Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 317, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2022.121801
Keywords
Tetradecylamine; Assembly; NiMoS/Al2O3; 4,6-DMDBT hydrodesulfurization
Funding
- National Natural Science Foundation of China [21978323, 22108145]
- Shandong Province Natural Science Foundation [ZR2020QB189]
- Talent Foundation - Ministry Co-construction Collaborative Innovation Center of Ecochemical Engineering [STHGYX2201]
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Novel alumina-supported Ni-Mo catalysts for hydrodesulfurization were prepared via assembly method induced by tetradecylamine, which improved Mo dispersion and Ni modification, and promoted the formation of NiMoS phases.
Novel alumina-supported Ni-Mo hydrodesulfurization (HDS) catalysts were prepared via assembly of Mo and Al precursors induced by tetradecylamine (TDA). Compared with conventional impregnation, this assembly method improves Mo dispersion, weakens metal-support interactions, enhances Ni modification at MoS2 edge sites, and produces more NiMoS phases on Al2O3. The optimal NiMoS microstructure was obtained by modulating the TDA/Mo ratio in the assembly. A microstructure-activity correlation indicated that the S vacancies at the NiMoS corner sites favored sigma-adsorption and direct desulfurization of 4,6-dimethylbenzothiophene (4,6-DMDBT), and those at the NiMoS edge sites promoted C-S breaking in hydrogenated derivatives of 4,6-DMDBT. Among these catalysts, NiTMo-2.0/Al2O3, which had the most corner and edge S vacancies, exhibited the highest reaction rate constant of 5.89 x 10(-7) mol center dot g(-1)center dot s(-1) and the highest desulfurization ratio of 99.5% in HDS of 4,6-DMDBT.
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