engleski

Catalytic wet peroxide oxidation of phenol over copper containing zeolites

Due to its presence in various processes in pharmaceutical, chemical and petrochemical industry, where it is used either as reagent, intermediate substance or solvent, phenol is known as one of the most common organic water pollutants. Its high toxicity and suspected mutagenic and carcinogenic properties prohibit the release of untreated phenolic wastewater into the natural recipients. Therefore, it is of the most importance to constantly develop new and improve existing technologies in order to enhance wastewater treatment processes. Low-temperature, aqueous-phase heterogeneous catalytic oxidation of dissolved organic compounds is a potential means for remediation of contaminated industrial effluents and other wastewater streams. The abatement of phenol in water can be most successfully conducted in the catalytic wet oxidation process with hydrogen peroxide as oxidant (CWPO process) [1, 2]. Using zeolites that contain copper as catalytic active sites, total degradation of phenol can be achieved under mild operating conditions at temperatures bellow 100 °C and atmospheric pressure [3-5]. In this article catalytic properties of copper containing ZSM5, Y5 and 13X zeolites were investigated in heterogeneous catalytic wet peroxide oxidation of aqueous phenolic solutions. Influence of synthesis and post synthesis methods, framework type, copper loading and reaction parameters were studied. Special attention was directed towards evaluation of catalysts' stability in terms of copper leeching into reaction mixture. Keywords: Wastewater treatment ; CWPO ; Catalyst preparation ; Cu/ZSM5 ; Cu/Y5 ; Cu/13X ; Phenol oxidation ; Kinetics ;

Wastewater treatment; CWPO; Catalyst preparation; Cu/ZSM5; Cu/Y5; Cu/13X; Phenol oxidation; Kinetics;

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