Abstract
The relationship between the concentration of sodium cations and the properties of faujasite(FAU) zeolite was investigated using a two-step synthesis procedure including (1) formation of amorphous aluminosilicate precursors and separation of amorphous nanoparticles, and (2) transformation of these amorphous particles into zeolite crystals by treatment with alkali solutions(NaOH). Three representative samples including two nano-sized zeolites and one micron-sized zeolite were prepared using different concentrations of sodium hydroxide. The crystallization process of these zeolites was studied in detail by Fourier transform infrared(FTIR) spectrometry, nuclear magnetic resonance spectroscopy(NMR), X-ray diffraction(XRD), scanning electron microscopy (SEM), transmission electron microscopy(TEM), and N2 adsorption. The results indicated that minor changes in the concertation of inorganic cations can significantly shorten the induction period and crystallization time and thus affect the morphology, size and chemical composition of the zeolite crystals.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Nos.U1862118, 21975285, 21991091, 21991090, 21908246), the Fundamental Research Funds for the Central Universities, China(No.21CX06024A) and the Postgraduate Innovation Projects of China University of Petroleum(East China) (No.YCX2021053).
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Zhao, L., Yang, G., Guo, H. et al. Effect of Sodium Concentration on the Synthesis of Faujasite by Two-step Synthesis Procedure. Chem. Res. Chin. Univ. 37, 1137–1142 (2021). https://doi.org/10.1007/s40242-021-1292-2
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DOI: https://doi.org/10.1007/s40242-021-1292-2