| A new technique, which combined the Berty internal recycle reactor with low-metal loading monolithic catalysts, was developed to measure the intrinsic kinetics of CO methanation. Kinetic data were measured for H(,2)/CO ratios of 3 over the temperature range from 473 to 623 K. Data from various other studies were correlated with data from this study. Both power law and Langmuir-Hinshelwood rate expressions were fit to the kinetic data. While one of the reaction products, CH(,4), had no effect on the reaction rate, the other, H(,2)O, showed increasing inhibition with increasing temperature. At higher pressures, the effects of catalyst deactivation became more significant. Thus, the kinetics of deactivation by carbon were determined and correlated with a meaningful physical model, which assumed the rate-determining step for carbon deposition to be the transformation from (alpha)-carbon to (beta)-carbon. |
