化工学报 ›› 2015, Vol. 66 ›› Issue (11): 4469-4475.DOI: 10.11949/j.issn.0438-1157.20150504

• 分离工程 • 上一篇    下一篇

CO/N2/CO2在MOF-74(Ni)上吸附相平衡和选择性

刘有毅, 黄艳, 何嘉杰, 肖静, 夏启斌, 李忠   

  1. 华南理工大学化学与化工学院, 广东 广州 510640
  • 收稿日期:2015-04-21 修回日期:2015-06-09 出版日期:2015-11-05 发布日期:2015-11-05
  • 通讯作者: 黄艳
  • 基金资助:

    国家自然科学基金项目(21176085);云南中烟工业有限责任公司科技项目基金资助项目(2012FL03)。

Adsorption isotherms and selectivity of CO/N2/CO2 on MOF-74(Ni)

LIU Youyi, HUANG Yan, HE Jiajie, XIAO Jing, XIA Qibin, LI Zhong   

  1. School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
  • Received:2015-04-21 Revised:2015-06-09 Online:2015-11-05 Published:2015-11-05
  • Supported by:

    supported by the National Natural Science Foundation of China (21176085) and the Science and Technology Foundation Project of China Tobacco Yunnan Industrial Co. LTD (2012FL03).

摘要:

主要研究了MOF-74(Ni)材料对CO/N2/CO2的吸附分离性能。应用水热法合成制备MOF-74(Ni),分别采用全自动表面积吸附仪、P-XRD、扫描电子显微镜对材料的孔隙结构和晶体形貌进行了表征,应用静态吸附法测定了CO、N2和CO2在MOF-74(Ni)上的吸附等温线,应用DSLF方程模拟了3种气体MOF-74(Ni)上的吸附等温线,依据IAST理论模型计算了MOF-74(Ni)对CO/N2二元混合物和CO/CO2二元混合物的吸附选择性。研究结果表明:在0.1 MPa和常温条件下,MOF-74(Ni)材料对CO吸附容量高达6.15 mmol·g-1,而相同条件下N2的吸附量只有0.86 mmol·g-1。MOF-74(Ni)在低压下(0~40 kPa)对CO的吸附量明显高于其对CO2的吸附量。应用IAST模型估算MOF-74(Ni)对二元混合物吸附选择性的结果表明:MOF-74(Ni)对CO/N2混合物的吸附选择性在1000以上;MOF-74(Ni)对CO/CO2的吸附选择性在4~9范围,在所研究的二元气体混合物吸附体系中,MOF-74(Ni)都能优先吸附CO。

关键词: MOF-74(Ni), 吸附, 一氧化碳, 吸附选择性, 二元混合物

Abstract:

This work investigates the adsorption performance of adsorbent MOF-74(Ni) for CO/N2 and CO2/CO2 binary gas mixtures. Adsorbent MOF-74(Ni) with high density of coordinatively unsaturated sites was synthesized by a hydrothermal method, and characterized with N2 adsorption, P-XRD, and SEM. The adsorption isotherms of CO, N2 and CO2 on MOF-74(Ni) were measured, and the selectivities for CO/N2 and CO/CO2 were calculated based on ideal adsorbed solution theory (IAST). Results showed that adsorbent MOF-74(Ni) achieved superior CO adsorption capacity of 6.15 mmol·g-1 at 298 K and 0.1 MPa, and as low as 0.86 mmol·g-1 for N2. In low pressure range of 0—40 kPa, MOF-74(Ni) showed significantly higher uptake for CO than that for CO2. Moreover, IAST-predicted CO/N2 selectivity of MOF-74(Ni) is above 1000, and its CO/CO2 selectivity is in the range of 4—9. It suggests that MOF-74(Ni) is more favorable for CO adsorption than N2 and CO2 adsorption.

Key words: MOF-74(Ni), adsorption, carbon monoxide, adsorption selectivity, binary mixture

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