Hydrothermal Synthesis of High Crystalline Silicalite from Rice Husk Ash

Abstract EN

The objective of this research work was to evaluate the hydrothermal synthesis of silicalite with high crystallinity within a small particle size.

The current study focused on investigating the effects of silica sources such as rice husk ash (RHA) and silica gel (SG), crystallization time, and ratios of NaOH/SiO2, H2O/NaOH, and SiO2/TPABr.

The crystallinity, particle size, and morphology were characterized by FT-IR, XRD, particle size analyser, and SEM.

The conclusion of the main findings indicated that the XRD patterns of these samples clearly showed a pure phase of MFI structure corresponding to FT-IR spectra with vibration mode at 550 and 1223 cm−1.

The highest crystallinity was obtained at reaction time only 6 hours with the mole ratios of NaOH/SiO2, H2O/NaOH and SiO2/TPABr as 0.24, 155, and 30, respectively.

When SG was used as a silica source, it was found that the particle size was smaller than that from RHA.

The morphologies of all silicalite samples were coffin and cubic-like shape.