Resumen

ROJAS, HUGO et al. LIQUID-PHASE HYDROGENATION OF m-DINITROBENZENE OVER PLATINUM CATALYSTS. J. Chil. Chem. Soc. [online]. 2011, vol.56, n.3, pp. 793-798. ISSN 0717-9707.  doi: 10.4067/S0717-97072011000300016.

The m-dinitrobenzene hydrogenation to m-phenylenediamine in liquid phase was studied with platinum supported on SiO₂, TiO₂, Al₂O₃ and Nb₂O₅ catalysts. Incipient impregnation method was used to prepare the catalysts with 1wt% of Pt. The effect of the support and the reduction temperature (473 K or 773 K) were analyzed. The materials were characterized by X-ray diffraction (XRD), nitrogen physisorption (77 K), hydrogen chemisorption (298 K), transmission electron microscopy (TEM), temperature programmed reduction (H₂-TPR) and temperature programmed desorption of ammonia (NH₃-TPD). The results showed that Pt/ TiO₂ (HT) catalyst had a higher yield (60%) toward m- phenylenediamine and conversion level (98.2%) of m-dinitrobenzene. This behavior can be attributed to the reduction of PtO crystallites to metallic Pt, small particle size and the strong metal-support interaction due to the migration of TiO species on the Pt crystallites.

Palabras clave : m-dinitrobenzene; m-phenylenediamine; hydrogenation; fine chemical.