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首页> 外文期刊>ACS Sustainable Chemistry & Engineering >Thermal Conversion of Lignin-Cellulose Composite Particles into Aggregates of Fine Carbon Grains Holding Micro- and Mesoporous Spaces
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Thermal Conversion of Lignin-Cellulose Composite Particles into Aggregates of Fine Carbon Grains Holding Micro- and Mesoporous Spaces

机译：木质素-纤维素复合颗粒热转化为具有微孔和中孔空间的细碳粒聚集体

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Composite particles of lignin-hydroxyethylcellulose were fabricated by means of reverse-micelle formation using H2O-CHCl3 in the presence of a surfactant, and an aggregate of the particles was obtained by successive precipitation from acetone, filtration, and drying. The aggregate was carbonized by pyrolysis with heating up to 900 °C under flowing of argon. The carbonized product was a hierarchical porous carbon that had a Brunauer-Emmett-Teller (BET) surface area of 405 m~2 /g with micropore volume (0.11 cm~3 /g) and no small mesopore volume (0.58 cm~3 /g). Higher-porous spherical-carbon aggregates were obtained by fitting an in situ surface activation in the carbon conversion process, i.e., composite particles similarly prepared from lignin and hydroxyethylcellu- lose in the presence of NaOH were carbonized. One of them showed a BET surface area of 1790 m~2 /g with a micropore volume (0.54 cm~3 /g) and large mesopore volume (2.08 cm~3 /g). This in situ activation process added micropores and mesoporous cavities to the microporous carbon grains and enhanced development of mesoporous voids between the grains. The aggregate of the activated carbon grains in 1 M H2SO4 showed a good electrical double layer capacitance of 394 F/g at a current density of 0.05 A/g, which declined logarithmic functionally to 269 F/g at a higher current density of 0.4 A/g.
机译：木质素-羟乙基纤维素的复合颗粒通过在表面活性剂存在下使用H 2 O-CHCl 3的逆胶束形成来制备，并且通过从丙酮连续沉淀，过滤和干燥来获得颗粒的聚集体。通过在氩气流下加热至900℃，通过热解将骨料碳化。碳化产物为分级多孔碳，其BET表面积为405 m〜2 / g，微孔体积（0.11 cm〜3 / g），中孔体积不小（0.58 cm〜3 / g）。 G）。通过在碳转化过程中进行原位表面活化来获得较高孔隙度的球形碳聚集体，即，类似地由木质素和羟乙基纤维素在NaOH存在下制备的复合颗粒被碳化。其中之一显示出BET表面积为1790m 2 / g，具有微孔体积（0.54cm 3 / g）和大的中孔体积（2.08cm 3 / g）。该原位活化过程向微孔碳晶粒增加了微孔和中孔腔，并增强了晶粒之间的中孔空隙的发展。活性炭颗粒在1 M H2SO4中的聚集体在0.05 A / g的电流密度下显示出394 F / g的良好双电层电容，在更高的0.4 A的电流密度下，其对数功能下降至269 F / g /G。

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