W/HZSM-5 catalyst for methane dehydroaromatization: a multinuclear MAS NMR study
文献类型：期刊论文
| 作者 | Yang, J; Deng, F; Zhang, MJ; Luo, Q; Ye, CH |
| 刊名 | JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
 |
| 出版日期 | 2003-08-01 |
| 卷号 | 202期号:1-2页码:239-246 |
| 关键词 | methane activation solid-state NMR W/HZSM-5 active metal phase bifunctional catalyst |
| 英文摘要 | Multinuclear solid-state NMR techniques were employed to investigate the interaction between tungsten species and zeolite in W/HZSM-5 catalysts prepared by controlled impregnation. Al-27, Si-29 NMR experiments suggest that introduction of W species leads to the formation of distorted four-coordinate framework and six-coordinate extra-framework aluminum species due to the interaction of the W species and framework aluminum, and the former can be further transformed into the latter, especially at high W loadings. H-1 MAS NMR indicates that some of the W species disperse on the external surface and some of them diffuse into the internal channels of the zeolite, which causes a decrease of the Bronsted acid sites and silanols as well as an increase of the extra-framework AI-OH species in the W/HZSM-5 catalysts. Cooperation of the W species and the remaining Bronsted acid sites is responsible for the activity of the W/HZAM-5 catalysts for methane dehydroaromatization. As revealed by C-13 NMR experiments, an induction period exists for methane dehydroaromatization reaction and W6+ oxide on/in the zeolite is likely to be converted into W4+ oxide during the reaction. It is W4+ oxide rather than carbide tungsten that acts as active metal sites for initial activation of methane on the W/HZSM-5 catalysts. (C) 2003 Elsevier Science B.V. All rights reserved. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Chemistry, Physical |
| 研究领域[WOS] | Chemistry |
| 关键词[WOS] | SOLID-STATE NMR ; H-1-AL-27 CROSS-POLARIZATION ; ULTRASTABLE ZEOLITE-Y ; ANGLE-SPINNING NMR ; LEWIS-ACID SITES ; DEHYDRO-AROMATIZATION ; HZSM-5 ZEOLITE ; AL-27 NMR ; NONOXIDATIVE CONDITIONS ; MO/HZSM-5 CATALYSTS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000184102800023 |
| 公开日期 | 2015-12-08 |
| 源URL | [http://ir.wipm.ac.cn/handle/112942/8937]  |
| 专题 | 武汉物理与数学研究所_2011年以前论文发表（包括2011年） |
| 作者单位 | Chinese Acad Sci, Wuhan Inst Phys & Math, State Key Lab Magnet Resonance & Atom & Mol Phys, Wuhan 430071, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yang, J,Deng, F,Zhang, MJ,et al. W/HZSM-5 catalyst for methane dehydroaromatization: a multinuclear MAS NMR study[J]. JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL,2003,202(1-2):239-246. |
| APA | Yang, J,Deng, F,Zhang, MJ,Luo, Q,&Ye, CH.(2003).W/HZSM-5 catalyst for methane dehydroaromatization: a multinuclear MAS NMR study.JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL,202(1-2),239-246. |
| MLA | Yang, J,et al."W/HZSM-5 catalyst for methane dehydroaromatization: a multinuclear MAS NMR study".JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL 202.1-2(2003):239-246. |
入库方式： OAI收割
来源：武汉物理与数学研究所
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