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A comparative study of enzymatic hydrolysis and thermal degradation of corn stover: understanding biomass pretreatment

机译：玉米秸秆酶解和热降解的比较研究：了解生物质预处理

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摘要

The impacts of ionic liquid and alkaline pretreatments on the enzymatic hydrolysis and thermal degradation of corn stover were investigated to better understand the mechanism of biomass pretreatment. Corn stover samples were pretreated at a 5 wt% biomass loading in 1-butyl-3-methylimidazolium acetate ([C4mim] [OAc]) at different temperatures varying from 50 to 110 degrees C for 6 h. NaOH solutions of three different concentrations were used to pretreat the corn stover samples: 0.5 wt%, 1.0 wt% and 4.0 wt% at temperatures of 35 and 50 degrees C for 6 h. Different pretreatment conditions enabled various degrees of alteration to their structures. Structural factors which led to enhanced enzymatic digestibility and variations in thermal degradation behavior were compared and discussed. It was found that biomass pretreatment enhanced enzymatic digestibility of corn stover which was correlated with decrease in thermal degradation temperature and increased amount of materials degrading at lower temperatures. Pretreatment did not always lead to a decrease in activation energy of the thermal degradation of biomass samples. The activation energy was mainly influenced by cellulose crystallinity. XRD analysis also indicated that [C4mim][OAc] interacted with (101) and (10 (1) over bar) lattice planes of cellulose during the initial dissolution process.
机译：研究了离子液体和碱性预处理对玉米秸秆酶解和热降解的影响，以更好地了解生物质预处理的机理。将玉米秸秆样品在50到110摄氏度的不同温度下，以5 wt％的生物质负荷在乙酸1-丁基-3-甲基咪唑鎓盐（[C4mim] [OAc]）中预处理6小时。使用三种不同浓度的NaOH溶液在35和50摄氏度的温度下预处理玉米秸秆样品：0.5 wt％，1.0 wt％和4.0 wt％6小时。不同的预处理条件可以对其结构进行不同程度的改变。比较和讨论了导致增强的酶消化性和热降解行为变化的结构因素。发现生物质预处理增强了玉米秸秆的酶消化率，这与热降解温度的降低和在较低温度下降解的材料量的增加有关。预处理并不总是导致生物质样品热降解的活化能降低。活化能主要受纤维素结晶度影响。 XRD分析还表明，[C4mim] [OAc]在初始溶解过程中与纤维素的（101）和（10（1）跨栏）相互作用。

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