Densification of ordered microporous carbons and controlling their micropore size by hot-pressing
Densification of ordered microporous carbons and controlling their micropore size by hot-pressing
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DOI：
10.1016/j.carbon.2007.05.029
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发表时间：
2007-09
期刊：
影响因子：
10.9
通讯作者：
P. Hou;H. Orikasa;Hiroyuki Itoi;H. Nishihara;T. Kyotani
中科院分区：
文献类型：
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作者：
P. Hou;H. Orikasa;Hiroyuki Itoi;H. Nishihara;T. Kyotani
以Y沸石为原料，采用模板法合成了有序微孔碳，并在573K下进行了高达147 Mpa的热压，以期实现模板碳的致密化，为以后的储能材料的应用奠定基础。热压后的粉状模板炭在没有任何粘结剂的情况下易于造粒，堆积密度从0.2g/cm~3显著提高到0.7~0.9g/cm~3。结果表明，单位体积的比表面积和微孔体积都有所增加。令人惊讶的是，发现热压处理减小了平均微孔尺寸，并且可以通过简单地调整处理中的压力来调节。相反，商业KOH活性碳在相同条件下热压时，密度和孔结构没有观察到这样的变化。观察到的模板碳在热压过程中的特殊行为可以用其独特的分子结构来解释，与传统的活性碳相比。
Ordered microporous carbons synthesized by the template method using zeolite Y were hot-pressed at 573K up to 147MPa, aiming at densification of the templated carbons for the future use as energy storage media. Upon the hot-pressing, the powdery templated carbons were easily pelletized without any binder and the bulk density was significantly increased from 0.2g/cm3to 0.7–0.9g/cm3. As a result, both the surface area and micropore volume per unit volume were increased. Surprisingly, it was found that the hot-pressing treatment reduced the average micropore size and it was tunable by simply adjusting a pressure in the treatment. In contrast, such changes in the density and the pore structure were not observed for commercial KOH-activated carbons when they were hot-pressed under the same conditions. The observed peculiar behavior of the templated carbons upon the hot-pressing can be explained by their unique molecular structure as compared to the conventional activated carbons.