DICP OpenIR
A high-resolution solid-state NMR study on nano-structured HZSM-5 zeolite
Zhang, WP; Bao, XH; Guo, XW; Wang, XS
KeywordSolid-state Nmr Nano-structured Hzsm-5 Zeolite Probe Molecule Perfluorotributyl Amine ((N-c4f9)(3)n)
Source PublicationCATALYSIS LETTERS
1999
Volume60Issue:1-2Pages:89-94
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
WOS SubjectChemistry, Physical
WOS Research AreaChemistry
WOS KeywordACID SITES ; CATALYTIC CRACKING ; CRYSTALLITE SIZE ; ZSM-5 ZEOLITES ; PARTICLE-SIZE ; BRONSTED-ACID ; CAVERN DESIGN ; SELECTIVITY ; RESONANCE ; MOLECULES
AbstractVariations 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.
Language英语
URL查看原文
WOS IDWOS:000081052800014
Citation statistics
Cited Times:87[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/85651
Collection中国科学院大连化学物理研究所
Affiliation1.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
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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