Activity of DPU-Ni/D hydrogenation catalysts prepared by urea method
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Nickel catalysts supported on diatomite (Ni/D) were prepared by deposition-precipitation
urea (DPU) method. The precipitation of Ni(II) phase onto diatomite surface was
performed under various deposition-precipitation times. The catalyst precursors prepared
with different nickel loading were then subjected through preparation steps including
drying, reduction and passivation under the same conditions.
Characterization of textural, structural and reducible properties was carried out using
following techniques: N2-physisorption, Hg-porosimetry, XRD, IR, TG-DTG and TPR.
The activity of DPU-Ni/D catalysts was tested in the reaction of hydrogenation of soybean
oil. This reaction was performed in a three-phase slurry reactor, under conditions
described in our previous paper.
Figures 1 and 2 show the activities of the 1-U-Ni/D, 2-U-Ni/D and 3-U-Ni/D in catalytic test
reaction of soybean oil hydrogenation. For hydrogenation reaction the highest activity was
observed for the catalys...t sample 1-U-Ni/D with the lowest nickel loading. The activity of
catalyst samples increased in the following order: 1-U-Ni/D > 2-U-Ni/D > 3-U-Ni/D.
An observed trend of increasing activity with decrease of Ni loading is in good correlation
with the results obtained by the characterization of the catalyst surface and, in particular,
with reducible characteristics of prepared DPU-Ni/D catalyst samples.
Keywords:
Hydrogenation / Ni-based heterogeneous catalyst / urea method of synthesisSource:
Eight International Conference of the Chemical Societies of the South-East European Countries ICOSEC, 2013, 1, 71-Publisher:
- Serbian Chemical Society