Open AccessSINTESIS DAN KARAKTERISASI FAUJASIT DARI ABU LAYANG : Kajian Pengaruh Waktu Sintesis Terhadap Stabilitas Termal Struktur Faujasit (Kinetics of Faujasite Formation from Fly Ash)
Author(s) -
Sutarno Sutarno,
Arief Budyantoro
Publication year - 2019
Publication title -
jurnal ilmiah sains dan teknologi
Language(s) - English
Resource type - Journals
ISSN - 0216-1540
DOI - 10.24123/jst.v2i2.2249
Subject(s) - faujasite , fly ash , zeolite , materials science , mullite , sodalite , amorphous solid , nuclear chemistry , thermal stability , chemical engineering , chemistry , mineralogy , metallurgy , organic chemistry , composite material , catalysis , ceramic , engineering
Faujasite was hydrothermally synthesized from fly ash at 100oC in alkaline solution by reflux with 5M HCl and fusion with NaOH (weight ratio of NaOH/fly ash = 1.2) pretreatments. Kinetics of faujasite formation was performed by variation of hydrothermal time (0-120 hours). Thermal stability of faujasite from fly ash was tested at 400-900oC and was compared with commercial zeolite Y. The solid products were characterized by X-ray diffraction method. Results showed that faujasite was formed through dissolution of fly ash components such as quartz, mullite and amorphous aluminosilicates (0-3 hours) followed by crystallization to form faujasite (6-48 hours). In longer hydrothermal time (48-72 hours), faujasite transformed into zeolite P and completely formed hydroxysodalite after 120 hours. X-ray diffraction pattern showed that thermal stability of faujasite from fly ash was relatively lower than that of commercial zeolite Y. Faujasite from fly ash transformed into amorphous phase at 800oC whereas commercial zeolite Y transformed into amorphous phase at 900oC.