Ma Jianru, Li Wenzhi, Guan Shengnan, Liu Qiying, Li Qingqing, Zhu Chaofeng, Yang Tao, Ogunbiyi Ajibola Temitope, Ma Longlong
Laboratory of Basic Research in Biomass Conversion and Utilization, Department of Thermal Science and Energy Engineering, University of Science and Technology of China Hefei 230026 PR China
CAS Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences Guangzhou 510640 PR China
RSC Adv. 2019 Apr 4;9(19):10569-10577. doi: 10.1039/c9ra01411j. eCollection 2019 Apr 3.
Sulfonated graphene (SG) was prepared and employed to convert corn stalk and xylose into furfural. Transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FT-IR) were used to characterize SG. The effects of reaction time, temperature, substrate loading, catalyst dosage and solvents on the reaction were researched and optimized. SG exhibited high catalytic activity in the conversion of xylose and corn stalk to furfural. A fairly high furfural yield of 96% was achieved at 150 °C from xylose and a 71.9% furfural yield was obtained when using a 10.7 ratio (mass ratio: xylose to SG) at 140 °C. While a 48% furfural yield was obtained from corn stalk (based on the starting combined moles of xylan and glucan in corn stalk; yield was >100%, if based on only xylan) using a substrate loading (corn stalk to catalyst mass ratio) of 2.14 and a 19% 5-hydroxymethylfurfural (5-HMF) yield was obtained. What's more, a 43.9% yield of furfural was obtained in only 20 min. In addition, the reusability of SG was also investigated and shown to have good stability for xylose dehydration.
制备了磺化石墨烯（SG）并将其用于将玉米秸秆和木糖转化为糠醛。采用透射电子显微镜（TEM）、扫描电子显微镜（SEM）、X射线光电子能谱（XPS）和傅里叶变换红外光谱（FT-IR）对SG进行表征。研究并优化了反应时间、温度、底物负载量、催化剂用量和溶剂对反应的影响。SG在木糖和玉米秸秆转化为糠醛的反应中表现出高催化活性。在150℃下，木糖制糠醛的产率相当高，达到96%；在140℃下，当木糖与SG的质量比为10.7时，糠醛产率为71.9%。使用2.14的底物负载量（玉米秸秆与催化剂的质量比）时，从玉米秸秆中获得了48%的糠醛产率（基于玉米秸秆中木聚糖和葡聚糖的起始总摩尔数；如果仅基于木聚糖，产率>100%），并获得了19%的5-羟甲基糠醛（5-HMF）产率。此外，仅在20分钟内就获得了43.9%的糠醛产率。此外，还研究了SG的可重复使用性，结果表明其对木糖脱水具有良好的稳定性。
