Nickel–silicon intermetallics have been prepared
by a direct
silicification method using SiH4 as the silicon source.
The prepared nickel–silicon intermetallics were characterized
by X-ray diffraction, transmission electron microscopy, temperature-programmed
reduction, temperature-programmed desorption, X-ray photoelectron
spectroscopy, and CO chemisorption measurements. The catalytic hydrogenation
of cinnamaldehyde and phenylacetylene over the nickel–silicon
intermetallics was investigated. Nickel–silicon intermetallics
presented much higher selectivity to the intermediate product (hydrocinnamaldehyde)
than monometallic nickel catalyst, which may be attributed to the
repulsive force between the electronegative silicon atoms in the nickel–silicon
intermetallics and oxygen atoms in the CO bond of cinnamaldehyde.
In addition, nickel–silicon intermetallics showed excellent
selectivity for the hydrogenation of phenylacetylene to styrene (ca.
93%) due to the strong modification of the electronic structure derived
from the interaction of nickel and silicon.
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