摘要
以水葫芦为原料,利用高温高压反应釜对240℃、停留时间0.5~24.0h下水热炭物化结构的演变特性进行分析.研究发现：不同停留时间下焦炭的产率及O/C和H/C原子比的范围分别为22.17%~31.67%,0.19~0.45和0.94~1.51,焦炭的热值范围为16.83~20.63 MJ/kg.通过对焦炭进行分析测试,探讨水热炭的生成机理以及炭微球的形成机制,结果表明：4.0h后延长停留时间对焦炭的化学特性没有明显的影响;但是随着时间的进一步延长,水热炭却表现出较好的结构特性,可以观察到焦炭表面有大量微球的生成,具有典型的核壳结构,炭微球的表面含有大量的活性含氧官能团,内部则为低活性的含氧官能团;水热炭比表面积随着时间的延长先增大后减小.
Hydrothermal carbonization of water hyacinth was conducted in an autoclave from 0.5hto24.0hat 240 ℃,the physicochemical characteristics of water hyacinth hydro-char was investigated.The results show that hydro-char yield,oxygen/carbon ratio,and hydrogen/carbon ratio in all hydrochar products are 22.17%to 31.67%,0.19 to 0.45,and 0.94 to 1.51,respectively,and higher heating value of hydro-char products is 16.83 to 20.63 MJ/kg.To further investigate the hydrothermal formation mechanism and carbon microspheres formation mechanism,it is indicated that there′s no significant change in the chemical properties of hydro-char after 4.0h,but with time increasing,the hydro-char show better structural characteristics.The surface generates a large number of microspheres with a typical core-shell structure and the surface of carbon microspheres contains large amounts of reactive oxygen-containing functional groups,compares with low activity of the internal oxygen-containing functional groups,and specific surface area increases first,and then decreases with the time increasing.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2015年第6期116-121,共6页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
中国博士后科学基金资助项目(2014M552053)
国家自然科学基金资助项目(51406063)
关键词
水葫芦
焦炭
水热碳化
炭微球
理化性质
water hyacinth
hydro-char
hydrothermal carbonation
carbon microspheres
physico-chemical characteristics
