SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2022, Vol. 41 ›› Issue (1): 420-429.DOI: 10.1016/j.cjche.2021.10.004

• Catalysis, Kinetics and Reaction Engineering • 上一篇    下一篇

The self-assembly of gold nanoparticles in large-pore ordered mesoporous carbons

Chun Pei, Shangjun Chen, Rongrong Song, Fei Lv, Ying Wan   

  1. Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, and Department of Chemistry, Shanghai Normal University, Shanghai 200234, China
  • 收稿日期:2021-06-12 修回日期:2021-09-11 出版日期:2022-01-28 发布日期:2022-02-25
  • 通讯作者: Shangjun Chen,E-mail address:jshchen@shnu.edu.cn;Ying Wan,E-mail address:ywan@shnu.edu.cn
  • 基金资助:
    This work was supported by the National Natural Science Foundation of China (22025204, 92034301, 21773156, and 51932005), the Shanghai Sci. & Tech. and Edu. Committee (19070502700), and the Innovation Program of the Shanghai Municipal Education Commission (2021-01-07-00-02-E00119).

The self-assembly of gold nanoparticles in large-pore ordered mesoporous carbons

Chun Pei, Shangjun Chen, Rongrong Song, Fei Lv, Ying Wan   

  1. Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, and Department of Chemistry, Shanghai Normal University, Shanghai 200234, China
  • Received:2021-06-12 Revised:2021-09-11 Online:2022-01-28 Published:2022-02-25
  • Contact: Shangjun Chen,E-mail address:jshchen@shnu.edu.cn;Ying Wan,E-mail address:ywan@shnu.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (22025204, 92034301, 21773156, and 51932005), the Shanghai Sci. & Tech. and Edu. Committee (19070502700), and the Innovation Program of the Shanghai Municipal Education Commission (2021-01-07-00-02-E00119).

摘要: Simple encapsulation of 3 nm gold nanoparticles in ordered mesoporous carbon with large pores of 17 nm and thick pore walls of 16 nm was achieved by a metal–ligand coordination assisted-self-assembly approach. Polystyrene-block-polyethylene-oxide (PS-b-PEO) diblock copolymer with a large molecular weight of the PS chain and mercaptopropyltrimethoxysilane were used as the template and the metal ligand, respectively. Small-angle X-ray scattering, X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy showed that monodispersed aggregation-free gold nanoparticles approximately 3 nm in size were partially embedded in the large open pore structure of the ordered mesoporous carbon. The strong coordination between the gold species and the mercapto groups and the thick porous walls increased the dispersion of the gold nanoparticles and essentially inhibited particle aggregation at 600 ℃. The gold nanoparticles in the ordered mesoporous carbon are active and stable in the reduction of nitroarenes involving bulky molecules using sodium borohydride as a reducing agent under ambient conditions (30 ℃) in water. The large interconnected pore structure facilitates the mass transfer of bulky molecules.

关键词: Gold catalyst, Ordered mesoporous carbon, Large pores, Reduction, Nitroarenes

Abstract: Simple encapsulation of 3 nm gold nanoparticles in ordered mesoporous carbon with large pores of 17 nm and thick pore walls of 16 nm was achieved by a metal–ligand coordination assisted-self-assembly approach. Polystyrene-block-polyethylene-oxide (PS-b-PEO) diblock copolymer with a large molecular weight of the PS chain and mercaptopropyltrimethoxysilane were used as the template and the metal ligand, respectively. Small-angle X-ray scattering, X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy showed that monodispersed aggregation-free gold nanoparticles approximately 3 nm in size were partially embedded in the large open pore structure of the ordered mesoporous carbon. The strong coordination between the gold species and the mercapto groups and the thick porous walls increased the dispersion of the gold nanoparticles and essentially inhibited particle aggregation at 600 ℃. The gold nanoparticles in the ordered mesoporous carbon are active and stable in the reduction of nitroarenes involving bulky molecules using sodium borohydride as a reducing agent under ambient conditions (30 ℃) in water. The large interconnected pore structure facilitates the mass transfer of bulky molecules.

Key words: Gold catalyst, Ordered mesoporous carbon, Large pores, Reduction, Nitroarenes