双模板结构导向剂制备有序介孔炭

Synthesis of ordered mesoporous carbon with dual templates as structure directing agents

以间苯二酚/甲醛制备的酚醛树脂为碳前躯体,三嵌段共聚物F127和P123作为主辅结构导向剂,采用有机-有机自组装的方法制备有序介孔炭(Ordered mesoporous carbons,简称OMCs)。采用X射线衍射仪、透射电镜和N2吸/脱附手段对所制OMCs进行表征,研究了反应时间以及主辅模板剂的比例对介孔孔道结构的影响。结果表明,随着反应时间从24h延长至72 h,介孔炭有序性先增后减;当主辅模板剂F127/P123摩尔比为0.002 7∶0.002 7时,所得介孔炭有序性较好,为P6mm型孔道结构,介孔孔容和比表面积分别为0.59 cm3/g和640.34 m2/g,平均孔径为3.68 nm.

Ordered mesoporous carbons were prepared by pyrolysis of polymer blends,which were formed by the organic-organic self-assembly of resorcinol-formaldehyde pre-polymers and tri-block copolymers under acidic conditions.The tri-block copolymer mixtures of F127 and P123 were used as structure-directing agents.The samples were characterized by X-ray diffraction,transmission electron microscopy and nitrogen adsorption.Results show that the degree of order of mesoporous carbons exhibits a maximum with increasing holding time from 24 to 72 h.When the molar ratio of the F127 to P123 is 1,the mesoporous carbon obtained has the most ordered hexagonal mesostructure（P6mm）,with a typical BET surface area of 640.34 m^2/g,pore size of 3.68 nm and pore volume of 0.59 cm^3/g.