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    STUDIA CHEMIA - Issue no. 3 / 2008  
         
  Article:   FE/ZVT CATALYSTS FOR PHENOL TOTAL OXIDATION.

Authors:  ANDRADA MĂICĂNEANU, MARIA STANCA, SILVIA BURCĂ, HOREA BEDELEAN. 		 
       
         
  Abstract:   Zeolitic volcanic tuffs collected from Aluniş (A-ZVT) area (Cluj County, Romania) modified by ionic exchange with iron ions were tested, as catalysts, in the wet air oxidation process in order to remove phenol from synthetic wastewaters. The zeolitic volcanic tuff samples used as support for the oxidation catalysts were characterised by means of optical microscopy, scanning electron microscopy (SEM), X ray diffraction (XRD), chemical analysis and Fourier transformed infrared spectroscopy (FTIR). In order to realize phenol catalytic wet air oxidation we used a synthetic solution containing 1g phenol/dm3 (100 cm3), which was contacted with 4 grams of Fe/ZVT catalyst in a batch reactor with magnetic stirring. Air was introduced in the reactor using a glass frit at different flow rates. Effect of reaction conditions, temperature and air flow rate, over the phenol conversion and the overall efficiency of the oxidation process were investigated. With the increase of temperature and air flow rate we observed an increase of the oxidation process efficiency. Activation energy was also calculated.

Keywords: zeolitic volcanic tuff, clinoptilolite, wastewaters, phenol, catalytic wet air oxidation (CWAO) 		 
         
     
         
         
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