Size Effects
of Pt Nanoparticles Supported on Carbon
Nanotubes for Selective Oxidation of Glycerol in a Base-Free Condition
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Abstract
Different sized Pt nanoparticles
supported on carbon nanotubes
were prepared and then applied in selective oxidation of glycerol
in a base-free condition to understand the size effects. It is shown
that the turnover frequency of glycerol increases with Pt particle
size to a maximum at the mean size of 2.5 nm followed by a decline
with a further increase in size, which may be due to strongly adsorbed
intermediates blocking Pt active sites for smaller sized Pt catalyst.
Moreover, compared with dihydroxyacetone, glyceraldehyde and subsequent
glyceric acid (GLYA) are dominating products. In particular, smaller
sized Pt catalyst favors the formation of GLYA, which could be related
to the stronger oxidation. Unexpectedly, the selectivity of C3 products
is insensitive to both Pt particle size and reaction time within 9
h