以木质素为原料改变升温速率制得木质素基固体酸,通过X射线衍射、红外光谱、X射线光电子能谱对催化剂结构进行表征,以还原糖得率为考察指标,探究升温速率对木质素基固体酸结构及其催化水解纤维素性能的影响。结果表明:升温速率对木质素基固体酸的微观结构有较大影响,进而影响其催化性能。随着升温速率的减小,木质素基固体酸芳香碳层片的定向程度增加,尺寸明显增大,脂肪侧链减少,在空间的排列愈加有序;碳载体磺化反应性增强,磺酸基团密度增加,催化剂的吸附能力提高,最终使得还原糖得率明显增加。在升温速率为3℃/min时,磺酸基团密度可高达0.8mmol/g,还原糖得率高达60%,显著地提高了木质素基固体酸的催化活性。
Lignin-based solid acids were prepared from lignin by changing the heating rate.The structure of the catalysts were characterized by XRD,FT-IR and XPS.The effects of the heating rate on the structure of the acid and the catalytic performance in cellulose hydrolysis were investigated by taking the yield of reducing sugar as the index.The results shown that the heating rate had a great influence on the microstructure of the acids,and then affected their catalytic performance.With the decrease of the heating rate,the orientation degree and the size of aromatic carbon sheets increased obviously,and the alkyl side chains decreased,which made the aromatic carbon sheets of the acids arranged more orderly in space.Under this influence,the sulfonated reactivity of carbon precursors was enhanced,which increased the density of —SO3H,and the adsorption capacity was also improved,finally which resulted in an obvious increase of the reducing sugar yield.At the heating rate of 3℃/min,the density of —SO3H was as high as 0.8mmol/g,and the yield of reducing sugar can reach 60%,which significantly improved the catalytic activity of the acid.
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基金资助
国家自然科学基金(21576181);国家自然科学基金青年项目(21908151);中央引导地方科技发展专项资金项目(YDZX20201400001783);山西省“1331工程”资助(晋教科[2021]2号);山西省基础研究计划(20210302123179)
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