Evaluation on the Stability of Amine-Mesoporous Silica Adsorbents used for CO2 Capture
Amine-mesoporous silica has been considered as a promising CO2 adsorbent with high potential for the reduction of energy consumption and CO2 capture cost; however, its stability could greatly vary with synthetic method. In this study, adsorbents prepared by impregnating different amines including...
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| Main Authors: | , , , , , |
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| 格式: | Article |
| 語言: | English |
| 出版: |
H. : ĐHQGHN
2020
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| 主題: | |
| 在線閱讀: | http://repository.vnu.edu.vn/handle/VNU_123/74829 https://doi.org/10.25073/2588-1094/vnuees.4549 |
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| 總結: | Amine-mesoporous silica has been considered as a promising CO2 adsorbent with high
potential for the reduction of energy consumption and CO2 capture cost; however, its stability could
greatly vary with synthetic method. In this study, adsorbents prepared by impregnating different
amines including polyethylenimine (PEI) and 3-aminopropyltriethoxysilane (APTES) onto
mesoporous silica were used to evaluate the effect of amines selection on the stability of adsorbents
used in CO2 capture process. Results revealed that APTES impregnated mesoporous silica (APTESMPS) is more stable than PEI-impregnated mesoporous silica (PEI-MPS); APTES-MPS was
thermally decomposed at ≈280 oC, while PEI-MPS was thermally decomposed at ≈180 oC only. PEIMPS was particularly less stable when operating under dry condition; its CO2 adsorption capacity
reduced by 22.1% after 10 adsorption/regeneration cycles, however, the capacity can be significantly
improved in humid condition. APTES-MPS showed a greater stability with no significant reduction
in CO2 capture capacity after 10 adsorption/regeneration cycles. In general, APTES-MPS adsorbent
possesses a higher stability compared to PEI-MPS thanks to the formation of chemical bonds
between amino-functional groups and mesoporous silica substrate |
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