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Green Synthesis of Furfural Acetone by Solvent-Free Aldol Condensation of Furfural with Acetone over La2O3–MgO Mixed Oxide Catalyst
journal contribution
posted on 2019-08-23, 20:14 authored by Deepak
S. Desai, Ganapati D. YadavConversion of biomass,
whether fresh or waste, into valuable chemicals
and intermediates will be very useful to reduce dependence on fossil
feedstock. Furfural is a biomass-derived chemical which can be valorized.
Furfural acetone (FAc) is used as an intermediate in fine chemical
industries and produced by using polluting homogeneous basic catalysts.
In the current study, La–Mg mixed oxide (MO) catalysts with
various mole ratios were prepared by hydrothermal (H) and combustion
(C) methods for the preparation of FAc. It was found that moderate
to strong basicity of the La1Mg3MO-H catalyst
prepared by the hydrothermal method vis-à-vis La1Mg3MO-C helps to attain a highly selective cross-aldol
condensation reaction of furfural with acetone. In the current reaction
process, high conversion of furfural (96%) and high selectivity of
FAc (98%) were achieved after 7 h of reaction time. The catalyst was
well characterized by various analytical orthogonal techniques such
as FTIR, DCS-TGA, SEM-EDX, BET, TPD, and XRD. A solvent-free reaction
engineering approach was adopted to eliminate the undesired byproducts,
and also, the use of hazardous solvents was avoided. A kinetic model
based on the proposed reaction mechanism was developed, which follows
the LHHW mechanism with weak adsorption of all species. The activation
energy of the cross-aldol condensation of furfural with acetone was
found to be 12.11 kcal/mol.
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Furfural acetoneFurfural AcetoneTPDhydrothermalundesired byproductsmethodreaction timeDCS-TGABETmole ratiosMO-CXRDcross-aldol condensation7 hreaction mechanismLa 1 Mg 3 MO-H catalystFTIRfurfuralcross-aldol condensation reactionGreen SynthesisSolvent-Free Aldol Condensationreaction processchemical industriesbiomass-derived chemicalorthogonal techniquesFAcLHHW mechanismsolvent-free reaction engineering approachSEM-EDXactivation energy
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