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MCM-41负载氧氮化钼的制备和表征
作者:李正平 高濂 
单位:中国科学院上海硅酸盐研究所 高性能陶瓷和超微结构国家重点实验室 中国科学院上海硅酸盐研究所 高性能陶瓷和超微结构国家重点实验室 上海200050  上海200050 
关键词:氧氮化钼  X射线光电子能谱 
分类号:TQ426
出版年,卷(期):页码:2003,31(7):650-653
DOI:
摘要:
将MoO3和介孔材料MCM 41的机械混合物热处理得到MoO3/MCM 41复合体 ,将MoO3/MCM 41在氨气氛中于 70 0℃氮化处理 3h ,制备了氧氮化钼负载的MCM 41催化材料。用XRD ,XPS和氮吸附脱附等手段表征了该材料。结果表明 :在XRD图谱中出现氧氮化钼的微弱衍射峰 ,证明通过这种方法得到的材料中的氧氮化钼呈现结晶趋势。XPS谱表明 :Mo存在多种化学状态。氧氮化钼负载的MCM41的比表面积 ,孔体积和孔径等参数小于MoO3/MCM 41和纯MCM 41的值
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MCM41 supported molybdenum oxynitrides catalyst was prepared by nitriding MoO 3/MCM41 under NH 3 atmosphere at 700 ℃ for 3 h, in which process MoO 3/MCM41 was prepared via thermal spreading the mechanical mixture of MoO 3 and MCM41. XRD, XPS and N 2 adsorption desorption isotherms were used to characterize the material obtained. The results show that the molybdenum oxynitrides species in the materials appear to be crystallized, which proofed from the corresponding XRD peaks. The XPS result reveals that there are three chemical states for molybdenum in the catalyst, i.e., Mo(Ⅵ), Mo(Ⅴ) and Mo(Ⅳ). The BET surface area, pore volume and pore diameter of the catalyst are smaller than those of MoO 3/MCM41and pure MCM41 after the nitriding process.
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参考文献:
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