Fast pyrolysis is as a promising and versatile technology to depolymerize and concentrate sugars from lignocellulosic biomass. The pyrolysis liquids produced contain considerable amounts of levoglucosan (1,6-anhydro-β-d-glucopyranose), which is an interesting source for glucose (GLC). Here, we report a kinetic study on the conversion of levoglucosan (LG) to GLC in water using sulfuric and acetic acid as the catalysts under a wide range of conditions in a batch setup. The effects of the initial LG loading (0.1–1 M), sulfuric and acetic acid concentrations (0.05–0.5 M and 0.5–1 M, respectively), and reaction temperatures (80–200 °C) were determined. Highest GLC yields were obtained using sulfuric acid (98 mol %), whereas the yields were lower for acetic acid (maximum 90 mol %) due to the formation of byproducts such as insoluble polymers (humins). The experimental data were modeled using MATLAB software, and relevant kinetic parameters were determined. Good agreement between experimental and model was obtained when assuming that the reaction is first order with respect to LG. The activation energies were 123.4 kJ mol^–1 and 120.9 kJ mol^–1 for sulfuric and acetic acid, respectively.

中文翻译：

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布朗斯台德酸为催化剂将左旋葡聚糖转化为葡萄糖的动力学研究

快速热解是一种从木质纤维素生物质中解聚和浓缩糖的有前途且用途广泛的技术。产生的热解液含有大量左旋葡聚糖（1,6-脱水-β- d-吡喃葡萄糖），这是葡萄糖（GLC）的有趣来源。在这里，我们报告了在硫酸盐和乙酸为催化剂的情况下，在各种条件下以批量方式将左旋葡聚糖（LG）转化为水的GLC的动力学研究。确定了初始LG负荷（0.1-1 M），硫酸和乙酸浓度（分别为0.05-0.5 M和0.5-1 M）和反应温度（80-200°C）的影响。使用硫酸（98 mol％）可获得最高的GLC收率，而乙酸的收率较低（最大90 mol％），这是由于形成了副产物，例如不溶性聚合物（腐殖质）。使用MATLAB软件对实验数据进行建模，并确定相关的动力学参数。当假设反应是关于LG的一阶反应时，在实验和模型之间获得了良好的一致性。活化能为123.4 kJ mol硫酸和乙酸分别为^–1和120.9 kJ mol ^–1。