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    STUDIA CHEMIA - Issue no. 1-2 / 1998  
         
  Article:   A KINETIC STUDY UPON THE OXIDATION OF BENZALDEHYDE BY CERIUM(IV) IN SULFURIC ACID MEDIA.

Authors:  CLAUDIA MUREŞANU, IOAN BÂLDEA, ANA-MARIA BUDUŞAN.
 
       
         
  Abstract:  The kinetics of benzaldehyde oxidation to benzoic acid by ceric sulfate has been studied using spectrophotometrical means, in a H2SO4 Na2SO4 NaClO4 mixture. The influence of organic substrate, hydrogen ion and sulfate ion concentration as well as the effect of ionic strength upon the rate was investigated over a wide range. The kinetic study revealed the existence of two stages, each of first-order with respect to Cerium(IV). The first step involves the formation of an intermediate complex between Ce(IV) and benzaldehyde. The second step consists of the electron transfer within this 1:1 Ce(IV):benzaldehyde complex. The rate laws for both processes were found and a mechanism was suggested in accordance with the experimental results. The activation parameters for both processes were obtained.  
         
     
         
         
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