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Corncob lignocellulose for the production of furfural by hydrothermal pretreatment and heterogeneous catalytic process

机译：玉米芯木质纤维素的水热预处理和非均相催化过程生产糠醛

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Corncob with a high content of pentose-rich hemicelluloses shows great potential for furfural production. In this paper, an environmentally-friendly two-step process for furfural production was developed by the hydrothermal pretreatment of corncob and the heterogeneous catalysis of the hydrolysate using a solid acid catalyst. The hydrothermal pretreatment was applied to release hemicelluloses from the cell wall of the corncob, which were hydrolyzed into monosaccharide and oligosaccharide under the investigated conditions (160-190 degrees C, 0-60 min). Subsequently, heterogeneous catalysis of the hydrolysate obtained from the hydrothermal pretreatment was performed using SO42-/SiO2-Al2O3/La3+ as a solid acid catalyst at 150 degrees C for 2.5 h. The maximum yield of furfural achieved was up to 21% under the investigated experimental conditions from the catalysis of hydrolysates obtained at 190 degrees C for 60 min in the hydrothermal process. Moreover, there was no obvious change in the catalytic activity of SO42-/SiO2-Al2O3/La3+ after four runs, and only a decline of 5.28% yield of furfural was observed. This two-step process is an environmentally-friendly process for furfural production from pentose-rich biomass and serves as an effective approach for recovering the solid catalyst from the reaction medium.
机译：富含戊糖的半纤维素含量高的玉米芯显示出糠醛生产的巨大潜力。在本文中，通过玉米芯的水热预处理和使用固体酸催化剂的水解产物的多相催化，开发了一种环保的糠醛生产两步法。施加水热预处理以从玉米芯的细胞壁释放半纤维素，在研究的条件下（160-190摄氏度，0-60分钟）将其水解为单糖和寡糖。随后，使用SO42- / SiO2-Al2O3 / La3 +作为固体酸催化剂，在150℃下对水热预处理得到的水解产物进行了2.5 h的非均相催化。在所研究的实验条件下，通过在水热过程中在190摄氏度下催化60分钟获得的水解产物的催化作用，糠醛的最大收率高达21％。而且，四次运行后，SO42- / SiO2-Al2O3 / La3 +的催化活性没有明显变化，糠醛收率仅下降了5.28％。该两步法是从富含戊糖的生物质生产糠醛的环保方法，并且是从反应介质中回收固体催化剂的有效方法。

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