摘要
采用十六烷基三甲基溴化铵(CTAB)作为模板剂,正硅酸乙酯(TEOS)为硅源,在碱性条件下,用低温合成方法合成了有序介孔硅,并以此为硬模板,蔗糖为碳前驱体,采用液相浸渍方法填充碳源,制备出有序介孔碳.通过XRD、TEM、N2吸附-脱附等测试方法对其表征,结果表明合成的介孔材料高度有序,均具有很高的比表面积(介孔硅,992～1096 m2/g;介孔碳,930～1208 m2/g),较大的孔容和较窄的孔径分布.还发现随着反应温度的升高,介孔硅的结构从二维六方相(p6mm)转变为三维立方相(Ia3d);介孔碳在复制介孔硅后,其结构也从三维立方相(Ia3d)转变为四方相(I41/a),并对相转变机理做了初步探讨.
Mesoporous silica materials have been synthesized at low temperature under alkaline condition using tetraethyl orthosilicate as the silica source and cetyltrimethylammonium bromide as the structure di-recting agent.And the ordered mesoporous carbon was synthesized by liquid impregnation method with su-crose as the carbon precursor and mesoporous silica as template.The resulting materials were characterized by X-ray di？raction,transmission electron microscopy and N2 adsorption-desorption.The results show that the mesoporous materials have highly ordered structure,high specific surface area（mesoporous silica,992～1096 m2/g;mesoporous carbon,930～1208 m2/g）,large pore volume and narrow pore size distribution.In addition,with the rising of reaction temperature,the phase transformation of mesoporous silica from hex-agonal p6mm to cubic Ia3d was observed,and the structure of mesoporous carbon replicated from silica template transformed from cubic Ia3d to tetragonal I41/a.The preliminary discussion on phase transition was carried on.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2011年第2期226-230,共5页
Acta Chimica Sinica
基金
福建省自然科学基金(No.2008J0146)资助项目
关键词
介孔硅
介孔碳
相转变
mesoporous silica
mesoporous carbon
phase transition
