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题名: Synthesis, characterization and catalytic performance of Ti-containing mesoporous molecular sieves assembled from titanosilicate precursors
作者: Jin, Changzi;  Li, Gang;  Wang, Xiangsheng;  Zhao, Lixia;  Liu, Liping;  Liu, Haiou;  Liu, Yong;  Zhang, Weiping;  Han, Xiuwen;  Bao, Xinhe
刊名: CHEMISTRY OF MATERIALS
发表日期: 2007-04-03
DOI: 10.1021/cm0625777
卷: 19, 期:7, 页:1664-1670
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Materials Science
英文摘要: Novel Ti-containing mesoporous materials with wormhole structure (Ti-WMS) can be assembled from preformed titanosilicate-1 precursors with long-chain alkylamines as structure directors. The obtained products were characterized by a series of techniques including powder X-ray diffraction, transmission electron microscopy, FT-infrared spectroscopy, UV-visible spectroscopy, N-2 sorption, and hyperpolarized Xe-129 NMR at variable temperature. The catalytic properties of the materials were investigated by oxidative desulfurization reactions. The results show that Ti-WMS, whose synthesis utilizes zeolite precursors as total or part of the silica and titanium sources, is a pure mesoporous phase. However, the prepared materials contain additional micropores except the uniform mesopores, which is confirmed by N-2 sorption and Xe-129 NMR. Infrared spectra indicate that there are zeolitic primary and secondary building units in the pore walls of Ti-WMS. UV-visible spectroscopy results confirm the existence of active Ti4+ species. Ti-WMS is very active in the oxidation of bulky sulfides such as benzothiophene, dibenzothiophene, and 4,6-dimethyl dibenzothiophene, with activities similar to Ti-HMS. However, in thiophene oxidation, which is not diffusion-limited, Ti-WMS exhibits much higher catalytic activity than Ti-HMS because of the presence of micropores and zeolite-like active sites.
关键词[WOS]: HYDROGEN-PEROXIDE ;  ZEOLITE-BETA ;  TITANIUM ;  OXIDATION ;  MFI ;  MECHANISM ;  THIOPHENE ;  SILICA ;  SITES ;  MEDIA
语种: 英语
WOS记录号: WOS:000245208100020
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140592
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.Dalian Univ Technol, State Key Lab Fine Chem, Dept Catalyt Chem & Engn, Dalian 116012, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Jin, Changzi,Li, Gang,Wang, Xiangsheng,et al. Synthesis, characterization and catalytic performance of Ti-containing mesoporous molecular sieves assembled from titanosilicate precursors[J]. CHEMISTRY OF MATERIALS,2007,19(7):1664-1670.
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