Fitting the porosity of carbon xerogel by CO2 activation to improve the TMP/n-octane separation
Fitting the porosity of carbon xerogel by CO2 activation to improve the TMP/n-octane separation
复制标题
通过 CO2 活化拟合碳干凝胶的孔隙率以改善 TMP/正辛烷分离
DOI：
10.1016/j.micromeso.2015.01.010
复制
发表时间：
2015
影响因子：
5.2
通讯作者：
F. J. Maldonado
中科院分区：
文献类型：
--
作者：
J. F. Vivo;F. Carrasco;A. Pérez;F. J. Maldonado
间苯二酚-甲醛干凝胶的酸催化合成最终（在碳化之后）成为具有作为碳分子筛（CMS）的潜在用途的微孔碳材料。采用CO2活化的方法对炭干凝胶的微孔结构进行了改性。由于直链和支链烷烃的分离具有工业相关性，因此测试了2，2 ′，4-三甲基戊烷（TMP）和正辛烷的动态吸附，以将不同样品的结构性质与其吸附行为联系起来。由于TMP（衍生）比正辛烷（线性）体积大，因此具有细微孔的碳干凝胶（具有低活化度）无法保留该化合物。随着烧除程度的增加，孔宽的增大有利于TMP的吸附，但同时，正辛烷的吸附量也随着孔体积的增大而增加。因此，我们进行了竞争吸附实验，以分析我们的样品的分离性能。正如预期的那样，粒度越小，分离结果越好。因此，需要折衷以优化CMS或吸附行为。
Acid catalyzed synthesis of resorcinol-formaldehyde xerogels ends up (after carbonization) into microporous carbon materials with potential use as Carbon Molecular Sieves (CMS). CO2activation was performed in order to modify the microporosity of the carbon xerogel. As separation of linear and branched paraffins presents an industrial relevance, 2,2′,4-trymethylpentane (TMP) and n-octane dynamic adsorption was tested in order to relate textural properties of different samples with their adsorptive behaviour. Since TMP (ramified) is bulkier than n-octane (linear), carbon xerogels with slim micropores (with low activation degree) were unable to retain this compound. Increasing the burn-off degree, adsorption of TMP is favoured by the pore width increase, but simultaneously, n-octane adsorption also increased by the development of the micropore volume. So that, competitive adsorption experiment were carried out in order to analyze the separation performance of our samples. As expected, the smaller the micropore size, the better the separation results. Therefore, a compromise is needed in order to optimize the CMS or adsorptive behaviour.