Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9693959 | Thermochimica Acta | 2005 | 11 Pages |
Abstract
This paper deals with an experimental batch mode study of a chemical homogeneous reaction: the dichromate-catalysed hydrogen peroxide decomposition. The thermodynamic properties and the kinetic parameters of the reaction are simultaneously determined using a calorimetric approach. Various batch-operating modes (adiabatic, isoperibolic, or differential thermal analysis) are compared and it is shown that the determined parameters do not depend on the operating mode. A complete kinetic law is proposed. The reaction rate constant is assumed to follow the Arrhenius rate law. The Arrhenius parameters are determined as frequency factor k0Â =Â 1.39Â ÃÂ 109Â sâ1 and activation energy EÂ =Â 54.9Â kJÂ molâ1. The measured enthalpy of reaction is ÎrHÂ =Â â94Â kJÂ molâ1. The reaction order is between 0 and 2 in hydrogen peroxide according to operating conditions and depends linearly on the initial dichromate concentration. The reaction can be managed by two parameters: on one hand the released reaction heat directly depends on the hydrogen peroxide concentration, and on the other hand, the kinetic rate can be increased in increasing the dichromate concentration.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Nader Frikha, Eric Schaer, Jean-Léon Houzelot,