The present work explores the catalytic activity of various zeolites for the production of methyl levulinates from hemicellulose derived furfuryl alcohol and explores the performance of H-ZSM-5-50 zeolite in continuous flow alcoholysis. Methyl levulinate yields up to 80% were achieved at 170 °C (50 bar) using a high load (1.6 M furfuryl alcohol) feed at 0.2 mL min^–1 flow rate. Angelica lactones were produced in significant amounts as one of the side products, albeit in lower amounts in continuous flow mode. Catalyst deactivation occurred at high furfuryl alcohol load through formation of pore blocking polyfurfuryl alcohols. The zeolites showed good reusability after regeneration at 500 °C. The levulinate yields in ethanol and n-propanol were 20% lower.

中文翻译：

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使用沸石将糠醇连续流醇解为乙酰丙酮酸烷基酯

本工作探讨了各种沸石从半纤维素衍生的糠醇生产乙酰丙酸甲酯的催化活性，并探讨了H-ZSM-5-50沸石在连续流醇解中的性能。使用高负荷（1.6 M糠醇）进料，以0.2 mL min ^–1的流速在170°C（50 bar）时，乙酰丙酸甲酯的收率达到80％。当归内酯可作为副产物之一大量生产，尽管在连续流动模式下产量较低。在高糠醇负载下，催化剂的失活通过形成阻塞孔的聚糠醇而发生。沸石在500°C再生后显示出良好的可重复使用性。乙醇和正丙醇中的乙酰丙酸酯产率降低了20％。