An Innovative Synthesis of Calcium Zeolite Type A Catalysts from Eggshells via the Sol–Gel Process |
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Authors: | Nuchnapa Tangboriboon Sujitra Wongkasemjit Ruksapong Kunanuruksapong Anuvat Sirivat |
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Affiliation: | (1) Department of Materials Engineering, Faculty of Engineering, Kasetsart University, Bangkok, 10900, Thailand;(2) The Petroleum and Petrochemical College, Chulalongkorn University, Bangkok, 10330, Thailand; |
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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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