THE MICROKINETICS OF WATER-GAS SHIFT REACTION ON THE B113-2 SHIFT CATALYST

The water gas shift reaction over an industrial ferrochrome shift catalyst B113-2 was studied by steady experiments in a fixed-bed plug flow microreactor consisting of a stainless-steel tube with eliminating diffusion effect at 618~723 K and 1.0 MPa.The different dependencies of the microkinetics was evaluated by a power law kinetic model,which was found to give an excellent representation of the kinetic data.Comparatively,the activation energy of the water gas shift reaction on B113-2 catalyst is lower,which can account for the higher activation at lower temperature.The influence of H_2O on the reaction rate is greater comparing with other traditional ferrochrome shift catalysts,which may be resulted from the additional Cu component in the catalyst.The resistance effect of the CO_2 in the reaction system results in the decrease of reaction rate greatly.It′s crucial to reduce the resistance effect of the CO_2 in favor of the reaction rate.The influence of H_2 on the reaction rate can be neglected.