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首页> 外文期刊>Journal of Materials Science >Confined palladium colloids in mesoporous frameworks for carbon nanotube growth
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Confined palladium colloids in mesoporous frameworks for carbon nanotube growth

机译：介孔骨架中的受限钯胶体用于碳纳米管生长

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Palladium colloidal nanoparticles with an average size of approximately 2.4 nm have been incorporated into mesoporous inorganic thin films following a multistep approach. This involves the deposition of mesoporous titania thin films with a thickness of 200 nm by spin-coating on titanium plates with a superhydrophilic titania outer layer and activation by calcination in a vacuum furnace at 573 K. Nanoparticles have been confined within the porous titania network by dip-coating noble metal suspensions onto these mesoporous thin films. Finally, the resulting nanoconfined systems were used as substrates for the growth of oriented carbon nanotubes (CNTs) using plasma-enhanced chemical vapour deposition at 923 K in order to enhance their surface area. These CNTs were tested in the hydrogenation of phenylacetylene by hydrogen in a batch reactor. The initial reaction rate observed on a CNT/TiO2 structured catalyst was considerably higher than that on 1 wt% Pd/TiO2 thin films.
机译：按照多步骤方法，将平均粒径约为2.4 nm的钯胶体纳米颗粒掺入到中孔无机薄膜中。这包括通过旋涂在具有超亲水性二氧化钛外层的钛板上并通过在573 K的真空炉中煅烧活化来沉积厚度为200 nm的中孔二氧化钛薄膜。纳米粒子被限制在多孔二氧化钛网络内将贵金属悬浮液浸涂在这些中孔薄膜上。最后，将所得的纳米受限系统用作衬底，用于通过在923 K上进行等离子体增强的化学气相沉积来生长定向碳纳米管（CNT），以增加其表面积。在分批反应器中通过氢气在苯乙炔加氢中测试了这些CNT。碳纳米管/ TiO 2 结构催化剂的初始反应速率明显高于1重量％的Pd / TiO 2 薄膜。

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