申論題

7. (11%) In an ammonia decomposition reaction to generate N₂ and H₂ on a Platinum catalyst (2NH₃ → N₂ + 3H₂) the rate can be expressed as -r = kK_AP_A/K_HP_H, where k is the rate constant, P_A and P_H indicate the pressures of ammonia and hydrogen, and K_A and K_H are the adsorption constants for ammonia and hydrogen. Suggest a mechanism and the assumptions consistent with the rate equation and prove it.