预氧化对煤液化沥青制备超级活性炭的影响研究
发布时间：2018-08-02 07:31
【摘要】：以神华煤直接液化沥青(CLA)为碳源,针对其熔点低、易形成液相炭化、不利于制备超级活性炭的难题,采用KNO3预氧化、KOH活化的方法,制备出比表面积超过3000m2/g的超级活性炭。利用扫描电镜(SEM)、低温氮吸附仪(BET)、红外光谱仪(IR)等多种手段对预氧化沥青、炭化沥青和活性炭产品进行了表征测试。发现预氧化可避免煤液化沥青在炭化过程中的相态变化,产生具有初级孔道、富含官能团活性点的炭化物,为制备超级活性炭奠定了物质结构基础。在m(KNO3)/m(CLA)为0~0.4之间,活性炭的比表面积随着KNO3的用量增加先增后减。在预氧化温度250~400℃之间,活性炭的比表面积随着预氧化温度的升高先增后减,拐点为350℃。在预氧化时间30~60min内,活性炭的比表面积随着预氧化时间的延长逐渐增大,超过60min,延长预氧化时间对活性炭比表面积基本无影响。
[Abstract]:In view of the problem of low melting point, easy to form liquid carbonization and unfavorable to the preparation of super activated carbon, the superactivated carbon with specific surface area exceeding 3000m2/g was prepared by the method of KNO3 pre-oxidation and Koh activation with Shenhua coal direct liquefaction asphalt as carbon source. The preoxidized asphalt, carbonized asphalt and activated carbon products were characterized by scanning electron microscope (SEM) (SEM), low temperature nitrogen adsorption instrument (SEM),) and (BET), infrared spectrometer (IR). It is found that preoxidation can avoid the phase change of coal liquefaction asphalt during carbonization and produce carbonized materials with primary pore and rich functional group active point, which lays the material structure foundation for the preparation of super activated carbon. When the ratio of m (KNO3) / m (CLA) is 0 ~ 0. 4, the specific surface area of activated carbon increases first and then decreases with the increase of KNO3 content. At the preoxidation temperature of 250 ~ 400 鈩，
本文编号：2158648
[Abstract]:In view of the problem of low melting point, easy to form liquid carbonization and unfavorable to the preparation of super activated carbon, the superactivated carbon with specific surface area exceeding 3000m2/g was prepared by the method of KNO3 pre-oxidation and Koh activation with Shenhua coal direct liquefaction asphalt as carbon source. The preoxidized asphalt, carbonized asphalt and activated carbon products were characterized by scanning electron microscope (SEM) (SEM), low temperature nitrogen adsorption instrument (SEM),) and (BET), infrared spectrometer (IR). It is found that preoxidation can avoid the phase change of coal liquefaction asphalt during carbonization and produce carbonized materials with primary pore and rich functional group active point, which lays the material structure foundation for the preparation of super activated carbon. When the ratio of m (KNO3) / m (CLA) is 0 ~ 0. 4, the specific surface area of activated carbon increases first and then decreases with the increase of KNO3 content. At the preoxidation temperature of 250 ~ 400 鈩，
本文编号：2158648
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