Synthesis of NaY Zeolite Molecular Sieves from Calcined Diatomite

Abstract:

NaY zeolite molecular sieves have been synthesized using diatomite as a main starting material via a hydrothermal method. In this approach, the mixture of diatomite and Na₂CO₃ in mass ratio of 1.0/1.46 was first calcined at temperature of 830 °C for about 1.5 h. The calcined materials were then dissolved in water to obtain a solution and the composition is 15.1 Na₂O : 1 Al₂O₃ : 11.5 SiO₂ : 832 H₂O. The solution was used to synthesize NaY zeolite by the crystals seeds (27.76Na₂O·1.00Al₂O₃·25.07SiO₂·305.66H₂O) via hydrothermal treatment. The hydrothermal temperature is 100 °C and the percentage of added crystal seeds is 10% (volume) relative to calcined materials. The obtained zeolite was identified by X-ray diffraction (XRD), and was characterized by scanning electron microscope (SEM), transmission electron microscope (TEM) and nitrogen sorption analysis, which showed that a high yield of NaY type with a high crystalinity was obtained.

• Periodical: Advanced Materials Research (Volumes 236-238)
• Pages: 362-368
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.236-238.362
• Online since: May 2011
• Authors: Jin Hong Li, Zhen Qing Chi, Hui Fen Chen
• Keywords: Calcined Diatomite, Hydrothermal Method, Nay Zeolites, Synthesis

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