Solid-state chemistry route for supported tungsten and tungsten carbide nanoparticles
Solid-state chemistry route for supported tungsten and tungsten carbide nanoparticles
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DOI：
10.1016/j.jssc.2012.07.027
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发表时间：
2012-10
影响因子：
3.3
通讯作者：
N. Hugot;A. Desforges;S. Fontana;J. Marêché;C. Hérold;A. Albiniak;G. Furdin
中科院分区：
文献类型：
--
作者：
N. Hugot;A. Desforges;S. Fontana;J. Marêché;C. Hérold;A. Albiniak;G. Furdin
使用固态化学方法制备了钨和碳化钨纳米颗粒。在碳载体上气相浸渍六氯化钨前体后，进行程序升温还原/渗碳。研究了几个参数，并通过 XRD 和 TEM 跟踪所得样品的演变。反应参数的优化使得制备的W、W2C和WC颗粒良好地分散在载体上。然而，不能单独获得平均尺寸小于10nm的WC相。这可以通过渗碳机制和载体上的碳扩散来解释。
Nanoparticles of tungsten and tungsten carbide have been prepared using solid-state chemistry methods. After the vapor phase impregnation of a tungsten hexachloride precursor on a carbon support, a temperature-programmed reduction/carburization was performed. Several parameters were investigated and the evolution of obtained samples was followed by XRD and TEM. The optimization of the reaction parameters led to the preparation of W, W2C and WC particles well dispersed on the support. WC phase however could not be obtained alone with less than 10nm mean size. This could be explained by the carburization mechanism and the carbon diffusion on the support.