Open AccessEffect of Na2O/SiO2 mole ratio on the crystal type of zeolite synthesized from coal fly ash
Author(s) -
D.R. Vučinić,
Igor Miljanović,
Aleksandra Rosić,
Predrag Lazić
Publication year - 2003
Publication title -
journal of the serbian chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.227
H-Index - 45
eISSN - 1820-7421
pISSN - 0352-5139
DOI - 10.2298/jsc0306471v
Subject(s) - fly ash , zeolite , mole , coal , materials science , hydrothermal circulation , mineralogy , chemistry , nuclear chemistry , chemical engineering , organic chemistry , catalysis , engineering
Coal fly ash was modified to zeolitic materials by hydrothermal treatment at 90 ?C. The zeolite synthesis was studied as a function of the mole ratio of Na2O/SiO2 in the reaction mixtures. The results showed that NaP1 zeolite is obtained when the Na2O/SiO2 mole ratio was 0.7. Hydroxysodalite is the dominant zeolite phase in modified fly ash treated with a higher Na2O concentration solution (Na2O/SiO2 = 1.3). The IR and XRD methods were used to determine the phases present in the starting sample and in the zeolitic materials.