預氧化對煤液化瀝青制備超級活性炭的影響研究
發(fā)布時間：2018-08-02 07:31
【摘要】：以神華煤直接液化瀝青(CLA)為碳源,針對其熔點低、易形成液相炭化、不利于制備超級活性炭的難題,采用KNO3預氧化、KOH活化的方法,制備出比表面積超過3000m2/g的超級活性炭。利用掃描電鏡(SEM)、低溫氮吸附儀(BET)、紅外光譜儀(IR)等多種手段對預氧化瀝青、炭化瀝青和活性炭產品進行了表征測試。發(fā)現預氧化可避免煤液化瀝青在炭化過程中的相態(tài)變化,產生具有初級孔道、富含官能團活性點的炭化物,為制備超級活性炭奠定了物質結構基礎。在m(KNO3)/m(CLA)為0~0.4之間,活性炭的比表面積隨著KNO3的用量增加先增后減。在預氧化溫度250~400℃之間,活性炭的比表面積隨著預氧化溫度的升高先增后減,拐點為350℃。在預氧化時間30~60min內,活性炭的比表面積隨著預氧化時間的延長逐漸增大,超過60min,延長預氧化時間對活性炭比表面積基本無影響。
[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，
本文編號：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，
本文編號：2158648
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