components in commercial TEPA, 1,4,7,10,13-pentaazatridecane displayed the most sensitivity to O2, which were supported by infrared spectroscopic, gas chromatography, and NMR analysis.
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enhancement mechanism of the co2 adsorption desorption efficiency of silica supported Tetraethylenepentamine by chemical modification of amino groups
ACS Sustainable Chemistry & Engineering, 2019Co-Authors: Hidetaka Yamada, Firoz Alam Chowdhury, Junpei Fujiki, Katsunori YogoAbstract:Tetraethylenepentamine (TEPA) and its derivatives were used to functionalize mesocellular silica foam (MSU-F) supports by wet impregnation for utilization as solid sorbents for CO2 capture. TEPA de...
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oxidative degradation of Tetraethylenepentamine impregnated silica sorbents for co2 capture
Energy & Fuels, 2019Co-Authors: Hidetaka Yamada, Katsunori YogoAbstract:The stability of silica impregnated with commercial Tetraethylenepentamine (TEPA) under accelerated oxidizing conditions was evaluated, and the changes in the composition of sorbents during oxidati...
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effect of isopropyl substituent introduction into Tetraethylenepentamine based solid sorbents for co2 capture
Fuel, 2018Co-Authors: Hidetaka Yamada, Firoz Alam Chowdhury, Junpei Fujiki, Katsunori YogoAbstract:Abstract Chemical modification of the amino functional groups of amine-impregnated solid sorbents is an effective strategy for drastically improving the regeneration performance for CO2 capture. In this study, isopropyl groups were introduced into Tetraethylenepentamine (TEPA) to obtain N-(isopropyl)-TEPA (IP-TEPA), which was impregnated in mesocellular silica foam (MSU-F). The obtained solid sorbent enabled low-temperature regeneration with a low regeneration energy. To clarify the role of the IP groups, experimental and computational methods were used to compare the IP-TEPA/MSU-F sorbent with TEPA/MSU-F in terms of CO2 working capacity, reaction product stability, self-diffusion coefficient, 13C spin–lattice relaxation time, and CO2 capture performance in steam-aided vacuum swing adsorption.
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carbon dioxide absorption using solid sorbents incorporating purified components of Tetraethylenepentamine
Energy technology, 2017Co-Authors: Ryohei Numaguchi, Hidetaka Yamada, Firoz Alam Chowdhury, Katsunori YogoAbstract:Tetraethylenepentamine (TEPA) components are separated by fractional distillation, and the structure of each fraction is established using spectroscopic methods. Then, solid sorbents incorporating these components are prepared, and the capacities and rates of CO2 absorption of the sorbents are evaluated to elucidate how the molecular structure affects the absorption performance.
Hidetaka Yamada - One of the best experts on this subject based on the ideXlab platform.
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degradation behavior of purified components of Tetraethylenepentamine impregnated solid sorbents for co2 capture
Social Science Research Network, 2021Co-Authors: Hidetaka Yamada, Firoz Alam Chowdhury, Katsunori YogoAbstract:Amine functionalized materials have been widely investigated as promising candidates for CO2 capture. Tetraethylenepentamine (TEPA) is the commercial amine that has been commonly impregnated into porous supports for post-combustion CO2 capture. Commercial technical-grade TEPA is a mixture of four main ethyleneamine compounds with close boiling points including linear, branched, and two cyclic TEPA products. This study investigated the stability of the four main components of TEPA under accelerated oxidizing conditions. The CO2 adsorption performances of the sorbents containing TEPA components decreased after the exposure to O2. Among the isolated components in commercial TEPA, 1,4,7,10,13-pentaazatridecane displayed the most sensitivity to O2, which were supported by infrared spectroscopic, gas chromatography, and NMR analysis.
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enhancement mechanism of the co2 adsorption desorption efficiency of silica supported Tetraethylenepentamine by chemical modification of amino groups
ACS Sustainable Chemistry & Engineering, 2019Co-Authors: Hidetaka Yamada, Firoz Alam Chowdhury, Junpei Fujiki, Katsunori YogoAbstract:Tetraethylenepentamine (TEPA) and its derivatives were used to functionalize mesocellular silica foam (MSU-F) supports by wet impregnation for utilization as solid sorbents for CO2 capture. TEPA de...
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oxidative degradation of Tetraethylenepentamine impregnated silica sorbents for co2 capture
Energy & Fuels, 2019Co-Authors: Hidetaka Yamada, Katsunori YogoAbstract:The stability of silica impregnated with commercial Tetraethylenepentamine (TEPA) under accelerated oxidizing conditions was evaluated, and the changes in the composition of sorbents during oxidati...
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effect of isopropyl substituent introduction into Tetraethylenepentamine based solid sorbents for co2 capture
Fuel, 2018Co-Authors: Hidetaka Yamada, Firoz Alam Chowdhury, Junpei Fujiki, Katsunori YogoAbstract:Abstract Chemical modification of the amino functional groups of amine-impregnated solid sorbents is an effective strategy for drastically improving the regeneration performance for CO2 capture. In this study, isopropyl groups were introduced into Tetraethylenepentamine (TEPA) to obtain N-(isopropyl)-TEPA (IP-TEPA), which was impregnated in mesocellular silica foam (MSU-F). The obtained solid sorbent enabled low-temperature regeneration with a low regeneration energy. To clarify the role of the IP groups, experimental and computational methods were used to compare the IP-TEPA/MSU-F sorbent with TEPA/MSU-F in terms of CO2 working capacity, reaction product stability, self-diffusion coefficient, 13C spin–lattice relaxation time, and CO2 capture performance in steam-aided vacuum swing adsorption.
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carbon dioxide absorption using solid sorbents incorporating purified components of Tetraethylenepentamine
Energy technology, 2017Co-Authors: Ryohei Numaguchi, Hidetaka Yamada, Firoz Alam Chowdhury, Katsunori YogoAbstract:Tetraethylenepentamine (TEPA) components are separated by fractional distillation, and the structure of each fraction is established using spectroscopic methods. Then, solid sorbents incorporating these components are prepared, and the capacities and rates of CO2 absorption of the sorbents are evaluated to elucidate how the molecular structure affects the absorption performance.
Maohong Fan - One of the best experts on this subject based on the ideXlab platform.
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modified carbon nanotubes Tetraethylenepentamine for co2 capture
Fuel, 2017Co-Authors: Maryam Irani, Andrew T Jacobson, Khaled A M Gasem, Maohong FanAbstract:Abstract In this work, a CO 2 sorbent was prepared by immobilizing Tetraethylenepentamine (TEPA) onto modified carbon nanotubes. Modification of carbon nanotubes (CNTs) using a KOH reagent was done to increase the surface area and pore volume of the CNTs. The prepared sorbents were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM) thermogravimetric analysis (TGA), and Brunauer-Emmett-Teller (BET) analyses. At the optimal TEPA loading of 75 wt% on modified CNTs (MCNTs), the CO 2 sorption capacity reached 5 mmol CO 2 /g-sorbent for 10 vol% CO 2 in N 2 along with 1 vol% H 2 O at 60 °C. Kinetic and thermodynamic adsorption studies found activation energies for CO 2 adsorption and desorption of MCNTs/TEPA being16.2 kJ/mol and 39.9 kJ/mol, respectively. The low activation energy for CO 2 desorption using MCNTs/TEPA corresponds with a high CO 2 desorption rate, resulting in a low CO 2 capture cost. Therefore, the MCNTs/TEPA sorbent has potential for application to CO 2 capture from gas mixtures.
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co2 capture using nanoporous tio oh 2 Tetraethylenepentamine
Fuel, 2016Co-Authors: Maryam Irani, Khaled A M Gasem, Bryce Dutcher, Maohong FanAbstract:Abstract In this work, an inorganic-organic CO2 sorbent was prepared by immobilizing Tetraethylenepentamine (TEPA) onto nanoporous titanium oxyhydrate (TiO(OH)2). The prepared sorbents were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and Brunauer-Emmett-Teller (BET) analyses. At the optimal TEPA loading of 60 wt% on TiO(OH)2, the CO2 sorption capacity reached 3.1 mmol CO2/g-sorbent for 1 vol% CO2 in N2 along with ∼1 vol% H2O at 60 °C. Studies of adsorption kinetics and thermodynamics showed that the activation energies for CO2 adsorption and desorption of TiO(OH)2/TEPA are 19.6 kJ/mol and 51.1 kJ/mol, respectively. This low CO2 desorption activation energy means a high CO2 desorption rate, thus a low CO2 capture cost. Accordingly, the sorbent has the potential to be used for capturing ultra-dilute CO2 from gas mixtures.
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Tetraethylenepentamine modified protonated titanate nanotubes for co2 capture
Fuel Processing Technology, 2015Co-Authors: Liping Guo, Maohong Fan, Jie Chen, Wei Dai, Herbert DacostaAbstract:Abstract Protonated titanate nanotube (PTNT) with large pore size and high pore volume synthesized by a hydrothermal method was modified with different amounts of Tetraethylenepentamine (TEPA) through wet impregnation for CO 2 adsorption. The as-synthesized adsorbents were characterized by different techniques such as nitrogen adsorption, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, powder X-ray diffraction, and thermogravimetric analysis. CO 2 capture performances of the sorbents were tested by a fixed-bed reactor equipped with an on-line gas chromatograph. The CO 2 capacity of PTNT with 60 wt.% TEPA loading was as high as 4.13 mmol/g under the conditions of 10.0% (v/v) CO 2 in N 2 at 75 °C, which is higher than those achieved with analogue TEPA impregnated SBA-15 and many other previously reported TEPA-impregnated materials. The high CO 2 uptake is probably due to the large pore size and high pore volume of PTNT support combined with its special surface characteristics. Cyclic CO 2 adsorption–desorption tests demonstrated the excellent regenerability and stability of the PTNT-based sorbent. The high CO 2 uptake, positive effect of moisture and good recyclability of TEPA modified PTNT demonstrate its great potential in capture of CO 2 from flue gas.
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modified nanosepiolite as an inexpensive support of Tetraethylenepentamine for co2 sorption
Nano Energy, 2015Co-Authors: Maryam Irani, Maohong Fan, Bryce Dutcher, Hanafi Ismail, Abdulwahab Tuwati, Armistead G RussellAbstract:Abstract In this work, an inorganic-organic CO2 sorbent was prepared by immobilizing Tetraethylenepentamine (TEPA) onto acid-modified nanosepiolite, a low cost and widely available clay. Nanosepiolite was pre-modified with acid treatment to enhance its surface area, increasing the surface area from 103.4 to 272.45 m2/g. The prepared sorbents were characterized using X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, transmission electron microscopy, thermogravimetric analysis, and BET (Brunauer-Emmett-Teller) analysis. At the optimal TEPA loading of 60 wt.% on the modified nanosepiolite, the CO2 sorption capacity reached 3.8 mmol CO2/g-sorbent for 1 vol.% CO2 in N2 along with ~1 vol.% H2O at 60 °C. Studies show that the sorbent has a high CO2 adsorption rate that is beneficial to the reduction of CO2 capture capital costs. The polymer composite has the potential to be applied as a solid sorbent for capture of ultra-dilute CO2 from gas mixtures.
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Tetraethylenepentamine modified silica nanotubes for low temperature co2 capture
Energy & Fuels, 2013Co-Authors: Manli Yao, Xingxing Feng, Guanqun Xie, Mengfei Luo, Yanyan Dong, Aiping Jia, Maohong FanAbstract:The objective of this research is to develop a new type of CO2 sorbent. The sorbents were synthesized with mesoporous ethane–silica nanotubes (E–SNTs) and Tetraethylenepentamine (TEPA). They were characterized by nitrogen adsorption/desorption, thermogravimetric analysis, and infrared spectroscopy. A fixed-bed reactor equipped with an online mass spectrometer was used to test the CO2 capture performances of the sorbents. It was found that 75 °C is the optimal CO2 adsorption temperature for amine-impregnated E–SNT sorbents. The highest CO2 sorption capacities achieved with E–SNTs with 50 wt % TEPA loading (E–SNTs–50%) without and with uses of water vapor are 3.58 and 4.74 mmol/g, respectively, under the conditions of a 10.0% CO2/N2 mixture at 75 °C. Cyclic CO2 adsorption–desorption test results indicate that the new composite sorbents are stable and regenerable.
Firoz Alam Chowdhury - One of the best experts on this subject based on the ideXlab platform.
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degradation behavior of purified components of Tetraethylenepentamine impregnated solid sorbents for co2 capture
Social Science Research Network, 2021Co-Authors: Hidetaka Yamada, Firoz Alam Chowdhury, Katsunori YogoAbstract:Amine functionalized materials have been widely investigated as promising candidates for CO2 capture. Tetraethylenepentamine (TEPA) is the commercial amine that has been commonly impregnated into porous supports for post-combustion CO2 capture. Commercial technical-grade TEPA is a mixture of four main ethyleneamine compounds with close boiling points including linear, branched, and two cyclic TEPA products. This study investigated the stability of the four main components of TEPA under accelerated oxidizing conditions. The CO2 adsorption performances of the sorbents containing TEPA components decreased after the exposure to O2. Among the isolated components in commercial TEPA, 1,4,7,10,13-pentaazatridecane displayed the most sensitivity to O2, which were supported by infrared spectroscopic, gas chromatography, and NMR analysis.
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enhancement mechanism of the co2 adsorption desorption efficiency of silica supported Tetraethylenepentamine by chemical modification of amino groups
ACS Sustainable Chemistry & Engineering, 2019Co-Authors: Hidetaka Yamada, Firoz Alam Chowdhury, Junpei Fujiki, Katsunori YogoAbstract:Tetraethylenepentamine (TEPA) and its derivatives were used to functionalize mesocellular silica foam (MSU-F) supports by wet impregnation for utilization as solid sorbents for CO2 capture. TEPA de...
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effect of isopropyl substituent introduction into Tetraethylenepentamine based solid sorbents for co2 capture
Fuel, 2018Co-Authors: Hidetaka Yamada, Firoz Alam Chowdhury, Junpei Fujiki, Katsunori YogoAbstract:Abstract Chemical modification of the amino functional groups of amine-impregnated solid sorbents is an effective strategy for drastically improving the regeneration performance for CO2 capture. In this study, isopropyl groups were introduced into Tetraethylenepentamine (TEPA) to obtain N-(isopropyl)-TEPA (IP-TEPA), which was impregnated in mesocellular silica foam (MSU-F). The obtained solid sorbent enabled low-temperature regeneration with a low regeneration energy. To clarify the role of the IP groups, experimental and computational methods were used to compare the IP-TEPA/MSU-F sorbent with TEPA/MSU-F in terms of CO2 working capacity, reaction product stability, self-diffusion coefficient, 13C spin–lattice relaxation time, and CO2 capture performance in steam-aided vacuum swing adsorption.
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carbon dioxide absorption using solid sorbents incorporating purified components of Tetraethylenepentamine
Energy technology, 2017Co-Authors: Ryohei Numaguchi, Hidetaka Yamada, Firoz Alam Chowdhury, Katsunori YogoAbstract:Tetraethylenepentamine (TEPA) components are separated by fractional distillation, and the structure of each fraction is established using spectroscopic methods. Then, solid sorbents incorporating these components are prepared, and the capacities and rates of CO2 absorption of the sorbents are evaluated to elucidate how the molecular structure affects the absorption performance.
Sunghyun Park - One of the best experts on this subject based on the ideXlab platform.
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thermal stability enhanced Tetraethylenepentamine silica adsorbents for high performance co2 capture
Industrial & Engineering Chemistry Research, 2018Co-Authors: Sunghyun Park, Keunsu Choi, Young June Won, Chaehoon Kim, Minkee Choi, So Hye Cho, Jung Hyun Lee, Seung Yong Lee, Jong Suk LeeAbstract:Tetraethylenepentamine (TEPA), consisting mainly of primary and secondary amines, exhibits a high CO2 sorption capacity; however, its poor thermal stability hampers practical utilization in the temperature swing adsorption process for CO2 capture. Here, a facile functionalization of TEPA with 1,2-epoxybutane (EB) substantially enhanced its thermal stability as well as the CO2 adsorption kinetics. Our careful analysis on the liquid-state 13C NMR disclosed the amine state distribution of EB-functionalized TEPA (EB-TEPA). Although the increase in tertiary amine portion induced by EB-functionalization reduced CO2 sorption capacity, the 0.64EB-TEPA (i.e., TEPA functionalized with EB with a TEPA/EB molar ratio of 1:3)/SiO2 showed an excellent long-term stability over the 10 consecutive cycles of adsorption/desorption processes with a CO2 swing capacity of 2.0 mmol CO2 g–1 under dry CO2/N2 (15/85 mol/mol) feed conditions. Also, the first-principles calculation identified the configuration of modified TEPA molecu...
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Thermal Stability Enhanced Tetraethylenepentamine/Silica Adsorbents for High Performance CO2 Capture
2018Co-Authors: Sunghyun Park, Keunsu Choi, Young June Won, Chaehoon Kim, Minkee Choi, So Hye Cho, Jung Hyun Lee, Seung Yong Lee, Jong Suk LeeAbstract:Tetraethylenepentamine (TEPA), consisting mainly of primary and secondary amines, exhibits a high CO2 sorption capacity; however, its poor thermal stability hampers practical utilization in the temperature swing adsorption process for CO2 capture. Here, a facile functionalization of TEPA with 1,2-epoxybutane (EB) substantially enhanced its thermal stability as well as the CO2 adsorption kinetics. Our careful analysis on the liquid-state 13C NMR disclosed the amine state distribution of EB-functionalized TEPA (EB-TEPA). Although the increase in tertiary amine portion induced by EB-functionalization reduced CO2 sorption capacity, the 0.64EB-TEPA (i.e., TEPA functionalized with EB with a TEPA/EB molar ratio of 1:3)/SiO2 showed an excellent long-term stability over the 10 consecutive cycles of adsorption/desorption processes with a CO2 swing capacity of 2.0 mmol CO2 g–1 under dry CO2/N2 (15/85 mol/mol) feed conditions. Also, the first-principles calculation identified the configuration of modified TEPA molecules with XRD measurements, supporting an easy access of CO2 into amine moieties of our modified TEPA molecules
