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7857200 
Journal Article 
Integration of Heterogeneous Acid and Base Catalysis for Clean Synthesis of Jet-Fuel Precursor from Carbohydrates 
Shinde, S; Tarade, K; Mitra, G; Rode, C 
2020 
ChemistrySelect
ISSN: 2365-6549 
WILEY-V C H VERLAG GMBH 
WEINHEIM 
5 
1 
392-400 
English 
WOS:000506438700050 
C12 branched alkane fuel precursor was produced from carbohydrates using an efficient integrated solid acid and base catalysis approach involving: i) isomerisation-dehydration of carbohydrates to 5-(hydroxymethyl)furfural (HMF) over solid acid catalyst having both Lewis and Brónsted sites) in a biphasic MIBK (methylisobutylketone): water + DMSO solvent system and ii) Claisen-Schmidt condensation of crude HMF with MIBK over solid base catalyst. Initially, high yield of jet fuel precursor, (E)-1-(5-(hydroxymethyl)furan-2-yl)-5-methylhex-1-en-3-one from pure HMF and MIBK was achieved over basic CaMgAl(231) catalyst. The glucose dehydration to HMF was optimized in biphasic MIBK: H2O-NaCl: DMSO (8:1.5:0.5; v/v/v) system, with complete glucose conversion and 42% HMF yield over Zr-Mont possessing both Lewis and Brønsted acid sites. In an integrated dehydration + Claisen-Schmidt condensation sequence, Zr-Mont catalyst was filtered off and the crude HMF with MIBK underwent Claisen-Schmidt condensation over CaMgAl(231) catalyst. The overall 32% yield of Claisen-Schmidt condensation product was achieved from glucose. MIBK acting also as a product extractant, could be recovered upto 80%. © 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim 
Claisen-Schmidt condensation; dehydration; integrated; jet-fuel precursor; renewable