应用化学 ›› 2023, Vol. 40 ›› Issue (6): 896-903.DOI: 10.19894/j.issn.1000-0518.220341

• 研究论文 • 上一篇    下一篇

蒸气辅助合成PCN-6(M)双金属有机框架材料及其CH4和CO2吸附性能

元宁1, 马洁1, 张晋玲1, 张建胜1,2()   

  1. 1.清华大学山西清洁能源研究院,太原 030032
    2.清华大学能源与动力工程系,北京 100084
  • 收稿日期:2022-10-20 接受日期:2023-03-09 出版日期:2023-06-01 发布日期:2023-06-27
  • 通讯作者: 张建胜

Preparation of PCN-6(M) Bimetallic Organic Framework Materials by Steam-assisted Method and Their CO2 and CH4 Adsorption Performance

Ning YUAN1, Jie MA1, Jin-Ling ZHANG1, Jian-Sheng ZHANG1,2()   

  1. 1.Shanxi Research Institute for Clean Energy,Tsinghua University,Taiyuan 030032,China
    2.Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China
  • Received:2022-10-20 Accepted:2023-03-09 Published:2023-06-01 Online:2023-06-27
  • Contact: Jian-Sheng ZHANG
  • About author:zhang-jsh@tsinghua.edu.cn

摘要:

以PCN-6(Cu3TATB2)为母体材料,Co、Fe、Mn、Zn和Ni为第2种金属,将蒸气辅助法应用于双金属有机框架材料(MOFs)的合成中,并成功制备出PCN-6(M)(M=Co/Fe/Mn/Zn/Ni)系列双金属材料,采用粉末X射线衍射仪(PXRD)、扫描电子显微镜(SEM)、能谱仪(EDS)、电感耦合等离子发射光谱仪(ICP-OES)和气体吸附等技术手段对合成的材料进行了结构、形貌、组成和性能的表征,结果表明制备的PCN-6(M)系列双金属材料的PXRD衍射峰和形貌与母体材料PCN-6一致,交换的金属在材料中分布均匀,交换量(质量分数)分别为Co:12.1%,Fe:22.0%,Mn:16.1%,Zn:17.5%,Ni:16.8%,远高于相同条件下溶剂热法的金属交换量(5%左右),在气体吸附性能方面,PCN-6(Zn)、PCN-6(Ni)和PCN-6(Co)这3种双金属材料对CH4和CO2的吸附能力优于母体材料,理想吸附溶液理论(IAST)计算表明,PCN-6(Fe)对CO2/CH4的吸附选择性优于母体材料。通过蒸气辅助法制备双金属MOFs材料,可以提高金属的交换量并改变MOFs材料对不同气体分子的亲合力,进而提高材料对气体的吸附性能和选择性。蒸气辅助法为双金属MOFs材料的制备提供了新的思路,且有望用应于其它材料的制备中。

关键词: 气体吸附, CO2/CH4分离, 蒸气辅助法, 双金属有机框架材料

Abstract:

In this work, a steam-assisted method is used to prepare bimetallic organic framework materials (bimetallic MOFs). Co, Fe, Mn, Zn, and Ni as the secondary metals are exchanged in the structure of PCN-6 which has large specific surface area and high porosity, and a series of PCN-6(M) (M=Co/Fe/Mn/Zn/Ni) bimetallic materials are obtained. Their structure, morphology, composition, and adsorption properties are characterized by powder X-ray diffraction(PXRD), scanning electron microscopy(SEM), energy dispersive spectroscopy(EDS), inductively coupled plasma-atomic emission spectroscopy(ICP-OES), and gas adsorption methods. The results show that the diffraction peaks and morphology of the PCN-6(M) series bimetallic materials are consistent with the parent material PCN-6, and the exchanged metals content reaches 12.1% for Co, 22.0% for Fe, 16.1% for Mn, 17.5% for Zn, and 16.8% for Ni, respectively,which is much higher than the metal exchange capacity of solvothermal method (about 5.0%) under the same conditions. In terms of gas adsorption performance, PCN-6(Zn), PCN-6(Ni) and PCN-6(Co) have better adsorption capacity for CH4 and CO2 than the parent material, especially at low pressure. In addition, the adsorption selectivity of V(CO2)∶V(CH4)=50∶50, PCN-6(Fe) is superior to the parent material by theoretical ideal adsorption solution theory (IAST) calculation. The preparation of bimetallic MOFs by steam-assisted method can improve the exchange capacity of metals and change the affinity of MOFs to different gas molecules, thereby improving the gas adsorption performance and selectivity of materials. The steam-assisted method provides a new idea for the preparation of bimetallic MOFs, which is expected to be used in the preparation of other materials.

Key words: Gas adsorption, CO2/CH4 separation, Steam-assisted method, Bimetallic organic framework materials

中图分类号: