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学科主题: 物理化学
题名: Structure and Basicity of Microporous Titanosilicate ETS-10 and Vanadium-Containing ETS-10
作者: Guo, Meiling1, 2;  Pidko, Evgeny A.3;  Fan, Fengtao1;  Feng, Zhaochi1;  Hofmann, Jan P.4;  Weckhuysen, Bert M.4;  Hensen, Emiel J. M.3;  Li, Can1
通讯作者: EmielJMHensen ;  李灿
刊名: JOURNAL OF PHYSICAL CHEMISTRY C
发表日期: 2012-08-16
DOI: 10.1021/jp305543m
卷: 116, 期:32, 页:17124-17133
收录类别: SCI
文章类型: Article
部门归属: 5
项目归属: 503
产权排名: 1,1
类目[WOS]: Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science
英文摘要: ETS-10 has attracted considerable attention as a base catalyst. It is desirable to confirm the location of basic sites. Vanadium-substituted ETS-10 also attracts much attention for the interesting feature that the Ti can be fully replaced by V without changing its topology. It is important to characterize the local environment upon V substitution for understanding the property and reactivity of ETVS-10. The structural and acid-base properties of pure titanosilicate ETS-10 and a series of vanadium-substituted ETVS-10 with different framework V content were studied by a combination of Raman spectroscopy and FTIR of absorbed acetylene and carbon monoxide as molecular probes. The substitution of up to 70% of Ti atoms with V in the structure of ETS-10 results in ETVS-10 materials with a homogeneous distribution of Ti and V species. At higher V concentrations, a distinct phase separation between the vanadium-rich domains is observed. The intrinsic basicity of ETVS-10 as revealed by FTIR spectroscopy of adsorbed C2H2 gradually increases with the increasing V content. It is shown that the specific basicity of the ETS-10 lattice is mainly associated with the presence of highly basic oxygen centers adjacent to the lattice defects. Liquid phase Knoevenagel condensation of benzaldehyde with ethyl cyanoacetate was used as a test reaction to investigate the catalytic reactivity of different basic sites in the synthesized materials. The reactivity of the materials considered in the base-catalyzed Knoevenagel condensation is determined not only by the strength of the basic sites but also by their density. The optimum combination of both factors is achieved for the ETVS-10 material with V/(Ti+V) ratio of 70%.
关键词[WOS]: ADSORBED PROBE MOLECULES ;  SUBSTITUTED ETS-10 ;  BASE CATALYSTS ;  QUANTUM WIRES ;  ZEOLITES ;  CONDENSATION ;  SITES ;  SPECTROSCOPY ;  OXIDES
语种: 英语
WOS记录号: WOS:000307494600039
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/118255
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 Univ, Dalian 116023, Peoples R China
3.Eindhoven Univ Technol, Schuit Inst Catalysis, NL-5600 MB Eindhoven, Netherlands
4.Univ Utrecht, Debye Inst NanoMat Sci, NL-3584 CG Utrecht, Netherlands

Recommended Citation:
Guo, Meiling,Pidko, Evgeny A.,Fan, Fengtao,et al. Structure and Basicity of Microporous Titanosilicate ETS-10 and Vanadium-Containing ETS-10[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2012,116(32):17124-17133.
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