Zeolite surface as a catalyst support material for synthesis of single-walled carbon nanotubes
Zeolite surface as a catalyst support material for synthesis of single-walled carbon nanotubes
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DOI：
10.1021/jp207930m
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发表时间：
2011-11
影响因子：
3.7
通讯作者：
Takahiko Moteki;Y. Murakami;S. Noda;S. Maruyama;T. Okubo
中科院分区：
文献类型：
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作者：
Takahiko Moteki;Y. Murakami;S. Noda;S. Maruyama;T. Okubo
通过控制催化剂和催化剂载体材料等参数，研究了单壁碳纳米管的制备方法。虽然沸石经常被用作合成纳米碳管的催化剂载体材料，但以前使用的沸石的详细表面性质及其作为催化剂载体材料的作用尚未得到充分阐明。本研究以硅质mfi型沸石硅石-1的清洁b平面表面为模型底物，制备了单壁碳纳米管。用于生成SWNT的活性钴的量比最初溅射的量要少，XPS测量显示钴扩散到沸石骨架中。发现扩散的钴与沸石的硅骨架有强烈的相互作用。钴在硅石-1沸石中的扩散系数大于在Si衬底上形成的热氧化SiO2中的扩散系数。这种差异归因于微孔……
Preparation of single-walled carbon nanotubes (SWNTs) has been advanced by controlling several parameters including the catalyst and the catalyst support material. Although zeolite has been frequently used as a catalyst support material for the synthesis of SWNTs, detailed surface properties of previously employed zeolites and thus their role as a catalyst support material have not been sufficiently clarified yet. In this study, a clean b-plane surface of silicalite-1, which is a siliceous MFI-type zeolite, was used as a model substrate for the synthesis of SWNTs. The amount of active cobalt used for SWNT generation was smaller than the initially sputtered amount, and XPS measurements revealed diffusion of cobalt into the zeolite framework. The diffused cobalt was found to interact strongly with the silica framework of zeolite. The diffusion coefficient of cobalt in silicalite-1 zeolite was larger than that in thermally oxidized SiO2 formed on a Si substrate. This difference was ascribed to the microporou...