| Summary: | 碩士 === 國立中興大學 === 環境工程學系所 === 100 === Carbon nanotubes (CNTs) were modified by 3-aminopropyltriethoxysilane (APTS) and were employed as sorbents of CO2 from gas streams by dual-bed adsorber packed. This study investigates the adsorption behavior as well as their regeneration and desorption properties in different operation conditions to increase the effect of water vapor, SO2 and NOx. The adsorption capacities (qw) of CNT(APTS) was 61.0 mg/g in dry system under 15% CO2 at 25 °C. When the TSA/VSA optimal conditions were at 150 °C and 0.1 bar, the qw decreased to 41.2 mg/g and the ratio of CO2 concentrate was 57.9 %. The qw was 41.5 mg/g and the ratio of CO2 concentrate was 53.1 % after 10 cycles. Under the same conditions with 100 %(v/v) of water content, the qw of CNT(APTS) upgraded to 86.9 mg/g and the ratio of CO2 concentrate also upgraded to 82 %. The qw was 68.8 mg/g and the ratio of CO2 concentrate was 69 % after 10 cycles. When the inflow gas contained SO2, the CNT(APTS) on the adsorption of CO2 performance degraded about 9 to 13 mg/g. When the inflow gas contained NOx, the CNT(APTS) would not affect the adsorption of CO2 performance. Using dual-bed adsorber packed to operate 100 cycles of adsorption/desorption with TSA/VSA process, the qw decreased to 38.09 mg/g and the ratio of CO2 concentrate was 56.5% under 15% CO2 at 25 °C conditions in dry system. At the same conditions with 100 % (v/v) of water content, the qw upgraded to 63.3 mg/g and the ratio of CO2 concentrate was 69%. For these reasons, CNT(APTS) is possibility of prolonged cyclic operation and promising adsorbent for CO2 capture from flue gas.
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