Nickel incorporated mesostructured cellular
foam (NiMCF) was studied as a catalyst for palmitic acid deoxygenation to
primarily synthesize n-pentadecane and 1-pentadecene. The kinetic behaviour was
tested in a temperature range from 280 to 300°C.
The reaction was found to follow a first order
kinetic model with respect to the palmitic acid with an activation energy of
111.57 KJ/Mol. In the reusability study, it was found that the average reduction in palmitic acid conversions
was about 40.5%,
which indicated the occurrence of catalyst deactivation during the
deoxygenation. Fresh and spent catalysts were characterized by means of
scanning electron microscope.
Energy-dispersive X-ray spectroscopy and X-ray
powder diffraction correlate their characteristics with catalytic activity and
to identify the main catalyst deactivation mechanism. The catalyst deactivation
was mainly due to phase transformation of metallic nickel (Ni0) to nickel ion
(Ni2+) and the deposition of organic molecules on the catalyst during the
deoxygenation.
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