以甲烷为碳源,316号不锈钢网为催化剂,800℃下催化裂解甲烷,采用化学气相沉积法制备平均粒径为70~100 nm纳米洋葱碳,通过酸洗-低温煅烧-磁选方法对洋葱碳进行纯化处理。 X射线衍射、扫描电子显微镜、透射电子显微镜、红外吸收光谱、拉曼光谱和振动样品磁强计对样品的形貌结构、物相组成及磁性能进行表征分析。结果表明,酸洗-低温煅烧能有效去除初产物中裸露的催化剂颗粒及无定型碳,磁选则实现将内包有[ Fe-Ni]磁性催化剂的洋葱碳与空心的洋葱碳分离,最终获得纯净的空心纳米洋葱碳。
Carbon nano onions ( CNOs) with diameters of 70-100 nm were fabricated by chemical vapor deposition at 800 ℃, using methane as carbon source and high-temperature steam treated 316 stainless steel mesh as catalyst. The CNOs were isolated from the substrate by HNO3 refluxing, calcination in air at 500 ℃ and magnetic separation. The morphology, microstructures and magnetic properties of the CNOs were characterized by SEM, TEM, XRD, Raman spectroscopy, FT-IR spectroscopy and vibration sample magnetometer tests. Results showed that the surface-attached catalyst particles and amorphous carbon can be effectively re-moved from raw CNOs through HNO3-refluxing and calcination. Magnetic separation can selectively remove the CNOs encapsula-ting a [ Ni,Fe] magnetic catalyst from the CNOs that are hollow.
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