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题名: Study on the induction period of methane aromatization over Mo/HZSM-5: partial reduction of Mo species and formation of carbonaceous deposit
作者: Jiang, H;  Wang, LS;  Cui, W;  Xu, YD
关键词: methane aromatization ;  induction period ;  Mo species ;  partial reduction ;  carbonaceous deposit
刊名: CATALYSIS LETTERS
发表日期: 1999
卷: 57, 期:3, 页:95-102
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: The induction period of dehydrogenation and aromatization of methane over Mo/HZSM-5 was studied by combining a pulse reaction method with TPSR, UV laser Raman, and C-13 CPMAS NMR techniques. BET and XRD results showed that Mo species were well dispersed on/in the zeolite. TPSR in CH4 stream revealed that Mo species were reduced in at least two different stages before the formation of benzene. TPR results were in agreement with TPSR results. The two stages might be attributed to the reduction of two kinds of Mo6+ species to low valence Mo species. One was polymolybdate MoO3, and the other was crystalline MoO3. UV Raman spectra showed the existence of octahedrally coordinated polymolybdate species. XRD, however, did not detect any crystalline MoO3, possibly because they were too small to be detected with this technique. Pulse reaction results indicated that pre-reduction of the catalyst and formation of carbonaceous deposit could shorten the induction period. It is concluded that the formation of active sites during the induction period via partial reduction of Mo6+ species and formation of carbonaceous deposit on partially reduced Mo species is of significance for methane aromatization over Mo/HZSM-5.
关键词[WOS]: SUPPORTED MOLYBDENUM OXIDE ;  CATALYSTS ;  BENZENE ;  DEHYDROGENATION ;  ACTIVATION ;  CONVERSION ;  TRANSFORMATION ;  AROMATICS ;  MO/ZSM-5 ;  OXIDANTS
语种: 英语
WOS记录号: WOS:000078796000002
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138640
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.Acad Sinica, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Jiang, H,Wang, LS,Cui, W,et al. Study on the induction period of methane aromatization over Mo/HZSM-5: partial reduction of Mo species and formation of carbonaceous deposit[J]. CATALYSIS LETTERS,1999,57(3):95-102.
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