Yao Shunyang, Li Zhi, Liu Zhen, Geng Xiaodong, Dai Li, Wang Yanmei
College of Forestry, Henan Agricultural University, Zhengzhou, Henan 45002, China.
ACS Omega. 2023 Oct 26;8(44):41641-41648. doi: 10.1021/acsomega.3c05842. eCollection 2023 Nov 7.
Porosity is the key factor in determining the CO capture capacity for porous carbon-based adsorbents, especially narrow micropores of less than 1.0 nm. Unfortunately, this desired feature is still a great challenge to tailor micropores by an effective, low-corrosion, and environmentally friendly activating agent. Herein, we reported a suitable dynamic porogen of CuCl to engineer microporous carbons rich in narrow micropores of <1.0 nm for solving the above problem. The porosity can be easily tuned by varying the concentration of the CuCl porogen. The resultant porous carbons exhibited a multiscale micropore size, high micropore volume, and suitable surface nitrogen doping content, especially high-proportioned ultromicropores of <0.7 nm. As adsorbents for capturing CO, the obtained microporous carbons possess satisfactory CO uptake, moderate heat of CO adsorption, reasonable CO/N selectivity, and easy regeneration. Our work proposes an alternative way to design porous carbon-based adsorbents for efficiently capturing CO from the postcombustion flue gases. More importantly, this work opens up an almost-zero cost and industrially friendly route to convert biowaste into high-added-value adsorbents for CO capture in an industrial practical application.
孔隙率是决定多孔碳基吸附剂CO捕集能力的关键因素，尤其是小于1.0 nm的狭窄微孔。不幸的是，要通过一种有效、低腐蚀且环境友好的活化剂来定制微孔仍然是一个巨大的挑战。在此，我们报道了一种合适的动态致孔剂CuCl，用于设计富含<1.0 nm狭窄微孔的微孔碳，以解决上述问题。通过改变CuCl致孔剂的浓度，可以轻松调节孔隙率。所得的多孔碳呈现出多尺度的微孔尺寸、高微孔体积和合适的表面氮掺杂含量，尤其是比例较高的<0.7 nm的超微孔。作为捕集CO的吸附剂，所获得的微孔碳具有令人满意的CO吸附量、适中的CO吸附热、合理的CO/N选择性以及易于再生的特点。我们的工作提出了一种设计多孔碳基吸附剂的替代方法，用于从燃烧后烟道气中高效捕集CO。更重要的是，这项工作开辟了一条几乎零成本且对工业友好的途径，可将生物废料转化为用于工业实际应用中捕集CO的高附加值吸附剂。
