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题名: Effect of oxygen on aromatization of methane over Mo/HZSM-5 zeolite
作者: Yuan, SD;  Feng, ZC;  Ying, PL;  Li, C
关键词: laser induced fluorescence spectroscopy ;  molybdenum ;  HZSM-5 zeolite ;  methane ;  aromatization
刊名: CHINESE JOURNAL OF CATALYSIS
发表日期: 2002-03-01
卷: 23, 期:2, 页:150-152
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Applied ;  Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: The effect of oxygen on aromatization of methane over Mo/HZSM-5 zeolite was studied. It was found that there exists a threshold value of the oxygen concentration. The durability of Mo/HZSM-5 zeolite in aromatization of methane is greatly improved by the added oxygen when the oxygen concentration is lower than the threshold value; otherwise, the total oxidation of methane takes place. The Mo/HZSM-5 samples after aromatization of methane in the presence of oxygen was characterized by UV-Raman spectroscopy and laser induced fluorescence spectroscopy (LIFS). It was disclosed that the amount of coke, the carburization degree of molybdenum species and the wavelength of a band at 520 similar to 580 nm in the LIFS of Mo/HZSM-5 zeolite decrease monotenously with the rising of oxygen concentration. It was suggested that the variation of the LIFS band with the oxygen concentration originates from the difference in the caburization degree of molybdenum species. The band at similar to580 nm in LIFS is tentatively assigned to MoOxCy/HZSM-5 and the band at 520 nm to MoO3/HZSM-5. So MoOxCy/HZSM-5 can be suggested to be the active phase for aromatization of methane over Mo/HZSM-5 in the presence of oxygen.
语种: 英语
WOS记录号: WOS:000175026000016
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139146
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Yuan, SD,Feng, ZC,Ying, PL,et al. Effect of oxygen on aromatization of methane over Mo/HZSM-5 zeolite[J]. CHINESE JOURNAL OF CATALYSIS,2002,23(2):150-152.
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