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高等学校化学研究 ›› 2020, Vol. 36 ›› Issue (5): 946-954.doi: 10.1007/s40242-020-0024-3

• Articles • 上一篇    下一篇

Highly Uniform Alkali Doped Cobalt Oxide Derived from Anionic Metal-Organic Framework: Improving Activity and Water Tolerance for CO Oxidation

LEI Huijin, ZHANG Xinlu, JIN Jiongke, WANG Shuhua, DING Shunmin, ZHANG Ning, CHEN Chao   

  1. Key Laboratory of Jiangxi Province for Environment and Energy Catalysis, College of Chemistry, Nanchang 330031, P. R. China
  • 收稿日期:2020-02-04 修回日期:2020-03-13 出版日期:2020-10-01 发布日期:2020-10-01
  • 通讯作者: CHEN Chao, DING Shunmin E-mail:chaochen@ncu.edu.cn;Sding@ncu.edu.cn
  • 基金资助:
    Supported by the National Natural Science Foundation of China(Nos.21661020, 21961021).

Highly Uniform Alkali Doped Cobalt Oxide Derived from Anionic Metal-Organic Framework: Improving Activity and Water Tolerance for CO Oxidation

LEI Huijin, ZHANG Xinlu, JIN Jiongke, WANG Shuhua, DING Shunmin, ZHANG Ning, CHEN Chao   

  1. Key Laboratory of Jiangxi Province for Environment and Energy Catalysis, College of Chemistry, Nanchang 330031, P. R. China
  • Received:2020-02-04 Revised:2020-03-13 Online:2020-10-01 Published:2020-10-01
  • Contact: CHEN Chao, DING Shunmin E-mail:chaochen@ncu.edu.cn;Sding@ncu.edu.cn
  • Supported by:
    Supported by the National Natural Science Foundation of China(Nos.21661020, 21961021).

摘要: A sequence of alkali metal cation-exchanged Co metal-organic frameworks(Co-MOFs), therein after denoted as M@Co-MOF, M=Na+, K+, Rb+, and Cs+, was prepared and used as the precursors to obtain the corresponding alkali doped cobalt oxide(defined as M/Co3O4, M=Na+, K+, Rb+, and Cs+) through calcination under air atmosphere. The cobalt oxide modified by uniform alkali metals exhibited a significant promotion of catalytic activity for CO oxidation. The activity of M/Co3O4 decreased in the order of Cs+ > Na+ > K+ > Rb+. Experimental and theoretical results revealed that the anionic skeleton of Co-MOF could facilely adsorb alkali metal cations and play a crucial role in the formation of highly uniform alkali doped cobalt oxide. The further characterizations, such as temperature-programmed reduction of H2(H2-TPR), oxygen temperature-programmed desorption(O2-TPD), X-ray photoelectron spectroscopy(XPS), and in situ diffuse reflectance infrared Fourier transform(DRIFT) spectra demonstrated that the enhanced catalytic activity is originated from the interfacial electron transfer as well as weakened the Co-O bond strength, which promoted oxygen desorption from Co3O4 and formation of cobalt species with the lower valence state. The Cs/Co3O4 catalyst was maintained for 60 h without deactivation and still showed a high activity in the presence of water.

关键词: Anionic framework, Alkali metal, CO oxidation, M/Co3O4, Metal-organic framework precursor

Abstract: A sequence of alkali metal cation-exchanged Co metal-organic frameworks(Co-MOFs), therein after denoted as M@Co-MOF, M=Na+, K+, Rb+, and Cs+, was prepared and used as the precursors to obtain the corresponding alkali doped cobalt oxide(defined as M/Co3O4, M=Na+, K+, Rb+, and Cs+) through calcination under air atmosphere. The cobalt oxide modified by uniform alkali metals exhibited a significant promotion of catalytic activity for CO oxidation. The activity of M/Co3O4 decreased in the order of Cs+ > Na+ > K+ > Rb+. Experimental and theoretical results revealed that the anionic skeleton of Co-MOF could facilely adsorb alkali metal cations and play a crucial role in the formation of highly uniform alkali doped cobalt oxide. The further characterizations, such as temperature-programmed reduction of H2(H2-TPR), oxygen temperature-programmed desorption(O2-TPD), X-ray photoelectron spectroscopy(XPS), and in situ diffuse reflectance infrared Fourier transform(DRIFT) spectra demonstrated that the enhanced catalytic activity is originated from the interfacial electron transfer as well as weakened the Co-O bond strength, which promoted oxygen desorption from Co3O4 and formation of cobalt species with the lower valence state. The Cs/Co3O4 catalyst was maintained for 60 h without deactivation and still showed a high activity in the presence of water.

Key words: Anionic framework, Alkali metal, CO oxidation, M/Co3O4, Metal-organic framework precursor