Nb K- and L3-edges XAFS study on the structure of supported Nb carbide catalyst
Nb K- and L3-edges XAFS study on the structure of supported Nb carbide catalyst
复制标题
Nb K-和L3-边缘XAFS研究负载碳化铌催化剂的结构
DOI：
10.1088/1742-6596/712/1/012060
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
S. Shimazu
中科院分区：
文献类型：
--
作者：
N. Ichikuni;F. Yanagase;K. Mitsuhara;T. Hara;S. Shimazu
在密闭循环系统中，以CH 4-H2为还原气体，制备了介孔SiO2 SBA-15负载NbC催化剂。Nb的K边和L边XAFS测量结果表明，在SBA-15载体上形成了小的NbC团簇，延长渗碳保温时间可使碳化过程逐渐进行。利用Nb L3边XANES谱的阈能位移解释了Nb物种的渗碳程度。
Mesoporous silica SBA-15 supported NbC catalysts were prepared under reduced pressure of CH 4-H 2 gas in a closed circulating system. Nb K-and L 3-edges XAFS measurements revealed that small NbC cluster formed on SBA-15 support and gradual carburization process by lengthening the carburization temperature-maintaining period. Carburization degree of Nb species was clearly explained by using threshold energy shift of Nb L 3-edge XANES profile.