Abstract
Calcium zeolite type A (CaNaAlSi2O7), called soda melilite, with a molar ratio of CaO:Al2O3:Na2O:SiO2 of 1:1:2:8 and calcined at 300 °C for 1 h was successfully synthesized by a sol–gel process using eggshell as the starting material. The CaNaAlSi2O7 catalysts had N2 adsorption–desorption isotherms and good electrical properties. The specific surface area, pore volume, and average pore diameter were 55.15 m2/g, 0.51, and 37.19 nm, respectively. The dielectric constant, electrical conductivity, and loss tangent are 46.5785, 5.2360 × 10−3 (Ω m)−1, and 2.75, respectively as measured at room temperature and at 1000 kHz (1 MHz). The transmission electron microscopy (TEM) images showed a moderately good dispersion of uniform particles with an average diameter of about 0.5 nm. X-ray diffraction patterns (XRD), Fourier transform infrared spectra, and simultaneous thermal analysis data (STA) were obtained to confirm the synthesis products.
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Acknowledgements
The authors would like to thank the following: The Petroleum and Petrochemical College, the Department of Geology, Faculty of Science, and the Scientific and Technological Research Equipment Centre, at Chulalongkorn University; the Departments of Materials Engineering and Physics, at Kasetsart University for the use of their analytical equipment. We are also grateful for the grant support from the Kasetsart University Research and Development fiscal year 2009. As would like to acknowledge the financial support from the Conductive and Electroactive Polymers Research Unit, the Thailand Research Fund (TRF-BRG), and the Royal Thai Government (Budget of Fiscal Year 2552).
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Tangboriboon, N., Wongkasemjit, S., Kunanuruksapong, R. et al. An Innovative Synthesis of Calcium Zeolite Type A Catalysts from Eggshells via the Sol–Gel Process. J Inorg Organomet Polym 21, 50–60 (2011). https://doi.org/10.1007/s10904-010-9413-2
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DOI: https://doi.org/10.1007/s10904-010-9413-2