KINETICS OF THE CATALYTIC REACTION OF METHANE AND HYDROGEN-SULFIDE OVER A PT-AL2O3 CATALYST

The reaction of methane and hydrogen sulphide over a Pt-Al2O3 catalyst has been studied in a fixed bed tubular reactor over a temperature ra nge of 973 to 1073 K under atmospheric pressure and for space times be tween 0.1 and 1 s. The Langmuir-Hinshelwood-Hougen-Watson theory has b een employed to obtain eighteen (18) rival kinetic models. The kinetic parameters are determined for all models and discrimination of the pr evailing model is attempted by using statistical and thermodynamic con straints. According to that model the rate-controlling step is the rea ction between one chemisorbed CH2 and two S on the catalytic surface w ith the participation of three catalytic sites.