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Al-27 MAS NMR Studies of HBEA Zeolite at Low to High Magnetic Fields
Hu, Jian Zhi1,2; Wan, Chuan1,2; Vjunov, Aleksei1,2; Wang, Meng1,2; Zhao, Zhenchao1,2,5; Hu, Mary Y.1,2; Camaioni, Donald M.1,2; Lercher, Johannes A.1,2,3,4
刊名JOURNAL OF PHYSICAL CHEMISTRY C
2017-06-15
DOI10.1021/acs.jpcc.7b03517
121页:12849-12854
收录类别SCI
文章类型Article
WOS标题词Science & Technology ; Physical Sciences ; Technology
类目[WOS]Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary
研究领域[WOS]Chemistry ; Science & Technology - Other Topics ; Materials Science
关键词[WOS]SOLID-STATE NMR ; HOT LIQUID WATER ; FRAMEWORK ; ALUMINUM ; BETA ; CATALYSTS ; IMPACT ; SITES ; MQMAS ; BEA
英文摘要Al-27 single pulse (SP) MAS NMR :spectra,of RUA zeolites With high. Si/AL ratios of 71 and were obtained at three magnetic field strengths of 7.05, 11.75, and 19.97 T. High field Al-27 MAS NMR spectra acquired at 19.97 T show significantly improved spectral resolution, resulting in at least two well-resolved tetrahedral-Al NMR peaks. Based on, the results obtained from Al-27 MAS and MQMAS NMR, acquired at 19,97 T,four different, quadrupole peaks are used to deconvolute the Al-27 SP MAS spectra acquired at various fields by using the, same set of quadrupole coupling constants, asymmetric parameters and relative integrated peak intensities for the tetrahedral Al peaks. The line shapes of individual peaks change from typical quadrupole line shape at low field to essentially symmetrical line shapes at high field. We demonstrate,thatt for fully, hydrated HBEA zeolites, the effect of second order quadrupole interaction can be ignored, and quantitative spectral analysis can be, erformed by directly fitting the high field, spectra using mixed Gaussian/Lorentzian line shapes. Also, the analytical steps described in our work,allOw direct assignment of spectral intensity to individual Al tetrahedral sites (T-Sites) of zeolite HBEA. Finally, the proposed concept is suggested to be generally applicable to other zeolite framework types, thus allowing a direct probing of Al distributioUs by NMR spectroscopic methods in zeolites with high confidence.
语种英语
WOS记录号WOS:000403731700039
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文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/152104
专题中国科学院大连化学物理研究所
作者单位1.Pacific Northwest Natl Lab Richland, Inst Integrated Catalysis, Washington, DC 99354 USA
2.Pacific Northwest Natl Lab Richland, Fundamental & Computat Sci Directorate, Washington, DC 99354 USA
3.Tech Univ Munich, Dept Chem, Lichtenbergstr 4, D-85748 Garching, Germany
4.Tech Univ Munich, Catalysis Res Inst, Lichtenbergstr 4, D-85748 Garching, Germany
5.Chinese Acad Sci, Dalian Inst Chem Phys, 457 Zhongshan Rd, Dalian 116023, Peoples R China
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Hu, Jian Zhi,Wan, Chuan,Vjunov, Aleksei,et al. Al-27 MAS NMR Studies of HBEA Zeolite at Low to High Magnetic Fields[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2017,121:12849-12854.
APA Hu, Jian Zhi.,Wan, Chuan.,Vjunov, Aleksei.,Wang, Meng.,Zhao, Zhenchao.,...&Lercher, Johannes A..(2017).Al-27 MAS NMR Studies of HBEA Zeolite at Low to High Magnetic Fields.JOURNAL OF PHYSICAL CHEMISTRY C,121,12849-12854.
MLA Hu, Jian Zhi,et al."Al-27 MAS NMR Studies of HBEA Zeolite at Low to High Magnetic Fields".JOURNAL OF PHYSICAL CHEMISTRY C 121(2017):12849-12854.
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