In heterogeneous catalysis, the reaction kinetics take on the so called LangmuirHinshelwood form. That is, the rate of reaction of component A is given by r(CA,CB)=1+KACA+KBCBkCACB where CA and CB represent the concentrations of reactants A and B, which are both functions of time. The rate constant k and adsorption equilibrium constants KA and KB do not vary with time. Linearize equation about the steady state operating points CA,CB