This is far from reality. A catalyst changes the rate of reaction by providing an alternate pathway for the reaction. Catalysts actively participate in one step and become changed chemically, but in a subsequent step this change is undone so it returns to its original condition. Consequently, there is no net change in the amount of catalyst present, even though it is working very hard in the reaction. Catalytic converters use metals such as platinum and rhodium to convert these to CO2, H2O, and N2.
Heterogeneous catalysis gives opportunity to look at zero-order reactions.
Note this is a linear equation. In catalytic converters, the rate of reaction is controlled by the available surface of the metal catalyst. Once the surface is completely filled by the reactant, then the rate of reaction is a constant, and t he reaction is zero-order in reactant. Adding more reactant at this point does not affect the rate. For an experiment on the zero-order decomposition of ammonia on a tungsten catalyst, a time of 32 minutes is required for an initial concentration of ammonia of 0.500 M, to change to 0.150M. a.