多级孔生物质碳材料的制备及其应用研究

发布时间：2018-06-27 21:49

  本文选题：多级孔碳材料 + SBA-15　； 参考：《东南大学》2017年硕士论文

【摘要】：多级孔碳材料作为一种新型的碳材料,近年来受到研究者们的广泛关注。它克服了传统多孔碳材料结构单一的缺点,结合了不同级别孔径的结构特点。其中多级微孔-介孔碳材料结合了微孔和介孔结构的特征,具有比表面积大、孔容高、机械强度高、化学惰性和热稳定性好等优点,现已被广泛的应用于多个领域。大气中CO2浓度的急剧上升是造成温室效应的主要因素,而寻找合适的吸附剂用于吸收烟道气中的CO2则是目前解决该问题最直接有效的手段。因此,本论文研究简单的方法合成多级孔碳材料,对其进行优化并用于CO2吸附过程。采用多步法以SBA-15为硬模板合成多级孔碳材料,考察了浸溃次数、碳化温度、碳化时间对介孔碳结构的影响,最佳合成条件下的介孔碳经CO2活化处理制备多级孔碳,并考察了活化时间和活化温度对材料结构和C02吸附性能的影响。结果表明浸渍两次、900℃碳化4 h的介孔碳具有最佳的孔道结构,该条件下的介孔碳在900℃活化4 h后得到的多级孔碳的比表面积达到2124.9 m2/g,总孔容达到2.27 cm3/g,C02的吸附量达到3.41 mmol/g。采用一步法以F127为软模板合成多级孔碳材料,考察了水热温度、模板剂用量、碳化温度及TEOS添加量对多级孔碳结构的影响,结果表明水热温度130℃、F127用量0.5 g、碳化温度800℃及TEOS添加量11 mL是最佳合成条件。将该条件下的多级孔碳进行C02活化,结果表明在900℃下活化4h后,材料的比表面积、总孔容和CO2吸附量分别由1574.2 m2/g、1.19 cm3/g、2.32 mmol/g 升高至 2437.6 m2/g、2.17 cm3/g、3.60 mmol/g。采用一步法以DDAC为软模板合成多级孔碳材料,考察了水热温度、模板剂用量、TEOS添加量及碳化温度对多级孔碳材料结构的影响,表明水热温度110℃、F127用量1.0g、TEOS添加量9mL及碳化温度700℃为最佳合成条件。将该条件下的多级孔碳进行C02活化,结果表明在900℃活化4 h后,材料的比表面积、总孔容和CO2吸附量分别由1704.0 m2/g、1.09 cm3/g、2.11 mmol/g升高至 2526.6 m2/g、1.84 cm3/g、3.54 mmol/g。
[Abstract]:As a new type of carbon materials, multilevel porous carbon materials have been paid more and more attention by researchers in recent years. It overcomes the shortcoming of single structure of traditional porous carbon materials and combines the structural characteristics of different pore sizes. Multistage microporous and mesoporous carbon materials have been widely used in many fields due to their high specific surface area, high pore capacity, high mechanical strength, high chemical inertia and good thermal stability due to the combination of micropore and mesoporous structure. The sharp increase of CO _ 2 concentration in the atmosphere is the main factor causing Greenhouse Effect, and finding suitable adsorbent to absorb CO _ 2 in flue gas is the most direct and effective way to solve this problem. Therefore, a simple method for synthesizing multilevel porous carbon materials has been studied in this paper, and optimized for CO2 adsorption process. The effects of immersion times, carbonation temperature and carbonation time on the structure of mesoporous carbon were investigated by using SBA-15 as hard template. The mesoporous carbon was prepared by CO2 activation under the optimum synthesis conditions. The effects of activation time and activation temperature on the structure and adsorption properties of CO2 were investigated. The results show that the mesoporous carbon impregnated twice at 900 鈩，

本文编号：2075392