The emissions of nitric oxide and carbon monoxide from internal combustion engines are of primary concern due to their impact on the environment and people's health. Since rhodium has proven to be an important catalyst for the reduction of nitric oxide by carbon monoxide, its accurate modeling is of significant value to industry. This paper reviews the literature with respect to this interaction in order to explain the history of the detailed reactions occurring on the surface. This review was accomplished in the absence of other species in order to focus the efforts and reduce the complexity of the task. In addition, this work presents an appropriate global reaction expression based on these detailed reactions for use in one-dimensional aftertreatment catalyst models.