Alizadeh - Department of Chemical Engineering, Center of Petrochemical Excellency, Amirkabir University of Technology (Tehran polytechnic), Tehran, ۱۵۸۷۵-۴۴۱۳, Iran
Jamshidi - Department of Chemical Engineering, Center of Petrochemical Excellency, Amirkabir University of Technology (Tehran polytechnic), Tehran, ۱۵۸۷۵-۴۴۱۳, Iran
Ale Ebrahim - Department of Chemical Engineering, Center of Petrochemical Excellency, Amirkabir University of Technology (Tehran polytechnic), Tehran, ۱۵۸۷۵-۴۴۱۳, Iran

This article describes kinetic modeling of the reduction of barium sulfate by methane based on experimental data obtained by thermogravimetric technique. Also in this study the catalytic effect of zinc oxide on the reduction reaction was investigated and kinetic parameters of reaction were evaluated both in the absence and presence of catalyst. The conversion-time data have been interpreted by using the grain model for gas-solid reactions and the effect of catalyst on the kinetic parameters has been elucidated. It was found that zinc oxide acted as fairly strong catalyst for the reaction, especially at higher temperatures. At about 975°C the reaction rate constant was increased more than 7 times by using 2 percent of zinc oxide. This enhancement in the rate constant is valuable for industries. Orthogonal collocation method was used for solving coupled partial differential equations of gas-solid reaction. There is a good consistency between the grain model and experimental data.

modeling, barium sulfate, reduction, methane, catalyst, kinetic study