Hydrodeoxygenation of aliphatic acid over NiFe intermetallic compounds: Insights into the mechanism via model compound study

Han, Depeng; Wang, Yin; Luo, Dan; He, Han; Wang, Shengping

doi:10.1016/j.fuel.2021.121545

Cited by 14 publications

(24 citation statements)

References 81 publications

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“…Lauric acid was totally converted to alkanes through lauryl alcohol in 100 min with reduced Ni 3 Fe 1 /SiO 2 (NiFe AC) catalyst as shown in Figure S5. 36 However, with the effect of reaction time shown in Figure 6c, the selectivity to alkanes was only about 10% in 100 min, which indicated that the oxidation process of the Ni 3 Fe 1 /SiO 2 catalyst inhibited the deoxygenation of lauryl alcohol obviously. As the formation of undecane by decarbonylation was the main pathway to produce alkane, the inhibition effect mainly acted on this step.…”

Section: ■ Results and Discussionmentioning

confidence: 94%

“…Undecane and dodecane were the products of the decarbonylation and hydrodehydration of lauryl alcohol, respectively. Lauric acid was totally converted to alkanes through lauryl alcohol in 100 min with reduced Ni 3 Fe 1 /SiO 2 (NiFe AC) catalyst as shown in Figure S5 . However, with the effect of reaction time shown in Figure c, the selectivity to alkanes was only about 10% in 100 min, which indicated that the oxidation process of the Ni 3 Fe 1 /SiO 2 catalyst inhibited the deoxygenation of lauryl alcohol obviously.…”

Section: Resultsmentioning

confidence: 99%

“…According to the study on the reaction pathway of the HDO of fatty acid, , lauryl alcohol was the intermediate product in this process. Undecane and dodecane were the products of the decarbonylation and hydrodehydration of lauryl alcohol, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…According to our previous study on the HDO of fatty acid to produce alkanes, the catalyst would be oxidized after being used several times . But the oxidized catalysts resulted in a higher selectivity on the fatty alcohol.…”

Section: Introductionmentioning

confidence: 99%

“…According to our previous study on the HDO of fatty acid to produce alkanes, the catalyst would be oxidized after being used several times. 36 But the oxidized catalysts resulted in a higher selectivity on the fatty alcohol. Herein, the present work innovatively proposes a NiFe alloy oxide catalyst (NiFe AOC) prepared via the surface reconstruction during the oxidation treatment based on the NiFe alloy catalyst (NiFe AC).…”

Section: ■ Introductionmentioning

confidence: 99%

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Fabrication of a NiFe Alloy Oxide Catalyst via Surface Reconstruction for Selective Hydrodeoxygenation of Fatty Acid to Fatty Alcohol

Han

Wang

2021

ACS Sustainable Chem. Eng.

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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.

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Section: ■ Results and Discussionmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%