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题名: Coke formation during the methanol conversion to olefins in zeolites studied by UV Raman spectroscopy
作者: Li, J;  Xiong, G;  Feng, Z;  Liu, Z;  Xin, Q;  Li, C
关键词: coke formation ;  UV Raman spectroscopy ;  methanol conversion ;  SAPO-34 ;  zeolites
刊名: MICROPOROUS AND MESOPOROUS MATERIALS
发表日期: 2000-09-01
卷: 39, 期:1-2, 页:275-280
收录类别: SCI
文章类型: Article
部门归属: 5
项目归属: 503
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Applied ;  Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science
英文摘要: Coke formation on/in ZSM-5, USY and SAPO-34 zeolites was investigated during the methanol conversion to olefins at temperatures from 298 to 773 K using ultraviolet (UV) Raman spectroscopy. The fluorescence interference that usually obscures the Raman spectra of zeolites in the conventional Raman spectroscopy, particularly for coked catalysts, can be successfully avoided in the UV Raman spectroscopy. Raman spectra are almost the same for adsorbed methanol on the three zeolites at room temperature. However, the Raman spectra of the surface species formed at elevated temperatures are quite different for the three zeolites. Coke species formed in/on SAPO-34 are mainly polyolefinic species, and in/on ZSM-5 are some aromatic species, but polyaromatic or substituted aromatic species are predominant in USY at high temperatures. Most of the coke species can be removed after a treatment with O-2 at 773 K, while some small amount of coke species always remains in these zeolites, particularly for USY. The main reason for the different behavior of coke formation in the three zeolites could be attributed to the different pore structures of the zeolites. (C) 2000 Elsevier Science B.V. All rights reserved.
关键词[WOS]: PARAMAGNETIC-RES MEASUREMENTS ;  HYDROGEN MORDENITE ;  HYDROCARBONS ;  CATALYSTS ;  ADSORPTION ;  MECHANISM ;  H-ZSM-5 ;  NMR
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000089361000027
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/91441
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:
Li, J,Xiong, G,Feng, Z,et al. Coke formation during the methanol conversion to olefins in zeolites studied by UV Raman spectroscopy[J]. MICROPOROUS AND MESOPOROUS MATERIALS,2000,39(1-2):275-280.
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