Kinetics and mechanism of CO2 methanation on a nickel catalyst

Department of Physics II, University of Craiova, A. I. Cuza 13, 1100 Craiova, Romania E-mail : protaru@central.ucv.ro Fax : 40-51-415077 Manuscript received 27 April 2000, revised 30 October 2000, accepted 19 February 2001 Use has been made of a perfectly stirred catalytic reactor to determine the kinetic data of CO2 methanation of Ni/Al2O3 catalyst; the data are analyzed by Hougen-Watson method. The optimal values of kinetic parameters are calculated by means of four kinetic models. Application of Boudart criteria has led to the conclusion that the process occurs according to a Langmuir-Hinslielwood mechanism with an activation energy of 57.4 kJ mol-1