KINETIC-STUDY OF THE CLAUS REACTION AT LOW-TEMPERATURE USING GAMMA-ALUMINA AS CATALYST

A kinetic study of the oxidation on H2S on gamma-alumina by SO2 follow ing a modified Claus process at low temperature (373-473 K) was carrie d out. To the analytical data, at varying SO2 and H2S concentrations, several Langmuirian type expressions for the reaction rate were applie d. The models were submitted to statistical and physical criteria to e stablish the best fitting of the experimental results. The resulting k inetic expression applied to sulphurized surfaces shows the chemical r eaction between adsorbed species -one of them H2S dissociatively adsor bed- as the controlling step of the process. The reaction was also eff ected under integral regime, the obtained results confirming the valid ity of the proposed kinetic expression.