KINETICS OF CATALYTIC REACTION OF METHANE AND HYDROGEN-SULFIDE OVER MOS2

The reaction of methane and hydrogen sulphide over MoS2 catalyst has b een studied in a fixed bed tubular reactor over a temperature range of 973 to 1073 K under atmospheric pressure and for space time between 0 .1 and 1 s. The Langmuir-Hinshelwood-Hougen-Watson theory has been use d to determine eighteen (18) rival kinetic models. Model discriminatio n has been performed by using statistical and thermodynamic constraint s. According to the proposed model, the rate-controlling step is the r eaction among the absorbed species CH3, H2S and S on the catalytic sur face with the participation of three catalytic sites. The catalyst sel ectivity is also discussed. (C) 1997 Elsevier Science B.V.