In situ gravimetric measurements were used to study oxygen removal from (or incorporation into) chromia-promoted magnetite in CO2/CO and H2O/H2 gas mixtures at 637 K. The equilibrium and kinetic data could be described by two reversible, oxidation-reduction reactions: surface-oxygen removal by CO and surface oxygen replenishment by H2O, with the corresponding reverse reaction involving CO2 and H2. These reactions form a regenerative mechanism that is able to predict qualitatively both the measured rate and rate expression for water-gas shift. It is concluded that this regenerative mechanism is a primary pathway for water-gas shift over magnetite.
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