Journal of Engineering and Technological Sciences
Vol 47, No 6 (2015)

Synthesis of NaY Zeolite Using Mixed Calcined Kaolins


Subagjo, Subagjo ( Chemical Engineering Program, Bandung Institute of Technology, Jalan Ganesha 10 Bandung 40132, Indonesia ) , Rahayu, Endang Sri ( Chemical Engineering Program, Bandung Institute of Technology, Jalan Ganesha 10 Bandung 40132, Indonesia ) , Samadhi, Tjokorde Walmiki ( Chemical Engineering Program, Bandung Institute of Technology, Jalan Ganesha 10 Bandung 40132, Indonesia ) , Gunawan, Melia Laniwati ( Chemical Engineering Program, Bandung Institute of Technology, Jalan Ganesha 10 Bandung 40132, Indonesia )



Article Info

Publish Date
31 Dec 2015

Abstract

Kaolin is one of several types of clay minerals. The most common crystalline phase constituting kaolin minerals is kaolinite, with the chemical composition Al2Si2O5(OH)4. Kaolin is mostly used for manufacturing traditional ceramics and also to synthesize zeolites or molecular sieves. The Si-O and Al-O structures in kaolin are inactive and inert, so activation by calcination is required. This work studies the conversion of kaolin originating from Bangka island in Indonesia into calcined kaolin phase as precursor in NaY zeolite synthesis. In the calcination process, the kaolinite undergoes phase transformations from metakaolin to mullite. The Bangka kaolin is 74.3% crystalline, predominantly composed of kaolinite, and 25.7% amorphous, with an SiO2/Al2O3 mass ratio of 1.64. Thermal characterization using simultaneous DSC/TGA identified an endothermic peak at 527°C and an exothermic peak at 1013°C. Thus, three calcination temperatures (700, 1013, and 1050 °C) were selected to produce calcined kaolins with different phase distributions. The best product, with 87.8% NaY zeolite in the 54.7% crystalline product and an SiO2/Al2O3 molar ratio of 5.35, was obtained through hydrothermal synthesis using mixed calcined kaolins with a composition of K700C : K1013C : K1050C = 10 : 85 : 5 in %-mass, with seed addition, at a temperature of 93 °Cand a reaction time of 15 hours.


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Journal Info

Abbrev

JETS

Publisher

Subject

Engineering

Description

Journal of Engineering and Technological Sciences welcomes full research articles in the area of Engineering Sciences from the following subject areas: Aerospace Engineering, Biotechnology, Chemical Engineering, Civil Engineering, Electrical Engineering, Engineering Physics, Environmental ...