Catalytic cracking of oleic acid to generate aviation kerosene using platinum–modified ZSM–5 nanosheets

BACKGROUND A series of Pt@NZSM–5 and Pt/NZSM–5 nanosheets having different Si/Al ratios were prepared via an in situ synthesis and impregnation method, respectively, using C 22 H 45 –N + (CH 3 ) 2 –C 6 H 12 –N + (CH 3 ) 2 –C 6 H 13 (C 22–6–6 ) as the template agent. The oleic acid decarboxylation reaction was carried out using these materials under CO 2 atmosphere and the oleic acid cracking mechanism was inferred from the product distribution of the C8-C17 alkanes. RESULTS The Pt@NZSM–5 and Pt/NZSM–5 was found to comprise thinner nanosheets and exhibited strong metal–substrate interactions. Pt@NZSM–5 nanosheets with a Si/Al molar ratio of 100 had thicknesses of only 8–9 nm along with a mesopore/micropore capacity ratio of 2.7, an acid content of 11 cm 3 /g STP and a high Pt 0 /PtO x ratio. CONCLUSION The Pt@NZSM-5 and Pt/NZSM-5 nanosheets had an interconnected hierarchical system and a large number of metal active sites that facilitated the decarboxylation of oleic acid. The Pt@NZSM–5 nanosheets demonstrated excellent catalytic activity during the cracking of oleic acid under a CO 2 atmosphere, giving a yield of C8–C17 alkanes as high as 83.8% after 5 h at 320 °C. These Pt@NZSM–5 nanosheets also showed greater stability than the Pt/NZSM–5 specimens. © 2024 Society of Chemical Industry (SCI).