Hydrothermal Synthesis of High Crystalline Silicalite from Rice Husk Ash

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. © 2015 chaiwat kongmanklang and kunwadee rangsriwatananon.