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Effect of cyclohexanediamine tetraacetic acid on hydrodesulfurization performance of NiMo/Al2O3 catalyst
LI Yanpeng, ZHANG Tingting, LIU Dapeng, LIU Bin, CHAI Yongming, LIU Chenguang
(College of Chemical Engneering in China University of Petroleum(East China), Qingdao 266580, China)
Abstract:
The effect of cyclohexanediamine tetraacetic acid (CyDTA) on the hydrodesulfurization (HDS) performance of NiMo/Al2O3 catalyst was studied using dibenzothiophene (DBT) as model compound for HDS evaluation. The influence of molar ratio of Mo:CyDTA and heat treatment temperature on the HDS were investigated, and TEM and XPS were applied to interpret the promotion effect of CyDTA on NiMo catalyst. Evaluation results prove that the CyDTA could significantly increase the HDS activity as well as the direct-desulfurization selectivity of NiMo catalyst, and the molar ratio of Mo:CyDTA affects the most. The kHDS could be increased by 1.15 times with Mo∶CyDTA of 3∶2. The CyDTA could lead to a small increase of mean stacking number of MoS2 active phase, meanwhile the mean slab length is also increased thus the dispersion of MoS2 phase is declined. However the turnover frequency (TOF) of the active sites is substantially increased, which indicates that the nature of active phase might be changed. It is also found that there is interaction between CyDTA and Ni promotor, facilitating the synergy effect between Ni promoter and active MoS2 phase. Thus the concentration of active NiMoS phase could be promoted and finally the HDS performance of NiMo catalyst could be enhanced.
Key words:  hydrodesulfurization  NiMo catalysts  CyDTA  active phase