Chinese Journal of Catalysis ›› 2017, Vol. 38 ›› Issue (3): 597-606.DOI: 10.1016/S1872-2067(17)62779-7

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Surfactant-assisted hydrothermally synthesized MoS2 samples with controllable morphologies and structures for anthracene hydrogenation

Min Lia,b,c, Donge Wangb, Jiahe Lib,c, Zhendong Panb, Huaijun Mab, Yuxia Jiangb,c, Zhijian Tianb,d, Anhui Lua   

  1. a State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China;
    b Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
    c University of Chinese Academy of Sciences, Beijing 100049, China;
    d State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, ChiZhendong nese Academy of Sciences, Dalian 116023, Liaoning, China
  • Received:2016-11-30 Revised:2016-12-30 Online:2017-03-18 Published:2017-03-22
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21303186) and the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA07020300).

Abstract:

MoS2 samples with controllable morphologies and structures were synthesized using surfactant-assisted hydrothermal processes. The effects of surfactants (PEG, PVP, P123, SDS, AOT, and CTAB) on the morphologies and structures of MoS2 samples were investigated. The results revealed that spherical, bulk-like, and flower-like MoS2 particles assembled by NH4+-intercalated MoS2 nano-sheets were synthesized. The morphologies of the MoS2 samples and their structures (including the slab length and the number of stacked layers) of MoS2 nano-sheets in these samples could be controlled by adjusting the surfactants. Mono-dispersed spherical MoS2 particles could be synthesized with PEG via the creation of MoS2 nano-sheets with slab lengths shorter than 15 nm and fewer than six stacked layers. Possible formation mechanisms of these MoS2 samples created via surfactant-assisted hydrothermal processes are proposed. Further, the catalytic activities of MoS2 samples for anthracene hydrogenation were evaluated in a slurry-bed reactor. The catalyst synthesized with the surfactant PEG exhibited the highest catalytic hydrogenation activity. Compared with the other catalysts, it had a smaller particle size, mono-dispersed spherical morphology, shorter slab length, and fewer stacked layers; these were all beneficial to exposing its active edges. This work provides an efficient approach to synthesize transition metal sulfides with controllable morphologies and structures.

Key words: Molybdenum sulfide, Surfactant-assisted, Controllable morphology, Mono-dispersed, Active edges, Anthracene hydrogenation