Different types of solvents are used in catalytic processes: - Protic Solvents: These solvents, which include water and alcohols, can donate protons and are often used in acid-catalyzed reactions. - Aprotic Solvents: Solvents like acetonitrile and dimethyl sulfoxide (DMSO) do not donate protons and are suitable for reactions where proton donation is undesirable. - Non-Polar Solvents: Such as hexane and toluene, are used in reactions where polar interactions might hinder the process. - Ionic Liquids: These are salts in the liquid state, which can provide a unique environment for catalytic reactions due to their ionic nature.