Catalytic converters on automobiles are designed to minimize the NO and CO emissions derived from the engine exhaust. They generally operate between 400°C and 600°C at 1 bar of pressure. K.C. Taylor (1993. Cat. Rev. Sci. Eng. 35:457.) gives the following compositions (in ppm, molar basis) for typical exhaust from the engine:

The additional products of the effluent stream include NO₂, N₂O, N₂O₄, and NH₃. Estimate the compositions of all species at each temperature {400°C, 500°C, 600°C} and plot the ratio of NH₃/CO as a function of temperature.

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NO CO 0₂ CO2 N₂ 1050 6800 5100 135000 724000 2300 125000 750 H₂ H₂O hydrocarbons(-propane)