PREPARATION AND CHARACTERIZATION OF A NOVEL CLASS OF CATALYSTS : ULTRADISPERSED MOLYBDENUM OXYNITRIDES SUPPORTED ON NAEMT AND HEMT ZEOLITE
PREPARATION AND CHARACTERIZATION OF A NOVEL CLASS OF CATALYSTS : ULTRADISPERSED MOLYBDENUM OXYNITRIDES SUPPORTED ON NAEMT AND HEMT ZEOLITE
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DOI：
10.1021/jp9622492
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发表时间：
1997-08
影响因子：
3.3
通讯作者：
T. Bécue;J. Manoli;C. Potvin;G. Djéga-Mariadassou;M. Delamar
中科院分区：
文献类型：
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作者：
T. Bécue;J. Manoli;C. Potvin;G. Djéga-Mariadassou;M. Delamar
将Mo(CO)6/EMT在氨分压下分解，然后在流动氨下进行氮化处理，制备EMT沸石包覆的氮化钼簇。HRTEM和EDS分析表明，最终的钼相分布均匀，最终团簇直径小于10 A。x射线衍射（XRD）和比表面积测量结果表明，氨处理对EMT沸石结晶度没有影响。制备过程中的氨分解和x射线光电子能谱（XPS）数据使我们能够在低至723 K的氮化温度下评估簇的氮化性质。
Decomposition under partial pressure of ammonia of Mo(CO)6/EMT and subsequent nitridation under flowing ammonia were used to prepare EMT zeolite-encaged molybdenum nitride clusters. The HRTEM and EDS measurements indicate that the final molybdenum phases were homogeneously dispersed, the final clusters' diameter being less than 10 A. X-ray diffraction (XRD) patterns and specific surface area measurements showed that the EMT zeolite crystallinity was not affected by ammonia treatments. Ammonia decomposition during the preparation step and X-ray photoelectron spectroscopy (XPS) data allowed us to assess the nitridic nature of the clusters for a nitridation temperature as low as 723 K.