高等学校化学学报 ›› 2021, Vol. 42 ›› Issue (5): 1589.doi: 10.7503/cjcu20200303

• 研究论文 • 上一篇    下一篇

原位限域生长策略制备有序介孔碳负载的超小MoO3纳米颗粒

王常耀,王帅,段林林,朱晓航,张兴淼,李伟   

  1. 复旦大学化学系, 上海 200433
  • 收稿日期:2020-05-28 出版日期:2021-05-10 发布日期:2020-09-24
  • 基金资助:
    国家自然科学基金(21975050);国家重点研发计划纳米科技重点专项(2016YFA0204000);中国博士后科学基金(2019M651342)

In situ Confinement Growth Strategy for Ordered Mesoporous Carbon Support Ultrasmall MoO3 Nanoparticles

WANG Changyao, WANG Shuai, DUAN Linlin, ZHU Xiaohang, ZHANG Xingmiao, LI Wei()   

  1. Department of Chemistry,Fudan University,Shanghai 200433,China
  • Received:2020-05-28 Online:2021-05-10 Published:2020-09-24
  • Contact: LI Wei E-mail:weilichem@fudan.edu.cn
  • Supported by:
    This paper is supported by the National Natural Science Foundation of China(21975050);the Natio?nal Key Research and Development Program of China(2016YFA0204000);China Postdoctoral Science Foundation(2019M651342)

摘要:

采用原位限域生长策略制备了一系列有序介孔碳负载的超小MoO3纳米颗粒复合物(OMC-US-MoO3). 其中, 有序介孔碳被用作基质来原位限域MoO3纳米晶的生长. 依此方法制备的MoO3纳米晶具有超小的晶粒尺寸(<5 nm), 并在介孔碳骨架内具有良好的分散度. 制得的OMC-US-MoO3复合物具有可调的比表面积(428~796 m2/g)、 孔容(0.27~0.62 cm3/g)、 MoO3质量分数(4%~27%)和孔径(4.6~5.7 nm). 当MoO3纳米晶的质量分数为7%时, 所得样品OMC-US-MoO3-7具有最大的孔径、 最小的孔壁厚度和最规整的介观结构. 该样品作为催化剂时, 表现出优异的环辛烯选择性氧化性能.

关键词: 有序介孔碳, 氧化钼纳米晶, 纳米材料, 限域生长

Abstract:

Ultrasmall particle sizes and excellent dispersity of the MoO3 active species on support majorly dominate their catalytic performances. Herein, a series of ordered mesoporous carbon support ultrasmall molybdena nanoparticles(OMC-US-MoO3) composites was synthesized through an in situ confinement growth strategy. Ordered mesoporous carbon was used as the matrix to in situ confine the growth of MoO3 nanocrystals. The obtained MoO3 nanocrystals show ultrasmall particle sizes(<5 nm) and excellent dispersity on the meso- porous carbon frameworks. The obtained OMC-US-MoO3 exhibits tunable specific surface areas(428―796 m2/g), pore volumes(0.27―0.62 cm3/g), MoO3 contents(4%―27%, mass fraction) and uniform pore sizes(4.6―5.7 nm). As a typical example, the obtained sample with 7% MoO3(denoted as OMC-US-MoO3-7) shows the largest pore size, smallest thickness of pore wall and most regular mesostructures. When being used as a catalyst, the OMC-US-MoO3-7 exhibits an excellent catalytic activity for selective oxidation of cyclooctene with a high stability.

Key words: Ordered mesoporous carbon, MoO3 nanocrystal, Nanomaterials, Confinement growth

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