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题名: A high-resolution solid-state NMR study on nano-structured HZSM-5 zeolite
作者: Zhang, WP;  Bao, XH;  Guo, XW;  Wang, XS
关键词: solid-state NMR ;  nano-structured HZSM-5 zeolite ;  probe molecule ;  perfluorotributyl amine ((n-C4F9)(3)N)
刊名: CATALYSIS LETTERS
发表日期: 1999
卷: 60, 期:1-2, 页:89-94
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: Variations in the structure and acidity properties of HZSM-5 zeolites with reduction in crystal sizes down to nanoscale (less than 100 nm) have been investigated by XRD, TEM and solid-state NMR with a system capable of in situ sample pretreatment. As evidenced by a combination of Al-27 MAS NMR, Si-29 MAS, CP/MAS NMR and H-1 MAS NMR techniques, the downsize of the zeolite crystal leads to an obvious line broadening of the Al-27, Si-29 MAS NMR spectrum, an increasing of the silanol concentration on the external surface, and a pronounced alteration of the acidity distribution between the external and internal surfaces of the zeolite. In a HZSM-5 zeolite with an average size at about 70 nm, the nonacidic hydroxyl groups (silanols) are about 14% with respect to the total amount of Si, while only 4% of such hydroxyl groups exist in the same kind of zeolite at 1000 nm crystal size. The result of H-1 MAS NMR obtained using Fluorinert(R) FC-43 (perfluorotributyl amine) as a probe molecule demonstrates that most of the silanols are located on the external surface of the zeolite. Moreover, the concentration of Bronsted acid sites on the external surface of the nano-structured zeolite appears to be distinctly higher than that of the microsized zeolite.
关键词[WOS]: ACID SITES ;  CATALYTIC CRACKING ;  CRYSTALLITE SIZE ;  ZSM-5 ZEOLITES ;  PARTICLE-SIZE ;  BRONSTED-ACID ;  CAVERN DESIGN ;  SELECTIVITY ;  RESONANCE ;  MOLECULES
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000081052800014
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/85651
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.Dalian Univ Technol, Lab Comprehens Utiliz Carbonaceous Resources, Dalian 116012, Peoples R China

Recommended Citation:
Zhang, WP,Bao, XH,Guo, XW,et al. A high-resolution solid-state NMR study on nano-structured HZSM-5 zeolite[J]. CATALYSIS LETTERS,1999,60(1-2):89-94.
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