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    STUDIA CHEMIA - Issue no. 1-2 / 2000  
         
  Article:   MEDIATED ANODIC OXIDATION OF TOLUENE WITH THE CE(IV)/CE(III) SYSTEM IN SULPHURIC ACID MEDIUM.

Authors:  LIVIU ONICIU, CLAUDIA GEMMA MUREŞANU, CRISTINA G. BUCŞA. 		 
       
         
  Abstract:  The Ce(IV)/Ce(III) couple was used as a mediator to oxidize an emulsion of toluene in aqueous H2SO4 medium, on graphite electrode using a divided electrochemical cell. The only oxidation product that could be identified, was benzaldehyde. The influence of several parameters upon benzaldehyde formation was investigated. The best yield for benzaldehyde formation, under the conditions employed was about 36%. Cyclic voltammetry was used to study the Ce(IV)/Ce(III) couple. Diffusion coefficients, reaction orders with respect to Ce (IV) and Ce(III) as well as the rate constants for Ce(IV) reduction and Ce(III) oxidation were determined. Ce (IV) regeneration on graphite electrode in H2SO4 medium using a divided cell was investigated. Good yields over 80% were obtained working under best conditions we found.  
         
     
         
         
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