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