Abstract
In-situ coating of zeolite Na-A crystals on Al2O3-SiO2 glass fibers was investigated by a low temperature chemical process. The glass fibers were reacted with various concentrations of NaOH solutions at 60–110°C for various times. The surface of glass fibers was first leached by the solution but crystals of zeolite Na-A precipitated on the glass fibers after a certain reaction time because the concentrations of Si and Al components in the solution increased by dissolution of the glass fibers. The precipitated zeolite was identified to be Na-A type but nosean-cancrinite-type phase and/or hydroxysodalite coexisted with zeolite Na-A at longer reaction times. With higher concentration of NaOH solution, the formation rate of zeolite Na-A was faster, the formation temperature was lower and the grain size was smaller ca. 2–3 μm. Dense zeolite Na-A coatings were produced when the glass fibers were reacted in 4 M NaOH solution at 60°C for 18 h. The amount of zeolite Na-A formed on the fibers was about 20 mass%.
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Okada, K., Shinkawa, H., Takei, T. et al. In-Situ Coating of Zeolite Na-A on Al2O3-SiO2 Glass Fibers. Journal of Porous Materials 5, 163–168 (1998). https://doi.org/10.1023/A:1009661925215
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DOI: https://doi.org/10.1023/A:1009661925215