Silver(1) catalyzed oxidation of aspartic acid by cerium(1V) was studied in acid perchlorate medium. The stoichiometry of the reaction is represented by the eq. (i)Dimeric cerium(IV) species has been indicated and employed in calculations of monomeric cerium(IV) species concentrations. The reaction is second-order and uncatalyzed reaction also simultaneously occurs along with the silver(1) catalyzed reaction conforming to the rate law (ii)where k is an observed second-order rate constant. A probable reaction mechanism is suggested. 0 1995
The kinetics of oxidation of N-methyl-p-aminophenol (metol) by H20 2 in the presence of trace levels ofFe m have been studied in an HC104 medium. The reaction mechanism is complex and the catalytic role of Fe nl in the sulphato form is indicated. The following rate law accounts for the experimental observations: --d[HzO2]/dt = /<;in 4-K 1 K2 [metol] [H202] [Fe 3 +] (k 1 + kzl-metol] ) 1 + Kl[metol] + K~K2Emetol] [H202]where kiun is the initial rate for the uncatalysed reaction. The equilibrium constants K1 and K 2 are the formation constants for the complexes [Fe(metol)l 3+ and [Fe-(metol)(H202)] 3 +, respectively. The catalytic role of Fem is explained by considering a ternary complex in the transition state.
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