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Ultramicroporous Carbon Molecular Sieve for Air Purification by Selective Adsorption Low-Concentration CO2 and VOC Molecules
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2023-05-08 , DOI: 10.1021/acs.iecr.3c00656 Yajun Wei 1 , Tan Zhao 1 , Jiawei Wang 1 , Yanli Chen 1 , Qiang Wang 2 , Xizheng Liu 1 , Yunfeng Zhao 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2023-05-08 , DOI: 10.1021/acs.iecr.3c00656 Yajun Wei 1 , Tan Zhao 1 , Jiawei Wang 1 , Yanli Chen 1 , Qiang Wang 2 , Xizheng Liu 1 , Yunfeng Zhao 1
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The development of an ultramicroporous (<7 Å) adsorbent with a narrow pore distribution for capturing and adsorbing gas molecules has received a lot of attention. In this paper, the commercial carbon molecular sieve (CMS) was used as the precursor, and a carbon molecular sieve (CMS-A-5) with better performance was obtained by activating with potassium hydroxide (KOH). After activation, the ultramicroporous volume increased from 0.163 cm3 g–1 (CMS) to 0.329 cm3 g–1 (CMS-A-5), and the CO2 capacity increased from 42.76 to 71.92 cm3 g–1 at 298 K and 1 bar. The breakthrough experiments demonstrated that the CO2 capture ability of CMS-A-5 increased by ∼9.5 times for the respiratory air containing CO2/O2/N2 (4:20:76) and was easily regenerated and reused. CMS-A-5 was also capable of selectively capturing VOC molecules including benzene, toluene, and C8 alkyl aromatics (BTEX) with a high adsorption capacity at a low pressure. The excellent CO2 and VOC molecule adsorption capacity make CMS-A-5 a promising candidate for selective separation of the gas mixture, in particular, for air purification in confined spaces.
中文翻译：
用于通过选择性吸附低浓度 CO2 和 VOC 分子净化空气的超微孔碳分子筛
用于捕获和吸附气体分子的具有窄孔分布的超微孔 (<7 Å) 吸附剂的开发受到了广泛关注。本文以市售碳分子筛（CMS）为前驱体，通过氢氧化钾（KOH）活化得到性能更优的碳分子筛（CMS-A-5）。活化后，超微孔体积从 0.163 cm 3 g –1 (CMS) 增加到 0.329 cm 3 g –1 (CMS-A-5)，CO 2容量在 298 K 时从 42.76 增加到 71.92 cm 3 g –1和 1 巴。突破性实验表明，CO 2CMS-A-5对含有CO 2 /O 2 /N 2 (4:20:76)的呼吸空气的捕获能力提高了~9.5倍，并且易于再生和重复使用。CMS-A-5还能够选择性地捕获VOC分子，包括苯、甲苯和C 8烷基芳烃（BTEX），在低压下具有高吸附能力。出色的 CO 2和 VOC 分子吸附能力使 CMS-A-5 成为选择性分离气体混合物的有前途的候选者，特别是用于密闭空间的空气净化。
更新日期：2023-05-08
中文翻译：
用于通过选择性吸附低浓度 CO2 和 VOC 分子净化空气的超微孔碳分子筛
用于捕获和吸附气体分子的具有窄孔分布的超微孔 (<7 Å) 吸附剂的开发受到了广泛关注。本文以市售碳分子筛（CMS）为前驱体，通过氢氧化钾（KOH）活化得到性能更优的碳分子筛（CMS-A-5）。活化后，超微孔体积从 0.163 cm 3 g –1 (CMS) 增加到 0.329 cm 3 g –1 (CMS-A-5)，CO 2容量在 298 K 时从 42.76 增加到 71.92 cm 3 g –1和 1 巴。突破性实验表明，CO 2CMS-A-5对含有CO 2 /O 2 /N 2 (4:20:76)的呼吸空气的捕获能力提高了~9.5倍，并且易于再生和重复使用。CMS-A-5还能够选择性地捕获VOC分子，包括苯、甲苯和C 8烷基芳烃（BTEX），在低压下具有高吸附能力。出色的 CO 2和 VOC 分子吸附能力使 CMS-A-5 成为选择性分离气体混合物的有前途的候选者，特别是用于密闭空间的空气净化。
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