Fabrication of a NiFe Alloy Oxide Catalyst via Surface Reconstruction
Traditional NiFe alloy catalyst (NiFe AC) possesses low alcohol selectivity for the hydrodeoxygenation (HDO) of fatty acid due to its excessive deoxygenation into alkane. Herein, we innovatively provide the NiFe alloy oxide catalyst (NiFe AOC) to suppress the adsorption of aldehyde, which is the crucial intermediate of objective product alcohol converting into a side product, via the steric hindrance of lattice oxygen to inhibit the further conversion of alcohol. NiFe AOC reaches 100% conversion of lauric acid with 90% selectivity to lauryl alcohol. Kinetic analysis indicated that the apparent activation energy of side reaction increases by 71.1 kJ/mol for NiFe AOC relative to NiFe AC, evidencing the inhibition for the conversion of objective product alcohol into alkane for NiFe AOC. Furthermore, DFT calculation also suggests that the activation energy of the side reaction increases by 0.33 eV on NiFe AOC compared to NiFe AC. In addition, used NiFe AOC can be totally regenerated via surface reconstruction during the reduction–reoxidation treatment. However, overoxidation inducing NiFe surface phase separation weakened the synergistic interaction of Ni–Fe bimetallic sites and further decreased the catalytic activity.Get more news about Oxide Deoxidizing Catalyst,you can vist our website!
Element content of NiFe AC; effect of Bader charge of atoms in xO/NiFe; most stable configurations of different surfaces before adsorption; adsorption configurations of H on 4O/NiFe; initial state, transient state, and final state configurations of elementary steps in the decarbonylation of propyl alcohol; Raman spectra of used O400; conversion of lauric acid and product selectivity with NiFe AC; and conversion of lauryl alcohol used in the kinetic analysis (PDF)
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