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A high-resolution solid-state NMR study on nano-structured HZSM-5 zeolite
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
1999
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
关键词[WOS]ACID SITES ; CATALYTIC CRACKING ; CRYSTALLITE SIZE ; ZSM-5 ZEOLITES ; PARTICLE-SIZE ; BRONSTED-ACID ; CAVERN DESIGN ; SELECTIVITY ; RESONANCE ; MOLECULES
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.
语种英语
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WOS记录号WOS:000081052800014
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被引频次:85[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/85651
专题中国科学院大连化学物理研究所
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
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GB/T 7714
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.
APA Zhang, WP,Bao, XH,Guo, XW,&Wang, XS.(1999).A high-resolution solid-state NMR study on nano-structured HZSM-5 zeolite.CATALYSIS LETTERS,60(1-2),89-94.
MLA Zhang, WP,et al."A high-resolution solid-state NMR study on nano-structured HZSM-5 zeolite".CATALYSIS LETTERS 60.1-2(1999):89-94.
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