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ACS Applied Materials & Interfaces

ACS Applied Materials & Interfaces

IF: 8.3
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Revealing the Effects of Mo Doping to Ni on Catalyzing Hydrogenation of Fatty Acids to Fatty Alcohols

Published:12 December 2024 DOI: 10.1021/acsami.4c13926
Xiaonan Xu, Nana Luo, Wan-Hui Wang, Ming Bao, Jiasheng Wang

Abstract

Fatty acid hydrogenation is an important method for the production of fatty alcohols. The combination of Ni and Mo has been reported to be an effective and low-cost catalyst. However, the effect of Mo doping has yet to be fully understood. Here Ni-MoOx/TiO2 catalysts were prepared via simple impregnation. and the enhancement effects of Mo doping were comprehensively revealed. First, MoOx can attract electrons from Ni, reduce the electron density of Ni to improve the intrinsic activity of Ni, and form a Niδ+-(MoOx)δ? heterojunction to induce H2 heterolytic cleavage to active hydrogen ions. Second, the reduction of MoOx generates oxygen vacancies, which can absorb C═O of the fatty acid and facilitate the reaction progression. Third, a Ni1–xMox solid solution can be formed, which can increase the hydrogen adsorption quantity and accelerate the reaction rate. Finally, the bond strength of Mo–O is found to be the most optimum that can absorb the fatty acids while releasing the alcohols so as to recover the oxygen vacancies and avoid overhydrogenation. Therefore, high activity and selectivity for the hydrogenation of carboxylic acid substrates to alcohols can be obtained. Under significantly milder conditions (155 °C, 3 MPa H2) the catalyst provided a 98% yield of lauryl alcohol from lauric acid hydrogenation with a low activation energy of 40.1 kJ/mol. This work could provide an insightful understanding about the effects of Mo doping to Ni on catalyzing hydrogenation reactions.

Substances (6)

Materials
Procduct Name CAS Molecular Formula Supplier Price
Stearic acid 57-11-4 C18H36O2 1347 suppliers $6.00-$1154.00
Oleic acid 112-80-1 C18H34O2 1071 suppliers $5.00-$2148.30
Lauric acid 143-07-7 C12H24O2 845 suppliers $5.00-$4265.73
Cyclohexane 110-82-7 C6H12 806 suppliers $10.00-$8580.00
Palmitic acid 57-10-3 C16H32O2 663 suppliers $5.00-$1166.55
Heptafluorobutyric acid 375-22-4 C4HF7O2 299 suppliers $9.00-$4383.23

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