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首页> 外文期刊>Environmental Science & Technology >Chemical Vapor Deposition on Chabazite (CHA) Zeolite Membranes for Effective Post-Combustion CO_2 Capture
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Chemical Vapor Deposition on Chabazite (CHA) Zeolite Membranes for Effective Post-Combustion CO_2 Capture

机译：在菱沸石（CHA）沸石膜上进行化学气相沉积以有效地燃烧后CO_2捕集

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摘要

Chabazite (CHA) zeolites with a pore size of 0.37 × 0.42 nm~2 are expected to separate CO_2 (0.33 nm) from larger N_2 (0.364 nm) in postcombustion flue gases by recognizing their minute size differences. Furthermore, the hydrophobic siliceous constituent in CHA membranes can allow for maintaining the CO_2/N_2 separation performance in the presence of H_2O in contrast with the CO_2 affinity-based membranes. In an attempt to increase the molecular sieving ability, the pore mouth size of all silica CHA (Si-CHA) particles was reduced via the chemical vapor deposition (CVD) of a silica precursor (tetraethyl orthosilicate). Accordingly, an increase of the CVD treatment duration decreased the penetration rate of CO_2 into the CVD-treated Si-CHA particles. Furthermore, the CVD process was applied to siliceous CHA membranes in order to improve their CO_2/N_2 separation performance. Compared to the intact CHA membranes, the CO_2/N_2 maximum separation factor (max SF) for CVD-treated CHA membranes was increased by ～2 fold under dry conditions. More desirably, the CO_2/N_2 max SF was increased by ～3 fold under wet conditions at ～50 ℃, a representative temperature of the flue gas stream. In fact, the presence of H_2O in the feed disfavored the permeation of N_2 more than that of CO_2 through CVD-modified CHA membranes and thus, contributed to the increased CO_2/ N_2 separation factor.
机译：孔径为0.37×0.42 nm〜2的菱沸石（CHA）沸石通过识别它们的微小尺寸差异，有望将CO_2（0.33 nm）与较大的N_2（0.364 nm）分离。此外，与基于CO_2亲和性的膜相反，CHA膜中的疏水性硅质成分可以在H_2O存在下保持CO_2 / N_2分离性能。为了增加分子筛的能力，通过二氧化硅前体（原硅酸四乙酯）的化学气相沉积（CVD）来减小所有二氧化硅CHA（Si-CHA）颗粒的孔径大小。因此，CVD处理持续时间的增加降低了CO 2进入CVD处理的Si-CHA颗粒的渗透率。此外，将CVD工艺应用于硅质CHA膜，以改善其CO_2 / N_2分离性能。与完整的CHA膜相比，在干燥条件下，经CVD处理的CHA膜的CO_2 / N_2最大分离系数（最大SF）增加了约2倍。更理想的是，在湿气条件下〜烟道气流的代表性温度〜50℃下，CO_2 / N_2 max SF增加〜3倍。实际上，进料中H_2O的存在比N_2的透过CVD修饰的CHA膜对CO_2的渗透更为不利，因此有助于增加CO_2 / N_2的分离系数。

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  • 来源
    《Environmental Science & Technology》 |2014年第24期|14828-14836|共9页
  • 作者

    Eunjoo Kim; Taehee Lee; Hyungmin Kim; Won-Jin Jung; Doug-Young Han; Hionsuck Baik; Nakwon Choi; Jungkyu Choi;

  • 作者单位

    Department of Chemical & Biological Engineering, College of Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-713, Republic of Korea;

    Department of Chemical & Biological Engineering, College of Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-713, Republic of Korea;

    Department of Chemical & Biological Engineering, College of Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-713, Republic of Korea;

    Center for Materials Analysis, Research Institute of Advanced Materials, Seoul National University, Gwanangno, Gwanak-gu, Seoul 151-744, Republic of Korea;

    Korea Basic Science Institute, Seoul Center, Anam-dong, Seongbuk-gu, Seoul 136-713, Republic of Korea;

    Korea Basic Science Institute, Seoul Center, Anam-dong, Seongbuk-gu, Seoul 136-713, Republic of Korea;

    Center for BioMicrosystems, Brain Science Institute, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea;

    Department of Chemical & Biological Engineering, College of Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-713, Republic of Korea,Green School, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-713, Republic of Korea;

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