Using catalysts in nitration offers several advantages: 1. Increased Reaction Rate: Catalysts accelerate the nitration process, making it more efficient. 2. Improved Selectivity: Catalysts can direct the nitration to specific positions on the substrate, reducing the formation of unwanted by-products. 3. Lower Energy Consumption: Catalysts lower the activation energy, which means the reaction can occur at milder conditions, saving energy. 4. Environmental Benefits: Catalysts can reduce the amount of waste and by-products, making the process more environmentally friendly.