Abstract
Acid treated silica fibers, coming either from asbestos cord waste or calcium aluminosilicate glass, were engaged as reactants to product MFI type zeolite fibers applying a dry gel conversion (DGC) type synthesis. The impact of amorphous silica fiber shape and synthesis conditions on morphology of the final product was investigated. Enhanced zeolite nucleation and restricted crystal growth are necessary to maintain the initial fiber morphology. Whereas a DGC type crystallization in hydroxide media results in the formation of zeolite fibers, the use of fluoride ions leads to the formation of large individual zeolite particles. Synthesis conditions have to be adapted to form zeolite particles with an average size smaller than the silica fiber diameter to allow a good conservation of the fiber morphology. Final zeolite fibers have textural properties comparable to a standard zeolite product and are promising for adsorption applications.
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Acknowledgments
The authors gratefully acknowledge the financial support from the French ADEME agency (Agence de l’Environnement et de la Maîtrise de l’Energie). Thanks are due to Dr. R.-C. Regis for fruitful discussion.
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Goergen, S., Saada, M.A., Soulard, M. et al. Dry gel conversion synthesis of shape controlled MFI type zeolite materials. J Porous Mater 17, 635–641 (2010). https://doi.org/10.1007/s10934-009-9333-0
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DOI: https://doi.org/10.1007/s10934-009-9333-0