The kinetics of the water-gas shift reaction over an iron oxide-based catalyst has been studied. The experiments were performed in a glass recycle reactor at approximately atmospheric pressure. The temperature dependence of the reaction and the activation energy were determined in conjunction with a study of the diffusional limitations of different size catalyst. The statistical procedure proposed by Box for experimental design and analysis of data in order to discriminate among the rival models was used in the experimental program. A number of representative models were examined, and it was found that only the Langmuir-Hinshelwood and the power-law models could adequately describe the reaction behavior over the temperature and concentration ranges investigated. In addition, some existing data from the literature were reexamined in the same manner as used here.

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