Replicates are essential for several reasons: 1. Reproducibility: Ensures that the results can be consistently replicated under the same conditions. 2. Error Minimization: Helps in identifying and minimizing random errors. 3. Statistical Validity: Provides a basis for statistical analysis, making the results more robust and credible. 4. Variability Assessment: Allows researchers to assess the variability in the catalytic performance, which is essential for understanding the behavior of the catalyst under different conditions.