The forward and reverse water-gas-shift (WGS)-reactions over 2%Pt/CeO2 catalyst are studied under steady-state conditions using a procedure which entails adjusting feed gas concentrations to cycle back and forth across the equilibrium line. The kinetic data were collected on "both sides" of the equilibrium under varying feed gas compositions (CO and CO2 concentrations) and temperatures. The obtained data are interpreted using the concept of the apparent "kinetic resistance" developed recently based on the original non-linear theory [see Lazman, M.Z., Yablonsky, CS., 2008. Overall reaction rate equation of single-route complex catalytic reaction in terms of hypergeometric series. Advances in Chemical Engineering 34, 47-102]. (C) 2009 Elsevier Ltd. All rights reserved.