以乙酸镁和柠檬酸镁为模板(MgO)镁源,沥青为碳前驱体,在氮气氛中950℃一步炭化制得高表面积中孔炭材料.采用1 mol/L的HCl去模,并将炭材料洗涤至中性.采用低温N2吸附测得炭材料的比表面积和孔径分布,透射电镜观察炭材料的内部结构特征.结果表明:尽管未经活化,所得炭材料中的孔大多为中孔,BET比表而积达到1295 m2/g,当以柠檬酸镁为MgO前驱体时,所得炭材料的收率可高达50%.
Mesoporous carbons with high surface area were successfully prepared from a pitch using MgO as a tem-plate. The mixtures of the pitch and the MgO precursors (magnesium acetate and citrate) with different mass ratios in powder form were carbonized at 950℃ in nitrogen. The MgO was dissolved using a 1 mol/L hydrochloric acid aqueous solution after carbonization and the porous carbons formed were isolated. The results indicated that most of the pores in the carbons were mesopores, which were generated as a result of the templating action of MgO formed by pyrolysis of the MgO precursors. The BET surface area of the carbons could reach up to 1 295 m2/g although no activation was per-formed. The carbon yield was as high as 50% mass fraction when magnesium citrate was used as the MgO precursor.
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