Industrial fly ash may be used as the substrate in synthesis of zeolites. The impact of process parameter on the product is high, in relation to this, in the presented work the influence of base concentration, used in the synthesis process, was investigated. It was proved that it is possible to obtain different product of synthesis as well as different yield of synthesis with the use of differentiated concentration of the base solution. The lower pH values resulted in obtaining P1 zeolite while the use of higher concentrations was favorable for the production of sodalite.Keywords: Zeolite, fly ash, hydrothermal synthesis
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