化工学报 ›› 2013, Vol. 64 ›› Issue (2): 616-623.DOI: 10.3969/j.issn.0438-1157.2013.02.028

• 分离工程 • 上一篇    下一篇

氨基改性层状双氢氧化物的制备及其二氧化碳吸附机理

艾宁1,2, 姜哲1, 徐茜3, 钱琪枫3, 伍希1, 王家炜3   

  1. 1. 浙江工业大学化学工程与材料学院,浙江 杭州 310032;
    2. 清华大学,化学工程联合国家重点实验室,北京 100084;
    3. 宁波诺丁汉大学工程学院,浙江 宁波 315100
  • 收稿日期:2012-07-31 修回日期:2012-10-10 出版日期:2013-02-05 发布日期:2013-02-05
  • 通讯作者: 王家炜
  • 作者简介:艾宁(1977—),男,博士,副教授。
  • 基金资助:

    化学工程联合国家重点实验室开放课题项目(SKL-ChE-11A02)。

Preparation of amine modified layered double hydroxide and its adsorption mechanism for CO2

AI Ning1,2, JIANG Zhe1, XU Qian3, QIAN Qifeng3, WU Xi1, WANG Jiawei3   

  1. 1. College of Chemical Engineering and Material Science, Zhejiang University of Technology, Hangzhou 310032, Zhejiang, China;
    2. State Key Laboratory of Chemical Engineering, Tsinghua University, Beijing 100084, China;
    3. Division of Engineering, University of Nottingham Ningbo China, Ningbo 315100, Zhejiang, China
  • Received:2012-07-31 Revised:2012-10-10 Online:2013-02-05 Published:2013-02-05
  • Supported by:

    supported by the State Key Laboratory of Chemical Engineering in Tsinghua University, China(SKL-ChE-11A02).

摘要: 以氨基硅烷为改性剂,采用超声剥脱的方法合成了氨基改性的层状双氢氧化物。利用元素分析、X射线衍射(XRD)、漫反射红外傅里叶变换光谱(DRIFTS)和热重分析(TGA)等技术对样品进行了表征。研究了样品在25~150℃温度范围内的二氧化碳吸附能力。在80℃下,NiMgAl N2在纯CO2和15% CO2/N2混合气中达到最大吸附容量,分别为2.02 mmol·g-1和1.89 mmol·g-1。吸附/脱附再生实验显示140℃为最佳的脱附温度。利用原位漫反射傅里叶红外光谱对二氧化碳在样品上的吸附进行了机理研究。

关键词: 二氧化碳, 吸附, 原位红外光谱, 层状双氢氧化物, 氨基

Abstract: An amine modified NiMgAl layered double hydroxide was synthesized via an exfoliation and grafting method.The samples were characterized by elemental analysis, X-ray diffraction, diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), and thermogravimetric analysis (TGA).Adsorption of carbon dioxide on the modified layered double hydroxide was investigated by TGA at 25—150℃.NiMgAl N2 shows a maximum CO2 adsorption capacity of 2.02 mmol·g-1 in pure CO2 and 1.89 mmol·g-1 in 15% CO2/N2 at 80℃.The optimum desorption temperature is 140℃ for NiMgAl N2 according to adsorption/desorption experiments.By in-situ DRIFTS, the adsorption of CO2 on NiMgAl N2 follows the mechanism of formation of ammonium carbamate ion pairs.

Key words: carbon dioxide, adsorption, in-situ infrared spectrometer, layered double hydroxide, amine

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