<p>2,4-Toluenediamine (TDA) is an important raw material in the polyurethane industry. The current industrial production method involves a gas–liquid–solid three-phase catalytic reaction process that utilizes hydrogen directly, presenting challenges such as high safety risks and non-uniform mixing of reactants. Therefore, this paper proposes and investigates an intrinsically safe liquid–solid phase approach for the catalytic hydrogenation of 2,4-dinitrotoluene (DNT) to TDA using isopropanol as the hydrogen source. To screen out an efficient bimetallic catalyst formulation, we systematically regulated the loadings of Ru and Pt, and a highly efficient bimetallic Ru-Pt/AC catalyst exhibiting both dehydrogenation and hydrogenation functionalities was successfully prepared. Under atmospheric pressure and a reaction temperature of 135&#xa0;°C, with the mass ratio of catalyst, isopropanol, and water to DNT being 0.6, 47, and 35, respectively, and a reaction time of 3h, the yield of TDA reached 99.2%. The isopropanol dehydrogenation rate of the catalyst is the key to the entire reaction process; water can activate the nitro group through hydrogen bonds and thereby promote the hydrogenation reaction. The Ru species on the surface of the Ru-Pt/AC bimetallic catalyst are present in the metallic state, whereas Pt exists in both the Pt⁰ and Pt²⁺ oxidation states. The metal particle size is approximately 2&#xa0;nm. This reaction offers a safe and efficient green alternative for the production of materials used in the polyurethane industry.</p>