Catalytic conversion of hemicellulosic sugars from biomass towards levulinic acid production was conducted using modified-zeolite Y (commercial). The zeolite was treated by NaOH of different concentration (x M) before used for the conversion of C5 sugars to levulinic acid. The modified zeolites had a larger porosity and an increased concentration of stronger acid sites compared to the untreated zeolite. Levulinic acid yield of 4.6% (conversion of C5 sugar to levulinic acid: 42.7%) was maximized at 190 °C and reaction time of 180 min (batch reactor), when using the zeolite treated with 0.25 M NaOH. In addition, with the absence of C6 sugar, the conversion of C5 sugar was higher than that of C5-C6 sugar mixture. The present work provides a new heterogeneous catalytic approach for levulinic acid production from liquid hydrolysates (by-product of biomass utilization).

使用改性沸石Y（商业）将半纤维素糖从生物质催化转化为乙酰丙酸生产。在用于将C5糖转化为乙酰丙酸之前，用不同浓度（xM）的NaOH处理该沸石。与未处理的沸石相比，改性的沸石具有更大的孔隙率和更强的酸性位点的浓度。当使用经0.25 M NaOH处理的沸石时，在190°C和180分钟的反应时间（分批反应器）下，乙酰丙酸收率为4.6％（C5糖向乙酰丙酸的转化率：42.7％）达到最大。另外，在不存在C6糖的情况下，C5糖的转化率高于C5-C6糖混合物的转化率。