Hierarchical porous carbons by liquid phase impregnation of zeolite templates with lignin solution
Hierarchical porous carbons by liquid phase impregnation of zeolite templates with lignin solution
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DOI：
10.1016/j.micromeso.2014.04.055
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发表时间：
2014-09
影响因子：
5.2
通讯作者：
M. J. Valero-Romero;E. M. Márquez-Franco;J. Bedia;J. Rodríguez-Mirasol;T. Cordero
中科院分区：
文献类型：
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作者：
M. J. Valero-Romero;E. M. Márquez-Franco;J. Bedia;J. Rodríguez-Mirasol;T. Cordero
以Alcell木质素溶液为碳前驱体，通过液相浸渍不同分子筛模板剂，制备了具有多级孔结构的模板碳材料。分析了合成条件如模板混合物（木质素/沸石）、碳化温度（500、700和900 °C）和沸石骨架对所得碳的结构和化学性质的影响。这项工作的主要原创方面是使用Alcell木质素作为碳前体，一种来自造纸工业的低成本副产品，以获得具有不同孔径分布的多孔碳材料，这取决于所使用的无机模板。微孔性是从硬模板的复制和木质素的碳化发展而来的，而中孔性可以通过适当选择硬模板和渗透条件来调节。TC呈现出有趣的表面化学特征，具有相对高量的氮和氧稳定的表面基团，例如分别为吡咯和吡啶以及羟基和羰基类型，其似乎在合成期间已经从沸石模板的表面氨离子和氧转移到碳材料。羟基基团似乎是TC的相对高的布朗斯台德酸度的原因。
Templated carbon materials (TCs) with hierarchical pore structure were obtained by liquid phase impregnation of different zeolite templates using Alcell lignin solutions as carbon precursor. The effect of synthesis conditions such as templating mixture (lignin/zeolite), carbonization temperature (500, 700 and 900 °C) and of zeolite framework on the structural and chemical properties of the resultant carbons was analyzed. The main original aspect of this work is the use of Alcell lignin as carbon precursor, a low-cost co-product derived from the papermaking industry, to obtain porous carbon materials with different pore size distribution, depending on the inorganic template used. Microporosity is developed from both the replication of the hard template and the carbonization of lignin, whereas mesoporosity can be adjusted by and adequate selection of the hard template and infiltration conditions. The TCs present interesting surface chemistry features, with a relatively high amount of nitrogen and oxygen stable surface groups, such as pyrrolic and pyridinic and hydroxyl and carbonyl type, respectively, which seem to have been transferred from the surface ammonia ions and oxygen of the zeolite template to the carbon materials during the synthesis. The hydroxyl groups seem to be responsible of the relatively high Brönsted acidity of the TCs.