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首页> 外文期刊>Carbon: An International Journal Sponsored by the American Carbon Society >Improving low-pressure CO2 capture performance of N-doped active carbons by adjusting flow rate of protective gas during alkali activation
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Improving low-pressure CO2 capture performance of N-doped active carbons by adjusting flow rate of protective gas during alkali activation

机译:通过在碱活化期间调节保护气体的流速来改善N掺杂活性碳的低压CO2捕获性能

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摘要

Alkali-activated N-doped active carbon (AC) is a promising material for capturing CO2, but the possible role of flow rate of protective gas during alkali activation in adjusting CO2 capture performance of AC is unknown. In this study, N-doped ACs for low-pressure CO2 capture were prepared from chitosan char by KOH activation under flowing N-2 to study the effects of protective-gas flow rate on ultramicropore volume, chemical composition, and CO2 capture performance of ACs. The results showed that increasing the flow rate changed the low-pressure CO2 uptake and CO2/N-2 selectivity by varying the ultramicropore volume and/or surface NBC ratio of ACs. Adopting a moderate flow rate during AC preparation was most favorable for enhancing low-pressure CO2 capture performance. The sample prepared at this flow rate displayed high CO2/N-2 selectivity, excellent recyclability, and moreover, a CO2 uptake of 1.86 mmol/g (0.15 bar, 25 degrees C) which ranked among the highest values ever reported for N-doped ACs. This research revealed that controlling gas flow rate was an effective strategy to improve the CO2 capture performance of ACs and should be taken seriously during preparation of ACs for CO2 capture. (C) 2016 Elsevier Ltd. All rights reserved.
机译:碱活化的N掺杂活性炭(AC)是用于捕获CO2的有希望的材料,但保护气体在调整AC调节CO2捕获性能时保护气体在碱活化期间的可能作用是未知的。在该研究中,通过在流动的N-2下通过KOH活化来制备用于低压CO2捕获的N掺杂ACS,以研究保护气流量,化学成分和ACS的CO2捕获性能的保护 - 气体流速的影响。结果表明,通过改变AC的超微孔体积和/或表面NBC比例,增加流速改变了低压CO2吸收和CO2 / N-2选择性。采用AC制剂期间的中等流速最有利,可以增强低压CO2捕获性能。在该流速中制备的样品显示出高CO 2 / N-2选择性,优异的可再循环性,并且提供1.86mmol / g(0.15巴,25℃)的CO 2吸收,该含量为N-掺杂的最高值ACS。该研究表明,控制气体流速是改善ACS的二氧化碳捕获性能的有效策略,并且应在编制CO2捕获的ACS期间认真进行。 (c)2016 Elsevier Ltd.保留所有权利。

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