Resumo

PATERNINA, Elihu; M. ARIAS, Juan  e  BARRAGAN, Daniel. Kinetic study of the catalyzed decomposition of hydrogen peroxide on activated carbon. Quím. Nova [online]. 2009, vol.32, n.4, pp. 934-938. ISSN 0100-4042.  http://dx.doi.org/10.1590/S0100-40422009000400020.

The kinetic study of decomposition of hydrogen peroxide catalyzed by activated carbon was carried out. The effect of concentrations of reactants and temperature were experimentally studied. Kinetic data were evaluated using differential method of initial rates of reaction. When a typical kinetic law for reactions in homogeneous phase is used, first order of reaction is obtained for hydrogen peroxide and activated carbon, and activation energy of 27 kJ mol^-1 for the reaction was estimated. Experimentally was observed that surface of activated carbon is chemically modified during decomposition of hydrogen peroxide, based on this result a scheme of reaction was proposed and evaluated. Experimental data fits very well to a Langmuir- Hinshelwood kinetic model and activation energy of 40 kJ mol^-1 was estimated for reaction in heterogeneous phase.

Palavras-chave : decomposition of hydrogen peroxide; initial rate of reaction; kinetic law of Langmuir-Hinshelwood.