ZSM-5/SBA-16
(ZS) composite materials with different morphologies
were synthesized successfully. The series supports were utilized to
prepare NiMo/ZS for dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene
(4,6-DMDBT) hydrodesulfurization (HDS) reactions. Series ZS supports
and NiMo/ZS were well characterized to investigate their structure–property
relationship. The NiMo/ZS catalyst (NiMo/ZS-3) with uniform morphology
and well-ordered pore channels showed the maximum k
HDS and TOF values of DBT and 4,6-DMDBT HDS. The k
HDS value (13.9 × 10–4 mol g–1 h–1) of DBT over NiMo/ZS-3
was more than 2 times greater than that over the reference NiMo/ZS-M
catalyst (5.5 × 10–4 mol g–1 h–1), 3 times greater than that over the NiMo/SBA-16
catalyst (4.4 × 10–4 mol g–1 h–1), and almost 4 times greater than that over
the NiMo/ZSM-5 catalyst (3.5 × 10–4 mol g–1 h–1). Furthermore, the k
HDS value (8.4 × 10–4 mol g–1 h–1) of 4,6-DMDBT over
NiMo/ZS-3 was more than 3 times greater than that over the reference
NiMo/ZS-M catalyst (2.8 × 10–4 mol g–1 h–1), more than 4 times greater than that over
the NiMo/SBA-16 catalyst (1.7 × 10–4 mol g–1 h–1), and almost 5 times greater
than that over the NiMo/ZSM-5 catalyst (1.6 × 10–4 mol g–1 h–1). The superior DBT
and 4,6-DMDBT HDS performances were assigned to the uniform morphology,
well-ordered pore channels, and high B/L ratio of the NiMo/ZS-3 catalyst
and the suitable dispersion of the MoS2 active phases.
HYD was the preferential route for DBT HDS, while ISO was the preferential
route for 4,6-DMDBT HDS because of the high B/L ratio of NiMo/ZS-3.
Moreover, the DBT and 4,6-DMDBT HDS reaction networks of the series
NiMo/ZS are presented.
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