To construct a conversion vs. time plot, you need to: 1. Conduct Experiments: Perform catalytic reactions and measure the concentration of reactants and products at various time intervals. 2. Calculate Conversion: Use the formula \( X = \frac{C_0 - C_t}{C_0} \), where \( C_0 \) is the initial concentration of the reactant, and \( C_t \) is the concentration at time \( t \). 3. Plot Data: Plot the conversion (X) on the y-axis and time (t) on the x-axis.