Abstract
FeAlPO-16 molecular sieve with AST topology has been ionothermally prepared under microwave irradiation in succinic acid-choline chloride eutectic mixture for the first time. The structure and morphology of FeAlPO-16 molecular sieve are characterized in detail by powder X-Ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), diffuse reflectance UV–visible (UV–vis) spectroscopy, thermogravimetry–differential scanning calorimetry analysis (TG-DSC) and scanning electron microscopy (SEM). UV–vis results suggest that iron species may partially enter the framework of FeAlPO-16 molecular sieve. SEM images indicate that large spherical particles observed in the images are agglomerates of FeAlPO-16 molecular sieve nanocrystalline (ca. 100 nm in size). Effects of synthesis conditions, such as P2O5/Al2O3 ratio, pyridine/Al2O3 ratio, reaction temperature and crystallization time, as well as iron and aluminum source on the crystallization of FeAlPO-16 molecular sieve are systematically investigated. Experiments show that FeAlPO-16 molecular sieve can be prepared over a wide molar ratio of Al2O3:xP2O5:yPyridine:0.4Fe2O3:58EU (x = 1.0–3.5, y = 0.8–7.8) using aluminum isopropoxide and ferric ammonium citrate as iron and aluminum source, respectively. The synthesis of FeAlPO-16 molecular sieve is highly sensitive to iron source, but not to aluminum source, crystallization temperature and time.
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This work was supported by a grant from the Ph.D Development Foundation of Lanzhou University of Technology (No. SB05200701).
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Zhao, X., Kang, C., Wang, H. et al. Ionothermal synthesis of FeAlPO-16 molecular sieve by microwave irradiation in eutectic mixture. J Porous Mater 18, 615–621 (2011). https://doi.org/10.1007/s10934-010-9417-x
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DOI: https://doi.org/10.1007/s10934-010-9417-x