Microwave (MW) and conventional heating (CH) strategies were compared for the synthesis of fuel additives (alkyl levulinates) obtained from levulinic acid. Phosphomolybdic acid (PMA) and phosphotungstic acid (PTA)-containing graphitic carbon nitride (GCN) were synthesized and optimized to achieve 98% and 93% yield after 24 h (CH) as compared to 99% and 68% conversion at 150 & DEG;C after 10 min (MW) using GCN-PMA and GCN-PTA, respectively. Microwave irradiation significantly reduced reaction times, being a more sustainable approach for the synthesis of fuel additives including ethyl, isopropyl, butyl and allylic levulinates. Scale-up experiments were also performed by increasing the concentration from 0.28 M and up to 0.71 M of LA and a high productivity was obtained for optimum GCN-PMA under MW (226.31 mmol g(Cat)(-1) h(-1)) with respect to CH conditions (0.538 mmol g(Cat)(-1) h(-1)).
Microwave versus conventional promoted synthesis of fuel additives using graphitic carbon nitride supported catalysts
Polidoro, D;Selva, M;
2023-01-01
Abstract
Microwave (MW) and conventional heating (CH) strategies were compared for the synthesis of fuel additives (alkyl levulinates) obtained from levulinic acid. Phosphomolybdic acid (PMA) and phosphotungstic acid (PTA)-containing graphitic carbon nitride (GCN) were synthesized and optimized to achieve 98% and 93% yield after 24 h (CH) as compared to 99% and 68% conversion at 150 & DEG;C after 10 min (MW) using GCN-PMA and GCN-PTA, respectively. Microwave irradiation significantly reduced reaction times, being a more sustainable approach for the synthesis of fuel additives including ethyl, isopropyl, butyl and allylic levulinates. Scale-up experiments were also performed by increasing the concentration from 0.28 M and up to 0.71 M of LA and a high productivity was obtained for optimum GCN-PMA under MW (226.31 mmol g(Cat)(-1) h(-1)) with respect to CH conditions (0.538 mmol g(Cat)(-1) h(-1)).I documenti in ARCA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.