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题名: MAS NMR studies of modified HY zeolites
作者: Li, WL;  Wang, Y;  Tan, ZY;  Bao, XH
关键词: HY zeolite ;  MAS NMR ;  modification ;  acidic site ;  loading
刊名: CHINESE SCIENCE BULLETIN
发表日期: 2000-02-01
卷: 45, 期:4, 页:325-330
收录类别: SCI
文章类型: Article
部门归属: 5
项目归属: 502
WOS标题词: Science & Technology
类目[WOS]: Multidisciplinary Sciences
研究领域[WOS]: Science & Technology - Other Topics
英文摘要: The variations in structure and acidity on the internal and external surfaces of HY zeolites modified by MgO and SiO2 have been studied by MAS NMR, together with the selective adsorption of perfluorotributyl-amine. Al-27 and Si-29 MAS NMR spectra revealed that the modifications led to significant changes of the framework owing to the migration of some non-framework Si and Al into the framework in the course of the modifications. H-1 MAS NMR spectra showed that the modifications decreased the acidity of the zeolite surfaces. With an increasing of the loading of the oxides, the acidity of the surface decreased further. Both of the two kinds of Bronsted acidity of the MgO-modified HY zeolites decreased, particularly those in the supercages, while those of the SiO2-modified HY zeolites decreased less, and this result is consistent with that of NH3-TPD, from the adsorption of perfluorotributyl-amine, it was found that the acidic sites on the external surface of the HY zeolite can be completely covered by SiO2 after being modified by the chemical liquid deposition (CLD) method.
关键词[WOS]: TEMPERATURE-PROGRAMMED DESORPTION ;  BRONSTED-ACID ;  SPECTROSCOPY ;  CATALYSTS ;  AMMONIA ;  SITES
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000085980600007
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/85053
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.Liaoning Normal Univ, Dept Chem, Dalian 116029, Peoples R China

Recommended Citation:
Li, WL,Wang, Y,Tan, ZY,et al. MAS NMR studies of modified HY zeolites[J]. CHINESE SCIENCE BULLETIN,2000,45(4):325-330.
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