College of Engineering, Heilongjiang Bayi Agricultural University, Daqing 163319, China; Department of Biological and Agricultural Engineering, Kansas State University, Manhattan, KS 66506, United States.
Department of Biological and Agricultural Engineering, Kansas State University, Manhattan, KS 66506, United States.
Bioresour Technol. 2019 Dec;293:122035. doi: 10.1016/j.biortech.2019.122035. Epub 2019 Aug 21.
This work studied the association between biomass types and MgO pretreatment using representative agricultural residues (corn stover, sorghum stalk, and wheat straw), energy crops (miscanthus, switchgrass, and big bluestem), and woody biomass (poplar). Differences in biomass chemical components (24.7-40.3% cellulose, 17.4-27.6% hemicellulose, 12.1-22.0% lignin, and 5.1-38.3% extractives) and the amount of acetic acid (1.9-5.3%) affected biomass structure and pretreatment severity. Optimal pretreatment temperature and time were 170 °C and 40 min for wheat straw and switchgrass; 180 °C and 30 min for miscanthus and poplar; and 180 °C and 40 min for corn stover, sorghum stalk, and big bluestem. Big bluestem and poplar have a larger amount of acetic acid and required more MgO loading (0.12 mol/L). Except for sorghum stalk (0.10 mol/L), the rest required less MgO loading (0.08 mol/L). Approximate MgO loading completely neutralized released acetic acid during pretreatment, reducing sugar degradation and eliminating inhibitor formation.
本研究采用具有代表性的农业废弃物（玉米秸秆、高粱秸秆和小麦秸秆）、能源作物（芒草、柳枝稷和大刍草）和木质生物质（杨树），研究了生物质类型与 MgO 预处理之间的关系。生物质化学组分（24.7-40.3%纤维素、17.4-27.6%半纤维素、12.1-22.0%木质素和 5.1-38.3%抽提物）和乙酸含量（1.9-5.3%）的差异影响了生物质结构和预处理的严重程度。对于小麦秸秆和柳枝稷，最佳预处理温度和时间分别为 170°C 和 40min；对于芒草和杨树，最佳预处理温度和时间分别为 180°C 和 30min；对于玉米秸秆、高粱秸秆和大刍草，最佳预处理温度和时间分别为 180°C 和 40min。大刍草和杨树的乙酸含量较大，需要更多的 MgO 负载量（0.12mol/L）。除了高粱秸秆（0.10mol/L），其余的需要较少的 MgO 负载量（0.08mol/L）。近似的 MgO 负载量可在预处理过程中完全中和释放的乙酸，减少还原糖的降解并消除抑制剂的形成。
