1. Active Sites: These are the regions of the catalyst where the chemical reaction takes place. They can be metals, metal oxides, or other materials with catalytic activity. 2. Supports: These materials provide a structure for the active sites and can influence the overall performance of the catalyst. Common supports include silica, alumina, and carbon-based materials. 3. Promoters: These are additives that enhance the activity, selectivity, or stability of the catalyst. They can be elements such as potassium or barium added in small amounts.
