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Catalytic screening of transition metal zeolite based catalysts in cwpo of model and real phenolic wastewater

Several copper containing zeolite based catalysts with different initial Si/Al and different zeolite support (types MCM-22, FAU, BETA) were synthesized or prepared from commercial precursors in powdered and pelleted form via direct hydrothermal synthesis and ion exchange metod, and then subsequently characterized for evaluation of their chemical and surface as well as catalytic properties. Characterization of the zeolites, that included analysis of their morphological and acid-base properties, was performed using various techniques such as N2 physisorption, Pyridine-FTIR, XRD, SEM-EDAX and TEM. The activity and stability of prepared catalysts was tested in the catalytic screening in catalytic wet peroxide oxidation of model polyphenolic wastewater. The obtained results provided an insight into cause-and-effect relationship between silica to alumina ratio and its direct effect on the acidity and basicity of the prepared zeolites as well as the indirect one on their morphology, textural and surface propertiesof both parent zeolite and active metal component. The use of active catalysts resulted in successfully operating the process under mild conditions with low energy consumption. It was found that copper and iron containing catalysts showed promising activity, while the stability of the active metal component still is and remains a challenge to obtain.

zeolites, acidity, transition metals, morphology, surface properties

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