期刊
JOURNAL OF CATALYSIS
卷 384, 期 -, 页码 136-146出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2020.02.013
关键词
Dendritic composites; TS-1 nanocrystals; Dibenzothiophene; 4,6-Dimethyldibenzothiophene; Hydrodesulfurization
资金
- National Natural Science Foundation of China [21676298, 21878330, 21808079]
- CNPC Key Research Project [2016E-0707]
- Key Research and Development Program of Shandong Province [2019GSF109115]
- King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) [OSR-2019-CPF-4103.2]
A novel dendritic composite (TD) with an open center-radial pore structure using TS-1 nanocrystals as microporous precursors was successfully synthesized by a facile method. TS-1 nanocrystals were embedded into the framework of dendritic mesoporous silica nanospheres (DMSNs) to form Si-O-Ti bonds, which was beneficial for generating more S vacancies of MoS2 active phases. The NiMo/TD-2 catalyst had a larger surface area and stronger metal-support interaction, resulting in higher sulfidation and dispersion degrees of MoS2 active phases over the sulfided NiMo/TD-2 catalyst, which was consequently favored to improve the hydrodesulfurization (HDS) activity of dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT). Furthermore, the NiMo/TD-2 catalyst with an SiO2/TiO2 molar ratio of 150 exhibited higher HDS performance for DBT and 4,6-DMDBT than other NiMo/TD catalysts and the commercial NiMo/Al2O3 catalyst. Moreover, the NiMo/TD-2 catalyst possessed more Bronsted and Lewis acid sites, thus promoting the hydrogenation of DBT and the isomerization of 4,6-DMDBT. (C) 2020 Elsevier Inc. All rights reserved.
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