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 C22H45-N+(CH3)(2)-C6H12-N+(CH3)(2)-C6H13 (C22-6-6) as the template agent. The oleic acid decarboxylation reaction was carried out using these materials under CO2 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/PtOx 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 CO2 atmosphere, giving a yield of C8-C17 alkanes as high as 83.8% after 5 h at 320 degrees C. These Pt@NZSM-5 nanosheets also showed greater stability than the Pt/NZSM-5 specimens. (c) 2024 Society of Chemical Industry (SCI).