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首页> 外文会议>3rd International Mesostructured Materials Symposium Jul 8-11, 2002 Jeju, Korea >Surface and pore structures of CMK-5 ordered mesoporous carbons studied by nitrogen adsorption and surface spectroscopic methods
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Surface and pore structures of CMK-5 ordered mesoporous carbons studied by nitrogen adsorption and surface spectroscopic methods

机译：氮吸附和表面光谱法研究CMK-5有序介孔碳的表面和孔结构

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摘要

Porous carbons are widely used as absorbents and catalyst supports. In many applications, carbons with mesopores of defined dimensions are desirable. By synthesis in a suitable matrix, ordered mesoporous carbons (OMCs) can be produced in a convenient way. In the present work, OMCs were synthesised by polymerisation of furfuryl alcohol in SBA-15 aluminosilicates with different Si/Al ratios. The polymerisation of furfuryl alcohol is normally acid catalysed. The addition of an acid catalyst is required when the synthesis is performed in non-acidic silica. However, this is unnecessary if performed in an acidic aluminosilicate as in the present work. The polymerisation reaction is catalysed by the Bronsted acid sites of the matrix. The introduction of aluminium not only influences the acidity of the matrix, it may also affect its pore structure. Therefore, in the present work, the matrices used for the OMC synthesis were characterised by nitrogen adsorption. The OMCs were studied by X-ray photoelectron spectroscopy (XPS) and by nitrogen adsorption. By XPS, only information on the external surface is obtained. However, it was shown in previous studies on similar OMCs that the surface spectroscopic results are representative for the entire sample.
机译：多孔碳被广泛用作吸收剂和催化剂载体。在许多应用中，具有定义尺寸的中孔的碳是合乎需要的。通过在合适的基质中合成，可以方便的方式生产有序介孔碳（OMC）。在目前的工作中，OMC是通过糠醇在具有不同Si / Al比的SBA-15铝硅酸盐中聚合而合成的。糠醇的聚合通常是酸催化的。当在非酸性二氧化硅中进行合成时，需要添加酸性催化剂。但是，如本发明所述，如果在酸性铝硅酸盐中进行则没有必要。聚合反应由基质的布朗斯台德酸位点催化。铝的引入不仅影响基质的酸度，还可能影响其孔结构。因此，在本工作中，用于OMC合成的基质的特征是氮吸附。通过X射线光电子能谱（XPS）和氮吸附研究了OMC。通过XPS，仅获得外表面上的信息。但是，先前在类似OMC上的研究表明，表面光谱结果可代表整个样品。

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