Synthesis and Characterization of Sodalite and Cancrinite from Kaolin
Fabiano Augusto Costa Mafra PassosDanielle C. CastroKaroline K. FerreiraKarla Mayara Arguelles SimõesLuíz Carlos BertolinoCarla Napoli BarbatoFrancisco Manoel dos Santos GarridoAdriana A. S. FelixFernanda Arruda Nogueira Gomes da Silva
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Keywords:
Sodalite
Metakaolin
Hydrothermal Synthesis
Thermogravimetry
Polycrystalline MFI zeolite membranes were prepared on �-alumina tubular support by hydrothermal treatments at 413 K. The synthesized zeolite membranes were characterized by XRD, SEM and single gas permeation. The influence of hydrothermal treatment steps and the calcination time on the zeolite layer formation were investigated. MFI zeolite membrane prepared by four subsequent hydrothermal treatments and calcined at 673K for 30 h had optimum quality from morphological and crystalline point of view. The grown MFI zeolite layer was uniform with about 20 µm thickness and well-intergrown zeolite crystals.
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Hydrothermal Synthesis
Seed crystal
Morphology
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Zeolite A and zeolite X was successfully synthesized from natural kaolin from Lampang province using calcination and two-step method of hydrothermal under the optimum conditions. Firstly, metakaolin was achieved by calcining the kaolin at 700 °C for 2 h. Secondly, hydrothermal experiments can be separated into two steps, the high temperature and short time of hydrothermal, metakaolin was mixed with NaOH to form hydrous sodium aluminosilicate, which was dissolved in dilute HCl. After the filtration, adjusted with deionized water to pH = 7 to form an amorphous aluminosilicate gel. Low temperature and longtime of hydrothermal, aluminosilicate gel was mixed with NaOH to form zeolite A and zeolite X. The optimum conditions for synthesis zeolite A is the high temperature and short time of hydrothermal with NaOH 8 M at 200 °C for 3 h and low temperature and longtime of hydrothermal with NaOH 1 M at 90 °C for 72 h. The optimum conditions for synthesis zeolite X is the high temperature and short time of hydrothermal with NaOH 8 M at 200 °C for 3 h and low temperature and longtime hydrothermal was NaOH 1 M at 90 °C for 120 h. The characterization of zeolite A and zeolite X were examined by x-ray diffraction (XRD), scanning electron microscopy (SEM), and infrared spectroscopy (FT-IR). Keywords: Zeolite A, zeolite X, Kaolin, Hydrothermal, Kaolin
Metakaolin
Hydrothermal Synthesis
Sodium aluminosilicate
Sodalite
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Metakaolin
Hydrothermal Synthesis
Sodalite
Tobermorite
Analcime
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Sodalite
Hydrothermal Synthesis
Characterization
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Hydrothermal Synthesis
Selective catalytic reduction
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The gangue was taken as the main material to synthesize P-type zeolite by hydrothermal crystallization after calcination and alkali melting,The optimum conditions were obtained by orthogonal experiments,they were: n(SiO2)/n(Al2O3)=3.3,n(Na2O)/n(SiO2)=1.3,n(H2O)/n(Na2O)=60,aging at 60 ℃for 3 h and hydrothermal crystallization at 93 ℃ for 7 h.The products were detected as pure P-type zeolite by XRD and SEM test.
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Gangue
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Secondary growth
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Hydrothermal Synthesis
Hydrothermal reaction
Particle (ecology)
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Sodalite
Hydrothermal Synthesis
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