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题名: Formation of the V center on H-type zeolites with thermal treatment
作者: Qu, ZP;  Cheng, MJ;  Shi, C;  Huang, WX;  Zhang, WP;  Bao, XH
刊名: LANGMUIR
发表日期: 2002-02-19
DOI: 10.1021/la010987y
卷: 18, 期:4, 页:1200-1205
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Multidisciplinary ;  Chemistry, Physical ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Materials Science
英文摘要: The effect of thermal treatment on H-MCM-22 and H-ZSM-5 zeolites was investigated using the electron spin resonance technique. A six-line signal (denoted as A, g = 2.048, A = 22. 15 G) was detected on H-MCM-22 after He purging at high temperatures, whose intensities increased with the treating temperature. The same signal was also found on H-ZSM-5 zeolites with different crystal sizes. The paramagnetic center was identified as a V center, namely, a hole of an electron trapped on an oxygen atom bonding to a nearby aluminum atom. These signals appeared only on a dealuminated sample or a sample concomitantly with dealumination. The formation of the hole might involve an electron transferring from the lattice oxygen to a nonframework aluminum species, and the hyperfine splitting is caused by the interaction between the electron hole locating on the p orbit of oxygen and the framework aluminum bonding with the oxygen. The signal disappeared after the sample was exposed to air or oxygen at room temperature. However, the process was reversible. A new set of signals (denoted as B, g(1) = 2.008, g(2) = 2.003, g(3) = 1.9985) was observed after oxygen adsorption on the H-MCM-22 pretreated with He at 973 K or He purging at 973 K on the H-MCM-22 pretreated with oxygen at 813 K, which was attributed to the O- species.
关键词[WOS]: ELECTRON-SPIN-RESONANCE ;  H-1 MAS NMR ;  GAMMA-IRRADIATION ;  ACIDIC PROTONS ;  EPR ;  MORDENITE ;  MOBILITY ;  H-ZSM-5 ;  STATE
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000174009300038
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/84881
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:
Qu, ZP,Cheng, MJ,Shi, C,et al. Formation of the V center on H-type zeolites with thermal treatment[J]. LANGMUIR,2002,18(4):1200-1205.
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