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Synergistic effect of acidity and active phases on DBT HDS performance: the role of S-edge and Mo-edge sites
  • +7
  • Zhengkai Cao,
  • Xia Zhang,
  • Rong Guo,
  • Chong Peng,
  • Peng Zheng,
  • Xilong Wang,
  • Jiyuan Fan,
  • Jinlin Mei,
  • Chunming Xu,
  • aijun duan
Zhengkai Cao
China University of Petroleum Beijing
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Xia Zhang
Fushun Research Institute of Petroleum and Petrochemicals
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Rong Guo
Fushun Research Institute of Petroleum and Petrochemicals
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Chong Peng
East China University of Science and Technology
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Peng Zheng
China University of Petroleum Beijing
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Xilong Wang
China University of Petroleum Beijing College of Chemical Engineering
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Jiyuan Fan
China University of Petroleum Beijing
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Jinlin Mei
China University of Petroleum Beijing
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Chunming Xu
Chinese University of Petroleum
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aijun duan
China University of Petroleum, Beijing
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Abstract

Dual-metal modifications on SBA-16 silica were implemented to modulate the acidities and the distribution and dispersion of active phases for NiMo catalysts. The results showed that the acidity of S-H groups in S-edge sites can be promoted by B acid and further facilitate the DDS selectivity. The NiMo/AT-7.5 catalyst exhibits the highest HDS efficiency of 97.5% due to its appropriate acidity, highest proportion of MoS2 phase and concentration of S-edge sites. The kinetic and thermodynamic analyses were applied to investigate the intrinsic HDS reactivity for various catalysts. The results confirmed the existence of synergistic effect in the DBT HDS reaction. The B acid sites can further increase the desulfurization route (DS) of THDBT to CHB. A higher dispersion degree of MoS2 could improve DBT HDS efficiency. A high total concentration of S-edge and Mo-edge will indicate a high HDS efficiency. The S-edge/Mo-edge ratio and kDDS/kHYD could be correlated.