Faculty of Engineering, Shenyang Agricultural University, Shenyang 110866, China.
Faculty of Engineering, Shenyang Agricultural University, Shenyang 110866, China.
Bioresour Technol. 2022 Aug;357:127342. doi: 10.1016/j.biortech.2022.127342. Epub 2022 May 20.
In this study, the effects of different pretreatment methods including phosphoric acid (PA), freeze drying (FD) and phosphoric acid-freeze drying combined (PA-FD) pretreatment on corn stover characteristics and pyrolysis of corn stover samples was investigated. The results demonstrated that the physiochemical properties of biochars varied significantly. In comparison, PA pretreatment could effectively remove a large portion of inorganics and improve the fuel characteristics. PA-CSB-600 had a greater HHV, lower O/C and H/C ratios, and a lower biochar energy yield (Y), indicating the possibility for an attractive fuel source. PA-FD pretreatment would significantly affected cell volume and caused mechanical damage to corn stover structure. As a sulfonated solid acid catalyst precursor, the results of cellulose catalytic hydrolysis indicated that the density of -SOH in FD-CSA was much higher than PA-FD-CSA, but lower surface special area. Specifically, PA-FD-CSB prepared at 600 °C resulted in the maximum increase of cellulose conversion by 34.7-81.3%.
在这项研究中，研究了不同预处理方法（包括磷酸（PA）、冷冻干燥（FD）和磷酸-冷冻干燥联合（PA-FD）预处理）对玉米秸秆特性和玉米秸秆样品热解的影响。结果表明，生物炭的理化性质有显著差异。相比之下，PA 预处理可以有效地去除大部分无机物，并改善燃料特性。PA-CSB-600 具有更高的高位热值（HHV）、更低的 O/C 和 H/C 比，以及更低的生物炭能量产率（Y），表明其可能是一种有吸引力的燃料来源。PA-FD 预处理会显著影响细胞体积，并对玉米秸秆结构造成机械损伤。作为磺化固体酸催化剂前体，纤维素催化水解的结果表明，FD-CSA 中的-SOH 密度远高于 PA-FD-CSA，但比表面积较低。具体来说，在 600°C 下制备的 PA-FD-CSB 使纤维素转化率最大提高了 34.7-81.3%。
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