Preparation of supported NbC catalysts from peroxoniobic acid and in situ XAFS characterization

Preparation of supported NbC catalysts from peroxoniobic acid and in situ XAFS characterization
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DOI：
10.1016/j.apcata.2008.03.021
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发表时间：
2008-07
期刊：
Applied Catalysis A-general
影响因子：
5.5
通讯作者：
S. Kodama;N. Ichikuni;K. Bando;Takayoshi Hara;S. Shimazu
S. Kodama;N. Ichikuni;K. Bando;Takayoshi Hara;S. Shimazu
中科院分区：
化学2区
文献类型：
--
作者：
S. Kodama;N. Ichikuni;K. Bando;Takayoshi Hara;S. Shimazu

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以过氧铌酸（PNA）为原料制备了Nb/ al2o3和Nb/SiO2as碳化铌前驱体。采用程序升温反应（TPR）方法，在ch4 - h2o2混合气体通道下制备了氧化铝负载的碳化铌和二氧化硅负载的碳化铌。用x射线吸收精细结构（XAFS）和拉曼光谱对两种催化剂进行了表征。Nb/ al2o3的渗碳效率高于Nb/SiO2。碳沉积在NbC上发生在Nb种渗碳完成后。
Nb/Al2O3and Nb/SiO2as niobium carbide precursors were prepared from peroxoniobic acid (PNA). Alumina-supported niobium carbide and silica-supported niobium carbide were prepared by temperature programmed reaction (TPR) method under CH4–H2mixed gas passage. Both catalysts were characterized by X-ray absorption fine structure (XAFS) and Raman spectroscopy. Nb/Al2O3was more efficiently carburized than Nb/SiO2. The carbon deposition onto NbC occurred after the carburization completion of the Nb species.