Acidic graphene organocatalyst for the superior transformation of wastes into high-added-value chemicals
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Date
2022
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Abstract
Our dependence on finite fossil fuels and the insecure energy supply chains
have stimulated intensive research for sustainable technologies. Upcycling
glycerol, produced from biomass fermentation and as a biodiesel formation
byproduct, can substantially contribute in circular carbon economy. Here, we
report glycerol’s solvent-free and room-temperature conversion to high
added-value chemicals via a reusable graphene catalyst (G-ASA), functiona
lized with a natural amino acid (taurine). Theoretical studies unveil that the
superior performance of the catalyst (surpassing even homogeneous, indus
trial catalysts) is associated with the dual role of the covalently linked taurine,
boosting the catalyst’s acidity and affinity for the reactants. Unlike previous
catalysts, G-ASA exhibits excellent activity (7508 mmolg−1 h−1)andselectivity
(99.9%) for glycerol conversion to solketal, an additive for improving fuels’
quality and aprecursorofcommodityandfinechemicals.Notably,thecatalyst
is also particularly active in converting oils to biodiesel, demonstrating its
general applicability.