Hydrogenation of dinitrobenzenes over titania-supported palladium nanoparticles

Catalysts of 1% Pd/TiO₂ type were prepared via the deposition–precipitation of Pd polyhydroxo complexes followed by reduction with hydrogen at 23 °C. These catalysts were found to be active for the selective hydrogenation of m-dinitrobenzene into m-phenylenediamine at 25–50 °C and 0.5 MPa H₂ in a batch reactor.