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Dispersed Ni and Co Promoted MoS 2 Catalysts with Magnetic Greigite as a Core: Performance and Stability in Hydrodesulfurization
Author(s) -
Sharifvaghefi Seyyedmajid,
Zheng Ying
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201700851
Subject(s) - hydrodesulfurization , dibenzothiophene , greigite , flue gas desulfurization , cobalt , chemical engineering , catalysis , chemistry , materials science , magnetite , inorganic chemistry , metallurgy , organic chemistry , engineering
Core‐shell composites MoS 2 /Fe 3 S 4 , CoMoS/Fe 3 S 4 , NiMoS/Fe 3 S 4 with greigite as the core were synthesized and compared to MoS 2 /Fe 3 O 4 for hydrodesulfurization (HDS). The composites with a greigite core were found to have higher hydrogenation (HYD) selectivity in HDS of dibenzothiophene (DBT) compared to the one with a magnetite core and showed higher stability during different cycles of DBT HDS test. Cobalt and Nickel as a promoter are uniformly dispersed over MoS 2 and decorated on the layer‐structured MoS 2 . NiMoS/Fe 3 S 4 showed the highest activity in the hydrodesulfurization of DBT and 4,6‐Dimethyldibenzothiophene (4,6‐DMDBT) followed by CoMoS/Fe 3 S 4 and MoS 2 /Fe 3 S 4 . For the promoted catalysts, the direct desulfurization (DDS) pathway was found to be more selectively enhanced than the HYD route in HDS of DBT. HYD pathway was the dominant route in HDS of 4,6‐dimethyldibenzothiophene (4,6‐DMDBT). Moreover, they have high stability, and the magnetic properties associated with these nano‐composites makes them an excellent choice for hydroprocessing of heavy petroleum oils in slurry reactors as they can be easily separated and reused.