Investigation on the cation location, structure and performances of rare earth-exchanged Y zeolite

A series of Y zeolites exchanged with different amount of cerium and lanthanum cations were investigated. Comprehensive routine analysis tools including X-ray photoelectron spectroscopy（XPS）, X-ray fluorescence（XRF）, X-ray diffraction（XRD） and Py-Fourier transform infrared spectroscopy（Py-FTIR） were...

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Published inJournal of rare earths Vol. 35; no. 7; pp. 658 - 666
Main Author 邱丽美 付颖 郑金玉 黄南贵 卢立军 高秀枝 忻睦迪 罗一斌 史延强 徐广通
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.07.2017
Subjects
cation location
characterization
hydrothermal stability
in situ XRD
micro-activity
RE-modified
Rietveld分析
Y zeolite
Y分子筛
位置
傅里叶变换红外光谱
性能比
稀土离子
结构特性
阳离子
hydrothermal stability
RE-modified
cation location
micro-activity
Y zeolite
characterization
in situ XRD
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Summary:A series of Y zeolites exchanged with different amount of cerium and lanthanum cations were investigated. Comprehensive routine analysis tools including X-ray photoelectron spectroscopy（XPS）, X-ray fluorescence（XRF）, X-ray diffraction（XRD） and Py-Fourier transform infrared spectroscopy（Py-FTIR） were used to identify the cation location, and the result was verified via XRD Rietveld study. The results revealed that almost all the RE cations in RE-4, most cations in RE-8 to RE-14 and part of cations in RE-16 were located in the sodalite cage. The Al~（IV）/（Al~V＋Al~（VI）） values revealed by ~（27）Al MAS NMR spectra, the silicon aluminum ratio of the framework（SARF） values deduced from ~（29）Si MAS NMR spectra and XRD, and hydroxyl amount were reasonably in accordance with the location and content of rare earth cations. The hydrothermal stability derived from in situ XRD investigation and catalyst activity provided by micro-activity test manifested that samples RE-8 to RE-14 exhibited better performances than RE-4 and RE-16, among which RE-12 had the best properties. The phenomena were interpreted by the cation location and structural properties.
Bibliography:RE-modified Y zeolite characterization cation location in situ XRD hydrothermal stability micro-activity
11-2788/TF
A series of Y zeolites exchanged with different amount of cerium and lanthanum cations were investigated. Comprehensive routine analysis tools including X-ray photoelectron spectroscopy（XPS）, X-ray fluorescence（XRF）, X-ray diffraction（XRD） and Py-Fourier transform infrared spectroscopy（Py-FTIR） were used to identify the cation location, and the result was verified via XRD Rietveld study. The results revealed that almost all the RE cations in RE-4, most cations in RE-8 to RE-14 and part of cations in RE-16 were located in the sodalite cage. The Al~（IV）/（Al~V＋Al~（VI）） values revealed by ~（27）Al MAS NMR spectra, the silicon aluminum ratio of the framework（SARF） values deduced from ~（29）Si MAS NMR spectra and XRD, and hydroxyl amount were reasonably in accordance with the location and content of rare earth cations. The hydrothermal stability derived from in situ XRD investigation and catalyst activity provided by micro-activity test manifested that samples RE-8 to RE-14 exhibited better performances than RE-4 and RE-16, among which RE-12 had the best properties. The phenomena were interpreted by the cation location and structural properties.
ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(17)60960-8