Hierarchical micro-mesoporous carbons by direct replication of bimodal aluminosilicate templates
Hierarchical micro-mesoporous carbons by direct replication of bimodal aluminosilicate templates
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DOI：
10.1016/j.micromeso.2014.02.008
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发表时间：
2014-05
影响因子：
5.2
通讯作者：
M. Enterría;F. Suárez-García;A. Martínez-Alonso;J. Tascón
中科院分区：
文献类型：
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作者：
M. Enterría;F. Suárez-García;A. Martínez-Alonso;J. Tascón
这项工作的目的是生产具有可控的双峰孔隙率在微孔-中孔范围内的碳。以双峰Y型分子筛核/MCM-48硅壳铝硅酸盐为模板剂，采用直接复制法制备了多级微孔-介孔炭。不同的变量的化学气相沉积（CVD）过程进行了研究，以实现一个合适的渗透的中孔和微孔的模板。因此，进行了用乙炔的一步浸渗以及用乙炔和丙烯的两步浸渗，以进一步研究前体和CVD步骤持续时间的影响。一步乙炔CVD给出了最好的结果，因为所获得的碳表现出1000-1323 m2/g的高比表面积，并且它们的X射线衍射和透射电子显微镜分析表明，它们忠实地复制了母体模板的分级核-壳结构。当丙烯用作碳源时，实现了中孔壳的更好的复制，但作为对比，微孔核的复制失败。
The objective of this work was to produce carbons with controllable bimodal porosity in the micro-mesopore range. Hierarchical micro-mesoporous carbons were prepared by direct replication, using bimodal Y zeolite core/MCM-48 silica shell aluminosilicates as templates. Different variables of the chemical vapor deposition (CVD) process were studied in order to achieve a suitable infiltration of both meso and micropores of the templates. Thus, one-step infiltration with acetylene and also two-step infiltration with acetylene and propylene were performed to further investigate the effect of the precursor and CVD steps duration. One-step acetylene CVD gave the best results since the obtained carbons exhibited high specific surfaces areas of 1000–1323 m2/g, and their X-ray diffraction and transmission electron microscopy analysis revealed that they faithfully replicated the hierarchical core–shell structure of the parent template. When propylene was used as carbon source a better replication of the mesoporous shell was achieved, but as a counterpoint, the replication of the microporous core failed.