印刻法制备中间相沥青基中孔炭(英文)

Preparation of mesophase pitch based mesoporous carbons using an imprinting method

用中间相沥青作碳源,硅胶水溶液作造孔剂,采用胶体印刻法制得一系列中孔碳。实验发现当适量纳米级硅源添加到中间相沥青中,会在彼此颗粒间形成一定的纳米孔道,从而导致中间相沥青在炭化过程中没有沥青由固相向液相转化的过程。结果表明:碳硅比、印刻温度以及中间相沥青的基本物化性质都将对中孔碳的孔结构发生重要影响。且制得比表面积和孔容分别为482m2/g和1.62cm3/g的中孔碳。

Mesoporous carbons （MCs） were prepared by an imprinting method, using mesophase pitch and nanometer colloidal silica solution as carbon precursors and pore generators, respectively. The effects of the type of mesophase pitch, the imprinting temperature, and the silica content on the porous properties of MCs were investigated. It was found that the pore size distributions of MCs were similar irrespective of the imprinting temperature and the amount of silica used because of the imprinting mechanism. The mesopore volume of MCs increased with an increasing amount of silica. There existed an optimum imprinting temperature slightly higher than the softening point of the mesophase pitch used. Easy imprinting was found for naphthalene based mesophase pitch with a low softening point and fine average particle size as compared with a coal based mesophase pitch. Mesoporous carbons were provided with a specific surface area and a total pore volume of 482 m^2/g and 1.62 cm^3/g, respectively.