热解自活化法制备生物质基微孔型活性炭(英文)
发布时间:2018-05-03 19:54
本文选题:生物质 + 微孔活性炭 ; 参考:《新型炭材料》2017年05期
【摘要】:提出热解自活化制备生物质基活性炭的新方法,制备过程不添加任何活化剂。将生物质原料置于可密闭反应器,在高温高压条件下进行热解自活化反应。结果表明,椰子壳是热解自活化制备微孔型活性炭的最佳原料,选择活化温度900℃并保持6 h,制备出了具有网络状发达微孔结构的活性炭,微孔率高达87.8%,比表面积1 194.4 m~2/g,总孔容积0.528 cm~3/g,碘吸附值1 280 mg/g,亚甲基蓝吸附值315 mg/g。同时,作为电化学储能电极材料,比电容可达258 F/g,而且阻抗小,3 000次充电循环后比电容仍能保持97.2%。热解自活化机理研究表明,生物质热解过程中产生的水蒸气、二氧化碳和反应器内的空气形成了良好的活化气氛,密闭反应器内形成的自生压力促进了水蒸气/二氧化碳与固体炭的活化反应速度,明显提高了微孔率。为了验证热解自活化法对其他生物质原料的适用性,还选择了杏核、核桃壳和松木屑作为原料进行热解自活化实验,并制得了高吸附力的活性炭样品。因此,热解自活化是一种无污染、清洁方便、产品得率高的新型活化方法,可产生良好的经济和环境效益。
[Abstract]:A new method of preparing biomass based activated carbon by pyrolysis and self-activation without adding any activators was proposed. Biomass feedstock was placed in a sealed reactor and pyrolysis self-activation reaction was carried out under high temperature and high pressure. The results showed that coconut shell was the best raw material for the preparation of microporous activated carbon by pyrolysis and self-activation. The activated carbon with network developed microporous structure was prepared by selecting the activation temperature at 900 鈩,
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