15
• Posttreatment of the active phase structure in the case of gasoline HDS to increase
selectivity.
• CoMo- and NiMo-based HDT catalysts for diesel containing well-dispersed
active phase slabs with moderate MSI.
• Highly active and stable NiMo-based resid HDS catalysts through strong MSI.
In general, unsupported noble metal sulfide catalysts possess high catalytic activity compared to MoS 2 -based catalysts. However, Ni or Co promotion in MoS 2 and
dispersion on high surface area alumina makes it highly effective for HDT
NiMo-2.0
NiMo-1.0
2 Theta (q)
10
20
30
40
50
60
NiMo-0.5
Intensity (a.u.)
NiMo-0
NiMo-0.1
NiMo-0.2
Fig. 4 XRD patterns of the unsupported sulfided NiMo catalysts [24] (Reprinted from Catalysis
Today, 282, Huan Liu, Changlong Yin, Xuehui Li, Yongming Chai, Yanpeng Li, Chenguang Liu,
Effect of NiMo phases on the hydrodesulfurization activities of dibenzothiophene, 222–229, 2017,
with permission from Elsevier)
0.75
0.80
0.85
0.90
0.95
1.00
3.0
3.5
4.0
4.5
5.0
5.5
6.0
HDS activity of 4,6-DMDBT (mol/kg.h)
Slab length of (Ni)MoS 2 (nm)
Fig. 5 Effect of catalyst active phase design in terms of (Ni)MoS 2 slab length on HDS activity of
4,6-DMDBT [25] (Reprinted from Catalysis Today, 316, Hong Nie, Huifeng Li, Qinghe Yang,
Dadong Li, Effect of structure and stability of active phase on catalytic performance of hydrotreating catalysts, 13–20, 2018, with permission from Elsevier)
Recent Advances in Hydrotreating/Hydrodesulfurization Catalysts: Part I: Nature…