TY - JOUR
T1 - Comparative study of aluminosilicate glass and zeolite precursors in terms of Na environment and network structure
AU - Yamada, Hiroki
AU - Sukenaga, Sohei
AU - Ohara, Koji
AU - Anand, Chokkalingam
AU - Ando, Mariko
AU - Shibata, Hiroyuki
AU - Okubo, Tatsuya
AU - Wakihara, Toru
N1 - Funding Information:
The High-energy X-ray total scattering experiments at the SPring–8 were approved by the Japan Synchrotron Radiation Research Institute under proposal nos. 2016B0115 , 2017A0115 , and 2017B0115 . This work was supported in part by JSPS KAKENHI Grant Nos. JP16H04543 (H.S.), the Cooperative Research Program of “Network Joint Research Center for Materials and Devices” , and the Nanotechnology Platform Program (Molecule and Material Synthesis) of the Ministry of Education, Culture, Sports and Technology (MEXT), Japan . We thank Mr. Shinichiro Yoshida (Research and Analytical Center for Giant Molecules, Tohoku University) for assistance with the MQ-MAS NMR experiments.
Publisher Copyright:
© 2018 Elsevier Inc.
PY - 2018/11/15
Y1 - 2018/11/15
N2 - Revealing structural features of the amorphous precursor of zeolite is an important research topic for elucidating formation mechanism of zeolites. To understand the zeolite precursor's comprehensive structural features, this study compared the precursor with the glass possessing similar compositions. By combining the high-energy X-ray total scattering method, 23Na-MQ-MAS-NMR, and reverse Monte Carlo simulation, we revealed structural differences among FAU-type zeolites, their precursors, and glass with similar compositions. As for crystallization behavior of FAU-type zeolite, pair distribution function and NMR analyses revealed that the environment of Na became gradually ordered during the crystallization. In addition, relaxation of large aluminosilicate rings was also confirmed. Comparison of the zeolite precursor and the glass clarified differences in Na–O distances and ring distributions, and simulation modeling supported these insights.
AB - Revealing structural features of the amorphous precursor of zeolite is an important research topic for elucidating formation mechanism of zeolites. To understand the zeolite precursor's comprehensive structural features, this study compared the precursor with the glass possessing similar compositions. By combining the high-energy X-ray total scattering method, 23Na-MQ-MAS-NMR, and reverse Monte Carlo simulation, we revealed structural differences among FAU-type zeolites, their precursors, and glass with similar compositions. As for crystallization behavior of FAU-type zeolite, pair distribution function and NMR analyses revealed that the environment of Na became gradually ordered during the crystallization. In addition, relaxation of large aluminosilicate rings was also confirmed. Comparison of the zeolite precursor and the glass clarified differences in Na–O distances and ring distributions, and simulation modeling supported these insights.
KW - Crystallization mechanism
KW - FAU-type zeolite
KW - NMR
KW - Pair distribution function
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U2 - 10.1016/j.micromeso.2018.05.006
DO - 10.1016/j.micromeso.2018.05.006
M3 - Article
AN - SCOPUS:85047612346
SN - 1387-1811
VL - 271
SP - 33
EP - 40
JO - Zeolites
JF - Zeolites
ER -