TY - JOUR
T1 - Mechanism of zeolite X crystallization from diatomite
AU - Yao, Guangyuan
AU - Lei, Jingjing
AU - Zhang, Xiaoyu
AU - Sun, Zhiming
AU - Zheng, Shuilin
AU - Komarneni, Sridhar
N1 - Funding Information:
The authors gratefully acknowledge the financial support provided by the Young Elite Scientists Sponsorship Program by CAST (2017QNRC001), Yueqi Funding Scheme for Young Scholars (China university of Mining &Technology, Beijing), Fundamental Research Funds for the Central Universities ( 2015QH01 and 2010YH10 ). The first author also thanks the China Scholarship Council (CSC) for financial support.
Publisher Copyright:
© 2018 Elsevier Ltd
PY - 2018/11
Y1 - 2018/11
N2 - Here we systemically investigated the crystallization process of zeolite X using diatomite, a natural cost-effective silica precursor by the hydrothermal method. To decipher the mechanism, solids were separated from the mixtures at various stages of crystallization and were characterized by XRD, SEM, solid state NMR, FT-IR, UV-Raman and XRF. The XRD patterns revealed that the crystallization started between 3 and 3.5 h and ended by 5 h. The SEM images showed that the intermediate species of zeolite X appear on the surface of particles. The FT-IR and UV-Raman spectra suggested the presence of double six-membered rings (D6R) in the framework of zeolite X and they played a critical role in the crystallization process. Furthermore, the UV-Raman spectra indicated that the secondary building units of β cages formed the intermediate species and they were interconnected via double six-membered rings to form the framework of zeolite X.
AB - Here we systemically investigated the crystallization process of zeolite X using diatomite, a natural cost-effective silica precursor by the hydrothermal method. To decipher the mechanism, solids were separated from the mixtures at various stages of crystallization and were characterized by XRD, SEM, solid state NMR, FT-IR, UV-Raman and XRF. The XRD patterns revealed that the crystallization started between 3 and 3.5 h and ended by 5 h. The SEM images showed that the intermediate species of zeolite X appear on the surface of particles. The FT-IR and UV-Raman spectra suggested the presence of double six-membered rings (D6R) in the framework of zeolite X and they played a critical role in the crystallization process. Furthermore, the UV-Raman spectra indicated that the secondary building units of β cages formed the intermediate species and they were interconnected via double six-membered rings to form the framework of zeolite X.
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U2 - 10.1016/j.materresbull.2018.07.021
DO - 10.1016/j.materresbull.2018.07.021
M3 - Article
AN - SCOPUS:85050089205
SN - 0025-5408
VL - 107
SP - 132
EP - 138
JO - Materials Research Bulletin
JF - Materials Research Bulletin
ER -