Akademik Veri Yönetim Sistemi
JOURNAL OF CRYSTAL GROWTH, cilt.355, sa.1, ss.8-12, 2012 (SCI-Expanded)
In this study, the influence of polyelectrolytes on the crystallization of zeolite Y is investigated. The prepared synthesis mixtures are aged at room temperature for 24 h and then left to crystallize. The compositional and structural information are provided by elemental analysis obtained by ICP, X-ray diffraction spectroscopy (XRD), scanning electron microscopy (SEM), particle size analyzer and adsorption and desorption isotherms of nitrogen by a volumetric adsorption instrument. The first group of synthesis studies is conducted by using solutions containing no additive (WA), nonionic (NI), 100% anionic (100A), and 100% cationic (100C) polyelectrolytes. The crystallization temperature and crystallization time are kept at 100 degrees C and 48 h, respectively. The experimental results show that nonionic polyelectrolyte has the most influence on the crystallization of zeolite NaY. In the second group of synthesis studies, the effects of polyelectrolytes with various degrees of anionic properties (10%, 50% and 70%) of the same chemical structure are investigated by conducting crystallization experiments at 100 degrees C for a duration of 48 h. The results suggest that; particle size, crystallinity and BET surface area (S-BET) can be controlled by adding anionic polyelectrolytes to the solution. (C) 2012 Elsevier B.V. All rights reserved.