Fig. 4 (A) the correlation between S-edge and Mo-edge concentration and kHDS; (B) the correlation between fMoand kHDS; (C) the correlation between S-edge concentration and kDS; (D) the correlation between S-edge/Mo-edge ratio and kDDS/kHYDratio.
As reported, the dispersion degree of active phases, the concentration of S-edge and Mo-edge sites plays an important role in the HDS reaction.[7,21] The correlations between S-edge and Mo-edge concentration and kHDS, fMoand kHDS, S-edge concentration and kDSand S-edge/Mo-edge ratio and kDDS/kHYDratio are concluded in Fig. 4. Fig. 4A and Fig. 4B disclose that the higher MoS2 dispersion degree (fMo) and total concentration of S-edge and Mo-edge will allow a higher DBT HDS conversion. The correlation between kDS and S-edge concentration are presented in Fig. 4C. As mentioned before, the S-edge site can facilitate the selectivity of DDS route in DBT HDS reaction. Similarly, the result exhibits that the S-edge site can also facilitate the DS route of THDBT to CHB. From Fig. 4D, higher S-edge/Mo-edge ratio will indicate a higher kDDS/kHYD value, confirming that the S-edge/Mo-edge ratio could be well linked with the HDS selectivity.