Synthesis of renewable aviation fuel additives with aromatic aldehydes and methyl isobutyl ketone under solvent-free conditions

Aviation fuel range high-density bicycloalkanes were selectively synthesized with methyl isobutyl ketone (MIBK) and aromatic aldehydes which can be derived from lignocellulose. First, a series of aviation fuel precursors were obtained by the solvent-free aldol condensation of methyl isobutyl ketone...

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Bibliographic Details
Published in:Sustainable energy & fuels 2021-01, Vol.5 (2), p.556-563
Main Authors: Han, Fengan, Xu, Jingyuan, Li, Guangyi, Xu, Jilei, Wang, Aiqin, Cong, Yu, Zhang, Tao, Li, Ning
Format: Article
Language:English
Subjects:
Additives
Aldehydes
Aviation fuel
Catalysts
Condensates
Condensation products
Density
Freezing
Fuel additives
Fuels
Ketones
Lignocellulose
Melting points
Methyl isobutyl ketone
Resins
Solvents
Thermal stability
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Summary:Aviation fuel range high-density bicycloalkanes were selectively synthesized with methyl isobutyl ketone (MIBK) and aromatic aldehydes which can be derived from lignocellulose. First, a series of aviation fuel precursors were obtained by the solvent-free aldol condensation of methyl isobutyl ketone (MIBK) and aromatic aldehydes. Among the investigated catalysts, Amberlyst-15 resin exhibited the highest activity. On the basis of characterization, the good performance of Amberlyst-15 resin can be attributed to its bigger surface area, and higher acid site amount and acid strength. Subsequently, the aldol condensation products were further converted to bicycloalkanes by solvent-free hydrodeoxygenation (HDO). A commercial Ru/C catalyst exhibited the highest activity for the HDO process. Over it, high yields (∼95%) of aviation fuel range bicycloalkanes were achieved under mild conditions. According to characterization results, the excellent performance of the Ru/C catalyst might be rationalized by its relatively higher acid strength and better metal dispersion. The bicycloalkanes obtained in this work have high densities (0.895-0.902 g mL −1 ) and low freezing points (223.2-230.0 K). In real applications, they can be used as high-density aviation fuels or additives to improve the volumetric heat values and thermal stability of current aviation fuels. High-density and low freezing point dicycloalkanes were synthesized by the aldol condensation of methyl isobutyl ketone with aromatic aldehydes followed by hydrodeoxygenation under solvent-free conditions.
ISSN:2398-4902
2398-4902
DOI:10.1039/d0se01544j