Bimetallic PtNi/HAP catalyst facilitated decarboxylation of oleic acid into C8-C17 alkanes

The utilization of biomass as a feedstock for aviation kerosene production serves to alleviate demand pressure on petroleum resources. In this work, commercial hydroxyapatite (HAP) was used as a support to fabricate a series of mono- and bimetallic Pt-Ni catalysts via impregnation. These catalysts were then evaluated for the decarboxylation of oleic acid under a non-hydrogen atmosphere. The XRD and TEM analyses revealed that the Pt metal particles were highly dispersed, whereas the Ni particles exhibited a tendency toward aggregation with increasing loading. Furthermore, Pt-Ni bimetallic particles exhibited aggregation with elevated Ni content. Combined NH 3 -TPD and Py-IR characterization indicated that the 1.5Pt2Ni/HAP bimetallic catalyst possessed appropriate acidity(5.18 cm 3 /g STP) and abundant Lewis acid sites, as evidenced by a Brønsted-to-Lewis ratio of 0.32. Catalytic results demonstrated that under CO 2 atmosphere at 340 °C and 18 bar for 6 h, the 1.5Pt2Ni/HAP catalyst achieved complete conversion of oleic acid and the yield of C 8 -C 17 alkanes reached as high as 85.0%.