Abstract
The support substrates were modified with sol–gel-based silica coating as intermediate buffer layer followed by NaA zeolite seed (prepared hydrothermally at 85 °C for 3 h) coating with 2 wt% aqueous dispersion. The secondary crystallization of NaA zeolite in the silica-seed-coated supports was carried out hydrothermally through crystal growth process at 65 °C for 4 and 8 h (single-stage each), (6 + 4) and (6 + 6) h (double-stage each), and (6 + 4 + 2) and (6 + 4 + 4) h (triple-stage each). The crystallization behaviours of the prepared NaA membranes were studied by X-ray diffraction, and the microstructures of the same films were observed by field emission scanning electron microscope. The efficiency of the membranes was tested with gas permeation study. The double-stage secondary crystallization at 65 °C for (6 + 4) h showed highly interlocked NaA grains in the membrane and it rendered the permeance values of 3.7 × 10−8 mol m−2 s−1 Pa−1 and 15.9 × 10−8 for single gas, nitrogen (N2) and hydrogen (H2) respectively with the ideal selectivity of 4.3.
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Acknowledgments
The authors sincerely thank the Director of the Institute for constant encouragement throughout this work. They are thankful to the Council of Scientific and Industrial Research (CSIR), Government of India, for funding to carry out the above research work in the Project No. SIP 0023. They are also thankful to the colleagues of the X-ray Characterization and Electron Microscopy Sections of the Institute for material characterizations.
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Naskar, M.K., Kundu, D. & Chatterjee, M. Effect of sol–gel-based silica buffer layer on the formation of NaA zeolite membrane. J Sol-Gel Sci Technol 64, 117–123 (2012). https://doi.org/10.1007/s10971-012-2837-0
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DOI: https://doi.org/10.1007/s10971-012-2837-0