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题名: Effect of extra-framework gallium on the structure of iron species in Fe/ZSM-5
作者: Xia, Haian1, 2;  Sun, Keqiang1;  Fan, Fengtao1, 2;  Sun, Keju1, 2;  Su, Weiguang1, 2;  Feng, Zhaochi1;  Ying, Pinliang1;  Li, Can1
关键词: Raman spectroscopy ;  N2O decomposition ;  Transient response ;  Extra-framework Ga ;  Isolated ;  Bi-nuclear ;  Oligo-nuclear
刊名: JOURNAL OF CATALYSIS
发表日期: 2008-10-25
DOI: 10.1016/j.jcat.2008.09.001
卷: 259, 期:2, 页:269-275
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: A series of Fe/Ga-ZSM-5 catalysts with different Ga contents were prepared by solid-state ion exchange method. Ultraviolet and visible Raman spectroscopy, ultraviolet-visible diffuse reflectance spectroscopy, H-2-temperature-programmed reduction, and N2O decomposition at 523 K were used to investigate the effect of extra-framework Ga on the nature of the Fe species in Fe/Ga-ZSM-5 catalysts. Introducing extra-framework Ga and high-temperature treatment can significantly affect the distribution even the nature of the Fe species in Fe/Ga-ZSM-5. For the high-temperature treated catalysts, the presence of extra-framework Ga remarkably increases the amount of the Fe(II) sites and the activity of direct N2O decomposition, suggesting that extra-framework Ga can promote the formation of the active sites for N2O decomposition. The possible interpretation of the beneficial role of extra-framework Ga is that extra-framework Ga facilitates the reduction of bi- and oligo-nuclear Fe(III) sites to form the Fe(II) sites and interacts with the Fe sites with low nuclearity to form a mixed Fe-Ga-O phase for the high-temperature treated catalysts. (C) 2008 Elsevier Inc. All rights reserved.
关键词[WOS]: NITROUS-OXIDE DECOMPOSITION ;  SELECTIVE CATALYTIC-REDUCTION ;  HIGH-TEMPERATURE TREATMENT ;  CHEMICAL-VAPOR-DEPOSITION ;  N2O DECOMPOSITION ;  ACTIVE-SITES ;  BENZENE HYDROXYLATION ;  NOX REDUCTION ;  MFI ZEOLITES ;  MOSSBAUER-SPECTROSCOPY
语种: 英语
WOS记录号: WOS:000260978000013
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140829
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
2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China

Recommended Citation:
Xia, Haian,Sun, Keqiang,Fan, Fengtao,et al. Effect of extra-framework gallium on the structure of iron species in Fe/ZSM-5[J]. JOURNAL OF CATALYSIS,2008,259(2):269-275.
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