Several factors influence the design of an effective catalyst: 1. Surface Area: Higher surface area allows more active sites for the reaction. 2. Pore Structure: Proper pore size distribution facilitates reactant accessibility to the active sites. 3. Active Site Composition: The nature and arrangement of active sites determine the catalystâs activity and selectivity. 4. Support Material: The choice of support material can affect the catalystâs stability and dispersion of active sites.