CO hydrogenation reaction over nano structured Fe-Ni-Mn catalyst: Kinetic and mechanistic studies

The objective of present work is the kinetic and mechanistic studies of the Fischer-Tropsch synthesis in a fixed bed micro reactor; over the nano structured Fe-Ni-Mn catalyst prepared by the solvothermal procedure. Operating conditions within the reactor were varied as follows: T = 270-340 degrees C, P = 1.2 -7.0 bar, H-2/CO feed ratio = 0.5-2.0 and GHSV = 4200 h(-1). Based on Langmuir-Hinshelwood-Hogan-Watson and Eley-Rideal adsorption theories in catalytic processes, thirty-five rate expressions for CO consumption were tested and interaction between dissociative adsorbed carbon monoxide and associative adsorbed hydrogen as the rate-determining step gave the best fitted kinetic model (-r(CO) = kP(CO)P(H2)/(1+2(b(CO)P(CO))(0.5) + b(H2)P(H2))(3). The Levenberg Marquardt algorithm was used to estimate the kinetic parameters and the activation energy and heat of adsorption of CO and H-2 were 70.43, -57.72 and -11.52 kJ/mol, respectively. Characterization of catalysts was performed using different techniques including XRD and BET. (C) 2016 Elsevier B.V. All rights reserved.