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Templated synthesis of carbon materials mediated by porous clay heterostructures

机译:多孔粘土异质结构介导的碳材料模板合成

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摘要

Mesoporous carbon materials were prepared through template method approach using porous clay heterostructures (PCHs) as matrix and furfuryl alcohol as carbon precursor. Three PCHs prepared using amines with 8, 10 and 12 carbon atoms were used. The effect of several impregnation-polymerization cycles of the carbon precursor, the carbonization temperature and the need of a previous surface alumination were evaluated. The presence of two porosity domains was identified in all the carbon materials. These two domains comprise pores resulting from the carbonization of the polymer film formed in the inner structure of the PCH (domain I) and larger pores created by the clay particles aggregation (domain II). The predominance of the porosity associated to domain I or II can be achieved by choosing a specific amine to prepare the PCH matrix. Carbonization at 700 C led to the highest development of pores of domain I. In general, the second impregnation-polymerization cycle of furfuryl alcohol resulted in a small decrease of both types of porosity domains. Furthermore the previous acidification of the surface to create acidic sites proved to be unnecessary. The results showed the potential of PCHs as matrices to tailor the textural properties of carbons prepared by template mediated synthesis.
机译:采用多孔粘土异质结构(PCHs)为基质,糠醇为碳前驱体,通过模板法制备了介孔碳材料。使用了三个具有8、10和12个碳原子的胺制备的PCH。评估了碳前体的几个浸渍聚合循环的影响,碳化温度和先前表面铝化的需要。在所有碳材料中都确定存在两个孔隙域。这两个区域包括由在PCH的内部结构中形成的聚合物薄膜的碳化而产生的孔(区域I)和由粘土颗粒聚集形成的较大的孔(区域II)。可以通过选择特定的胺来制备PCH基质来实现与结构域I或II相关的孔隙度优势。 700 C的碳化导致I区孔的最大发展。通常,糠醇的第二次浸渍-聚合循环导致两种类型的孔隙区都有小幅下降。此外,事实证明,先前不需要酸化表面以形成酸性位点。结果表明,PCHs作为基质可以修饰通过模板介导的合成方法制备的碳的织构性质。

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