J. Kibsgaard et al. / Journal of Catalysis 263 (2009) 98–103
103
oxides by chemical linkages at the particle edges. In future exper-
iments it would be interesting to synthesize MoS2 nanoparticles
on another facet of rutile TiO2 or the anatase polymorph of TiO2,
which will have a different lattice mismatch with respect to the
MoS2 lattice, to investigate whether the width of the synthesized
MoS2 nanoparticles is changed accordingly as expected from the
present results. Finally, it would be highly interesting to include
both the effect of promoter atoms and the effect of the support.
Activity measurements have shown that the HDS activity of thio-
phene for the same Mo loading is promoted by Co by a factor of 7.6
on alumina, but only by a factor of 3.3 on titania [18]. This find-
ing clearly suggests that the support does not only play a passive
role, but there is a synergy between the effects of support and
the effects of the promoter atoms. The difference in promotion
has recently been proposed to be due to different edge wetting
effects for MoS2 and CoMoS particles on titania and alumina [39],
and future STM or Atomic Force Microscopy (AFM) experiments on
promoted TiO2-supported or Al2O3-supported MoS2 nanoparticles
may provide detailed information on this interesting synergy ef-
fect.
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The iNANO group gratefully acknowledges financial support
from The Danish Research Councils and The Strategic Research
Council (NABIIT project “Development of new metal-oxide and
-sulphide catalysts”). J.V.L. furthermore acknowledges financial
support from Haldor Topsøe A/S, the Carlsberg Foundation and the
Lundbeck Foundation. Discussions with K.G. Knudsen and B. Hin-
nemann are also gratefully acknowledged.
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