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Investigation of Aluminum Site Changes of Dehydrated Zeolite H-Beta during a Rehydration Process by High-Field Solid-State NMR
Zhao, Zhenchao1,2; Xu, Suochang1,3; Hu, Mary Y.1; Bao, Xinhe2,3; Peden, Charles H. F.1; Hu, Jianzhi1
Source PublicationJOURNAL OF PHYSICAL CHEMISTRY C
2015-01-22
DOI10.1021/jp509982r
Volume119Issue:3Pages:1410-1417
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
WOS SubjectChemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary
WOS Research AreaChemistry ; Science & Technology - Other Topics ; Materials Science
WOS KeywordEXTRA-FRAMEWORK ALUMINUM ; MQMAS NMR ; AL-27 MAS ; NONFRAMEWORK ALUMINUM ; PROTON-TRANSFER ; ACID SITES ; SPECTROSCOPY ; DEALUMINATION ; TRANSFORMATION ; MOLECULES
AbstractAluminum site changes of dehydrated H-Beta zeolite during a rehydration process are systematically investigated by Al-27 MAS and MQ MAS NMR at a high magnetic field up to 19.9 T. Benefiting from the high magnetic field, more detailed information is obtained from the considerably broadened and overlapped spectra of dehydrated H-Beta zeolite. Dynamic changes of aluminum sites are demonstrated during the rehydration process. In completely dehydrated H-Beta, invisible aluminums can reach 29%. The strength of quadrupole interactions for framework aluminum sites decreases gradually during the progressive water adsorption process. Extra-framework aluminum (EFAL) species, that is, penta- (34 ppm) and octahedral- (4 ppm) coordinated aluminum atoms, rise initially with increasing amount of water adsorption, and finally change into either tetra-coordinated framework or extra-framework aluminum in water saturated samples, with the remaining octahedrally coordinated aluminum lying at 0 and -4 ppm, respectively. Quantitative Al-27 MAS NMR analysis combined with 1H MAS NMR indicates that some active EFAL species formed during calcination can reinsert into the framework during this hydration process. The assignment of aluminum at 0 ppm to EFAL cation and -4 ppm to framework aluminum is clarified for H-Beta zeolite.
Language英语
WOS IDWOS:000348491900016
Citation statistics
Cited Times:26[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/146010
Collection中国科学院大连化学物理研究所
Affiliation1.Pacific NW Natl Lab, Richland, WA 99352 USA
2.Xiamen Univ, Collaborat Innovat Ctr Chem Energy Mat, Xiamen 361005, Peoples R China
3.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
Recommended Citation
GB/T 7714
Zhao, Zhenchao,Xu, Suochang,Hu, Mary Y.,et al. Investigation of Aluminum Site Changes of Dehydrated Zeolite H-Beta during a Rehydration Process by High-Field Solid-State NMR[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2015,119(3):1410-1417.
APA Zhao, Zhenchao,Xu, Suochang,Hu, Mary Y.,Bao, Xinhe,Peden, Charles H. F.,&Hu, Jianzhi.(2015).Investigation of Aluminum Site Changes of Dehydrated Zeolite H-Beta during a Rehydration Process by High-Field Solid-State NMR.JOURNAL OF PHYSICAL CHEMISTRY C,119(3),1410-1417.
MLA Zhao, Zhenchao,et al."Investigation of Aluminum Site Changes of Dehydrated Zeolite H-Beta during a Rehydration Process by High-Field Solid-State NMR".JOURNAL OF PHYSICAL CHEMISTRY C 119.3(2015):1410-1417.
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