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首页> 外文期刊>Applied Surface Science >Effect Of Temperature On The Kinetics Of Acetylene Decomposition Over Reduced Iron Oxide Catalyst For The Production Of Carbon Nanotubes
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Effect Of Temperature On The Kinetics Of Acetylene Decomposition Over Reduced Iron Oxide Catalyst For The Production Of Carbon Nanotubes

机译：温度对生产碳纳米管的还原氧化铁催化剂上乙炔分解动力学的影响

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摘要

Carbon nanotubes (CNTs) were synthesized by the catalytic decomposition of acetylene over nanosized metallic iron. A high metal loading was chosen in order to obtain a longer catalytic activity. Different nanosized iron oxides were prepared using chemical methods. A catalyst of the composition 40% Fe_2O_3:60% Al_2O_3 is prepared by wet impregnation method. The prepared samples of iron oxides supported in alumina were completely reduced by hydrogen gas at 500℃ and then constant rate of acetylene gas was passed over the freshly reduced samples at different reaction conditions. The kinetics of CNTs synthesis on reduced nanosized Fe_2O_3 supported on alumina was investigated as a function of crystal size of iron oxide catalyst (35-150 nm) and decomposition temperature (400-700℃). The microstructure and morphology of the synthesized catalyst and CNTs were characterized using scanning electron microscope (SEM), high-resolution transmission electron microscope (HR-TEM) and XRD analysis. The results revealed that both the crystal size of iron oxide and decomposition temperature have a significant effect on the percentage yield of carbon deposited. It increased by decreasing crystal size of the catalyst and increasing decomposition temperature to certain limit. The maximum yield of carbon deposited (426%) was obtained at decomposition temperature 600℃ and over nanosized iron oxide catalyst with crystal size of average 35 nm.
机译：碳纳米管（CNTs）是通过乙炔在纳米级金属铁上的催化分解而合成的。选择较高的金属负载量以获得更长的催化活性。使用化学方法制备了不同的纳米级氧化铁。通过湿浸渍法制备组成为40％Fe_2O_3∶60％Al_2O_3的催化剂。制备的氧化铝中负载的氧化铁样品在500℃下用氢气完全还原，然后在不同的反应条件下，恒定速率的乙炔气通过新鲜还原的样品。研究了在氧化铝上负载的还原型纳米Fe_2O_3上CNTs的合成动力学与氧化铁催化剂的晶体尺寸（35-150 nm）和分解温度（400-700℃）的关系。利用扫描电子显微镜（SEM），高分辨率透射电子显微镜（HR-TEM）和XRD分析对合成的催化剂和碳纳米管的微观结构和形貌进行表征。结果表明，氧化铁的晶体尺寸和分解温度均对沉积碳的百分产率有显着影响。它通过减小催化剂的晶体尺寸和将分解温度提高到一定极限而增加。在分解温度为600℃和平均粒径为35 nm的纳米氧化铁催化剂上，可获得最大的碳沉积率（426％）。

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