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 Brønsted and Lewis acid sites, thus promoting the hydrogenation of DBT and the isomerization of 4,6-DMDBT.
|Original language||English (US)|
|Number of pages||11|
|Journal||Journal of Catalysis|
|State||Published - Mar 9 2020|
Bibliographical noteKAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was financially supported by the National Natural Science Foundation of China (Nos. 21676298, 21878330, and 21808079), a CNPC Key Research Project (2016E-0707), the Key Research and Development Program of Shandong Province (No. 2019GSF109115), and the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award OSR-2019-CPF-4103.2.