Synergistic effect of acidity and active phases on DBT
hydrodesulfurization performance: the role of S-edge and Mo-edge sites
Zhengkai Caoa,b, Xia Zhangb*, Rong
Guob, Chong, Pengb, Peng
Zhenga, Xilong Wanga, Jiyuan
Fana, Jinlin Meia, Chunming
Xua, Aijun Duana,*
a State Key Laboratory of Heavy Oil Processing, China
University of Petroleum, Beijing, 102249, P. R. China.
b Dalian Research Institute of Petroleum and
Petrochemicals, SINOPEC, Dalian 116041, Liaoning, China
* Corresponding authors: Aijun Duan, Xia Zhang
E-mail address:duanaijun@cup.edu.cn ;zhangxia.fshy@sinopec.com
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/kHYDcould be correlated.
Key words: acidity, active phase, HDS reaction, S-edge and
Mo-edge sites