Enabling selectively one-pot tandem reductive coupling of n-octanoic acid toward pentadecane over fibrous Ni/Nb2O5 assembly

The highly efficient green catalytic synthesis of jet fuel from low-chain biomass molecules is very attractive to afford sustainable development. Herein, ultrafine Ni nanoparticles assembled on Nb 2 O 5 nanofibers were constructed and effectively utilized in the reductive coupling of n-octanoic acid, offering a novel approach distinct from traditional hydrogenation methods for fatty acids. During the process, a synergistic effect was observed between the metallic Ni phase and the fibrous Nb 2 O 5 , facilitating immediate ketonization following reduction. This enabled the conversion of n-octanoic acid into pentadecane, a crucial component of aviation kerosene. The key factor driving this conversion was the attainment of a production rate of 8-pentadecanone higher than that of n-octane, particularly under optimal conditions, resulting in a significant yield of pentadecane. The catalytic assessment results show that adjusting Ni loading altered the performance of the catalyst in which 1.0 % Ni/Nb 2 O 5 afforded the best catalytic activity. By precisely controlling the reaction temperature at 300 °C and maintaining a hydrogen pressure of 1 MPa, an impressive pentadecane yield of 70.5 % was achieved. This innovative approach, which combines reduction with ketonization, offers a promising strategy for producing long-carbon chain alkanes from short-carbon chain fatty acids within a single reactor. This not only reduces economic costs but also streamlines overall processes, presenting a significant advancement in sustainable fuel production.