from first principles PP-I-1

PP-III-115Phenol Oxydation by PP-CWAO Treatment with Cu/13XWittine O., Matijašević L.J., Zrnčević S.University of Zagreb, Faculty of Chemical Engineering and Technology, Department ofReaction Engineering and Catalysis, Marulićev trg 19, 10000 Zagreb,Croatiaszrnce@fkit.hrWater pollution is characterized mainly by the volume of waste to be treated and by thenature, concentration and toxicity of pollutants that form it. These parameters are all factorsthat have to be taken into account when choosing the treatment method to use. WAO (WetAir Oxidation) is a phenol oxidation treatment method based on oxidation with air or oxygen,and is conducted at elevated temperatures (373-573 K) and pressures (1 - 20 MPa). Withaddition of homogeneous or heterogeneous catalysts, WO processes can be carried out atlower pressures and temperatures. If these processes use hydrogen peroxide as oxidizingagent, the process is called CWPO (Catalytic Wet Peroxide Oxidation), in which treatment iscarried out at atmospheric pressure and temperatures below 373 K. To take advantages of theCWPO & CWAO process, and maximize the effectiveness of treatment, in this work, mixtureof both oxidants (oxygen and hydrogen peroxide) was used.Activity of synthesized and calcined Cu/13X catalyst was tested in the PP-CWAO (PeroxidePromoted Catalytic Wet Air Oxidation) reaction using batch reactor. The catalysts werecharacterized by different methods (XRD, AAS, BET surface area). The catalytic tests werecarried out in a stainless steel Parr reactor in batch operation mode at the constant catalystmass (0.1 g / 200 cm-3), different temperatures (333 - 353K) and air pressures (2 - 20 bar).The initial concentration of phenol was 0.01 mol dm -3 while the concentration of hydrogenperoxide varied from 0.01 mol dm-3 to 0.14 mol dm -3 .Based on the results it has been concluded that the PP-CWAO process leads to higherpollutant removal conversions than the CWAO and CWPO processes. The results wereinfluenced by the Ph: H 2 O 2 : air molar ratio. A synergistic effect was found when H 2 O 2 iscombined with air which leads to higher mineralization of the phenol.The stability measurements showed that thermal treatment stabilizes the Cu/13X catalyst fromleaching.275