Síntesis y caracterización de zeolita faujasita a partir de tamo de arroz. estudio exploratorio como catalizador en la obtención de biodiesel

Abstract

In this work Faujasite zeolite NaX was synthesized from residual rice husk obtained after thrashing the grain; after alkaline treatment with NaOH a sodium silicate solution was obtained with a content of 51577.68mg/L of silicon. Aliquots of the obtained silicon solution were mixed with an aluminum solution (47245.45mg/L) in 65 mL autoclave vessels keeping a molar ratio Si/Al of 2.4. The mixtures were allowed to stand for 24 hours and right after a study of the aging process was made after 16, 24, 48, 72 and 96 hours. Samples were characterized by XRD, XRF, SEM, IR, BET, TGA and DSC. It was found that with a longer aging time the resulting Faujasite zeolite NaX structures have increased structural stability. The obtained zeolites were used as heterogeneous catalysts for the transesterification reaction of palm oil with methanol. The conversion yield ranged from 64 to 99% when KOH is supported on the zeolitic material with a 6 hours reaction time at 60°C. Finally, the used catalyst characterization by XRD and IR revealed that there is not a significant change after the reaction thus it can be reused.