Catalytic and electrocatalytic oxidation of aniline to nitrobenzene over vanadium silicate molecular sieves: VS-1 usingt-butyl hydroperoxide (TBHP) as oxidant |
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| Authors: | T Selyam M P Vinod and K Vijayamohanan |
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| Institution: | (1) Catalysis Division, National Chemical Laboratory, 411 008 Pune, India;(2) Physical Chemistry Division, National Chemical Laboratory, 411 008 Pune, India |
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| Abstract: | A comparison of the results of catalytic and electrocatalytic oxidation of aniline using VS-1 in the presence of H2O2 and TBHP indicates remarkable differences in conversion and selectivity. VS-1 catalyzes the oxidation of aniline selectively
to nitrobenzene (73%) in the presence oft-butyl hydroperoxide (TBHP), while azoxybenzene (95.2%) is formed selectively when H2O2 is used. Cyclic voltammetric studies show a three-step oxidation of aniline to nitrobenzene in H2O2 but in the presence of TBHP only one step is observed. Electrocatalytic oxidation of aniline to nitrobenzene occurs at a
potential 700 mV less than that corresponding to H2O2 as oxidant along with a selectivity of 91.8%. The enhancement of electrocatalytic rate is attributed to the stabilization
of electron deficient transition state. |
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| Keywords: | Aniline oxidation with VS-1 catalytic and electrocatalytic oxidation of aniline |
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