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利用γ-氧化铝为模板,精细控制合成了一系列具有不同孔径的中孔碳材料.在优化的条件下,所得的碳材料具有孔径分布窄、比表面积高(>1000m2·g-1)、孔容大(最高3.82cm3·g-1)、中孔率高(>99%)的特点,并且孔壁厚度仅有1-2个石墨层.选用了三种不同来源的氧化铝为模板,考察了模板与所得碳材料织构的相关性,并提出用无序模板可控制备碳材料的机理.即在碳包覆氧化铝的复合物前体中,若碳层完整覆盖氧化铝表面并且足够强韧,则所得碳材料可近似复制模板的孔结构,并且碳材料的孔一部分由去除模板所生成,另一部分来源于模板原有的孔.据此模型对所得碳材料的孔容进行了理论计算,其结果有力支持了上述机理.
A series of mesoporous carbon materials with different pore sizes were finely controlled by using γ-alumina as a template. Under optimized conditions, the resulting carbon materials have narrow pore size distribution and high specific surface area (> 1000m2 · g-1) The pore volume is large (up to 3.82cm3 · g-1) and the mesopore rate is high (> 99%), and the pore wall thickness is only 1-2 layers of graphite.Among the three different sources of alumina as the template, The relationship between the template and the textures of the obtained carbon materials was investigated and the mechanism of controlled preparation of the carbon-forming materials by using the disordered templates was proposed. That is, in the carbon-coated alumina precursor, if the carbon layer completely covers the surface of the alumina and Strong enough, the resulting carbon material can reproduce the pore structure of the template approximately, and part of the pores of the carbon material are formed by removing the template and the other part is derived from the original pores of the template, whereby the pore volume of the obtained carbon material is subjected to the model Theoretical calculations, the results strongly support the above mechanism.