Abstract A novel Ni–Fe nanosheets catalyst supported on α-Al2O3 foam ceramic was synthesized by a hydrothermal method and used to obtain multi-walled carbon nanotubes (MWNTs) via the propane partial oxidation. Catalytic performance tests were carried out at 600 °C and atmospheric pressure using a fixed-bed reactor. The synthesized catalysts and carbon materials were analyzed using various characterization methods. According to the field emission scanning electron microscope (FESEM) results, the catalyst morphology was a 3D grid structure consisting of nanosheets 800 nm length and 80 nm width. Additionally, the quantity and quality of the carbon nanotubes were greatly influenced by different oxygen-to-propane molar ratios, defined as the equivalence ratio ϕ (ϕ = 1.5, 1.78, 2). Transmission electron microscope (TEM) images showed that carbon nanotubes over all catalysts were MWNTs. In addition, the thermogravimetric analysis and Raman data showed that a high yield of MWNTs was obtained at ϕ = 1.78, but the accumulated MWNTs at ϕ = 1.5 exhibited a higher degree of graphitization (ID/IG = 0.89) compared with the other two equivalence ratios.

中文翻译：

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多壁碳纳米管在 α-Al2O3 泡沫载体上的 Ni-Fe 纳米片上的大气压生长

摘要 采用水热法合成了一种负载在α-Al2O3泡沫陶瓷上的新型Ni-Fe纳米片催化剂，并通过丙烷部分氧化制备多壁碳纳米管（MWNTs）。使用固定床反应器在 600 °C 和大气压下进行催化性能测试。使用各种表征方法分析合成的催化剂和碳材料。根据场发射扫描电子显微镜 (FESEM) 结果，催化剂形态为 3D 网格结构，由 800 nm 长和 80 nm 宽的纳米片组成。此外，碳纳米管的数量和质量受不同氧与丙烷摩尔比的影响很大，定义为当量比 ϕ (ϕ = 1.5, 1.78, 2)。透射电子显微镜 (TEM) 图像显示所有催化剂上的碳纳米管都是 MWNT。此外，热重分析和拉曼数据表明，在 ϕ = 1.78 时获得了高产量的 MWNTs，但在 ϕ = 1.5 时积累的 MWNTs 表现出更高的石墨化程度（ID / IG = 0.89）与其他两个等价物相比比率。