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题名: Effect of aluminum on the nature of the iron species in Fe-SBA-15
作者: Li, Ying;  Feng, Zhaochi;  Xin, Hongchuan;  Fan, Fengtao;  Zhang, Jing;  Magusin, Pieter C. M. M.;  Hensen, Emiel J. M.;  van Santen, Rutger A.;  Yang, Qihua;  Li, Can
通讯作者: 李灿
刊名: JOURNAL OF PHYSICAL CHEMISTRY B
发表日期: 2006-12-28
DOI: 10.1021/jp065764l
卷: 110, 期:51, 页:26114-26121
收录类别: SCI
文章类型: Article
部门归属: 5
项目归属: 503,506
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: We report the preparation of highly ordered mesoporous Fe-Al-SBA-15 with isolated extraframework Fe species under acidic conditions. The materials were characterized by means of UV resonance Raman spectroscopy, in conjunction with BET, XRD, TEM, UV-vis, H-2-TPR, FT-IR, and Al-27 MAS NMR spectroscopy. The addition of both Fe and Al to the synthesis gel of SBA-15 results in the formation of isolated extraframework Fe species located close to the framework Al ions and the Fe content an order of magnitude higher than that in Fe-SBA-15 synthesized without Al. The existence of anchored extraframework Fe species was confirmed by the presence of a strong absorption band at 270 nm, hydrogen reduction at relatively low temperature, and the presence of a resonance Raman band at 1140 cm(-1). The location of Fe in close proximity to framework Al nuclei is further supported by Al-27 MAS NMR measurements. Two characteristic UV Raman bands at 510 cm(-1) and 1090 cm(-1) excited by 244-nm laser are assigned to Fe-O-Si symmetric and asymmetric stretching modes of isolated tetrahedral Fe ions in the silica framework for Fe-SBA-15. The resonance Raman band at 1140 cm(-1) excited by 325-nm laser is attributed to the asymmetric stretching mode of the isolated extraframework iron species in Fe-Al-SBA-15. The isolated Fe species close to framework Al species are stable in acidic HCl solution, whereas the majority of Fe species in Fe-SBA-15 can be easily removed.
关键词[WOS]: RESONANCE RAMAN-SPECTROSCOPY ;  HIGH-TEMPERATURE TREATMENT ;  CHEMICAL-VAPOR-DEPOSITION ;  DIRECT N2O DECOMPOSITION ;  STATE ION-EXCHANGE ;  NITROUS-OXIDE ;  SELECTIVE OXIDATION ;  MESOPOROUS SILICA ;  EXTRAFRAMEWORK IRON ;  FE-SILICALITE
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000242974300083
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/98357
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.Eindhoven Univ Technol, Schuit Inst Catalysis, NL-5600 MB Eindhoven, Netherlands

Recommended Citation:
Li, Ying,Feng, Zhaochi,Xin, Hongchuan,et al. Effect of aluminum on the nature of the iron species in Fe-SBA-15[J]. JOURNAL OF PHYSICAL CHEMISTRY B,2006,110(51):26114-26121.
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