Highly active and stable MoWS2 catalysts in slurry phase hydrocracking of vacuum residue
2020
Jeong, Hyun-Rok | Kim, Ki-Duk | Yi, Yong-gŏl
Dispersed MoₓW₍₁₋ₓ₎S₂ catalysts were obtained in situ in the hydrocracking (HCK) of vacuum residue (VR) at 693 K at 9.5 MPa H₂ with the same metal loading of 0.113 mmol with varying Mo:W ratios. The intrinsic activities of the catalysts were compared based on the H₂ consumption rate per the surface site number, i.e. TOFₛ. The Mo₀.₇₅W₀.₂₅S₂ catalyst showed a superior activity with a high TOFₛ of 0.6012 s⁻¹ over those of monometallic sulfides of MoS₂ (0.4764 s⁻¹) or WS₂ (0.2550 s⁻¹). Transmission electron microscopy (TEM) analysis identified that the morphology and average particle size of the MoWS₂ catalyst maintains even after three times of recycles. Moreover, extended X-ray absorption fine structure (EXAFS) analysis confirmed homogeneous distribution of Mo and W species in the MoWS₂ phase.
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