Paper
Journal of Materials Chemistry A
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4. Conclusion
In summary, pure FDU-12 silicas with spherical and inerratic
polyhedral morphologies were synthesized under static and
stirring conditions. Highly ordered mesoporous Ti-modied
FDU-12 composites with an Fm-3m structure were synthesized
through a simple two-step method of prehydrolysis of TEOS
followed by the addition of titanium butoxide as a titanium
source. Low angle XRD spectra and TEM results showed that
even when the Si : Ti ratio of the composites reaches 5, a rela-
tively ordered structure can still be obtained. N2-adsorption and
desorption measurement indicated their high surface areas,
and large pore volumes and sizes. XPS analysis of the sulded
catalysts showed that titanium incorporation facilitates the
dispersion of molybdena, and an appropriate Ti incorporation
make the formation of MoS2 and NiMoS phases easier. These
are very important for the HDS reaction. HDS tests of DBT and
4,6-DMDBT showed that all catalysts present high activities,
with the NiMo/ST-5 catalyst exhibiting the highest HDS effi-
ciency due to its relatively ordered structure, high surface area
and the incorporation of TiO2.
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Acknowledgements
The authors acknowledge nancial support from the National
NSFC (no. 21276277), the Opening Project of the Guangxi Key
Laboratory of Petrochemical Source Processing and Process
Intensication Technology (2012K01), the CNPC-Petrochemical
Research Key project, and the PetroChina Innovation Founda-
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