Abstract:
Zeolites are aluminosilicate microporous crystals with intrinsic properties of acidity, high surface area, high thermal stability, and shape selectivity. Synthetic zeolite is engineered to obtain a better character than natural zeolite. High Silica synthetic zeolite is hydrophobic. It can interact with non-polar molecules. This study aims to determine the effect of hydrothermal time on the character of high silica Sodalite. The synthesis is preceded by a sodium aluminate solution reacted with sodium silicate at a Si/Al 20 mole ratio. The gel was heated using the hydrothermal method in an autoclave at 200 °C for 12, 18, 24, and 48 hours. Furthermore, the hydrothermal product was neutralized, dried, and analyzed using X-ray Diffraction (XRD) and Fourier Transform InfraRed (FTIR). The FTIR analysis shows that all products of hydrothermal time variations have O-T-O bending vibration absorption at wavenumber 500-420 cm-1 and Single four-ring (S4R) at 650-500 cm-1. Internal asymmetric stretching vibrations of O-Si-O or O-Al-O at wavenumbers 1250-950 cm-1. Based on FTIR deconvolution, the increase in hydrothermal time causes the Si-OH/Si-O-Si ratio to decrease, which indicates an increase in hydrophobicity. The XRD analysis showed that the hydrothermal time products of 12 and 18 hours were still amorphous, while the hydrothermal times of 24 and 48 produced crystalline products, but the intensity was still low.
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