Application of Na 2 CO 3 ‐Regulated Nickel‐Based Catalysts in the Aqueous‐Phase Hydrogenation of Dinitrotoluene to Toluenediamine

Abstract This study developed a supported nickel‐based catalyst for the aqueous‐phase hydrogenation of dinitrotoluene (DNT) to toluenediamine (TDA). Using Ni(NO 3 ) 2 ·6H 2 O as the nickel source, Na 2 CO 3 as the precipitating agent, and activated carbon as the support, catalysts were prepared by impregnation‐precipitation. The effect of Na 2 CO 3 /Ni molar ratio on catalyst structure and performance was investigated. Results show that when the ratio is 1.8, the catalyst achieves complete DNT conversion and 100% TDA selectivity in 6 min at 120 °C and 2.1 MPa, effectively controlling tar formation. After 8 recycles, the catalyst remains highly stable, showing good industrial application prospects.