Abstract
In this research, hydrothermal/alkali fusion synthesis of zeolite NaX and NaA was reported by using pyrophyllite as the source of Si and Al. Characterization of synthesized compounds was carried out by X-ray diffraction, X-ray fluorescence, FESEM (field emission scanning electron microscopy), and BET (Brunauer–Emmett–Teller) analyses. To activate pyrophyllite, two methods including calcination and alkali fusion were employed. Calcination of pyrophyllite resulted in the dehydroxylation process. Four batch formulas were set to the synthesis of zeolite structure from dehydroxylated pyrophyllite which resulted in producing sodalite zeolite. Results showed that alkali fusion is an effective method for the activation of pyrophyllite. Zeolite NaA with a crystallinity of about 56% was successfully synthesized at 90 °C with an average particle size around 0.085 μm. In the case of zeolite NaX, the synthesis was performed at 120 °C while the particle size is around 1.73 μm. However, it was found that for producing a high crystallinity of zeolite NaX, longer crystallization time is needed. BET results revealed that the specific surface area of the synthesized zeolite NaX is around 12 m2/gr with an average pore volume of 0.054 cm3/g.
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Habibi, M.K., Rafiaei, S.M. Hydrothermal/Alkali Fusion Synthesis of Zeolite NaA and NaX from Pyrophyllite Mineral Clay. Trans Indian Inst Met (2024). https://doi.org/10.1007/s12666-024-03272-5
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DOI: https://doi.org/10.1007/s12666-024-03272-5