478690 Synthesis and Characterization of Zeolite from Fly Ash

Monday, November 14, 2016
Grand Ballroom B (Hilton San Francisco Union Square)
Daniel A. Leal Moreno, Department of Chemical engineering, Universidad Nacional de Colombia - Sede Bogotá, Bogotá, Colombia

Title: Synthesis and characterization of zeolite from fly ash
 

Autors: Daniel Andrés Leal Moreno1* Jose Herney Ramirez Franco 2.

1* Student of chemical engineering – Universidad Nacional de Colombia sede Bogotá (e-mail:dalealm@unal.edu.co)

2 Profesor of chemical engineering – Universidad Nacional de Colombia sede Bogotá

Abstract

The fly ash is the principal waste from different combustion processes that use charcoal as the main source of energy, the fly ash has become a problem due his high production rate, in Colombia this amount is approximately 1500 ton per day and it not has a properly storage. A possible solution to this problem comes from the composition of the fly ash that shows an important percentage of aluminum and silicon, this property let us study the use of this remainder to obtain different kind of zeolites, they are aluminosilicates structures that could be used as catalytic supports, catalysts, molecular sieves and ion exchangers.

This paper introduces the process of synthesis of zeolite X from fly ash, provided for the thermoelectric Termotasajero (Cucuta, Colombia). First of all, the analysis of the fly ash composition shows a ratio Al/Si = 1,2; for this reason after the process happens is expected a zeolite X, Y or P.

This treatment gives the fly ash a add value and let it be part of others products, changing the classification of waste to raw material on the production of zeolites.

The process begins mixing the fly ash with NaOH because the transformation of the fly ash is produced on the alkaline fusion of the Al, Si and Na; and the hydrothermal treatment that follows it, the variation on the time and the temperature in this treatment shows a difference on the zeolite obtained.

The zeolite obtained is characterized with different techniques as X ray fluorescence (XRF), X ray diffraction (XRD), scanning electron microscope (SEM), to make sure the transformation of the fly ash into zeolite X. Another proves as cation exchanger capacity (CEC) and termogravimetric analysis (TGA) give us the characteristics to search the application.


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