Liquid-phase hydrogenation of m-dinitrobenzene over platinum catalysts

• HUGO ROJAS ^[1] ; GLORIA BORDA ^[1] ; PATRICIO REYES ^[2] ; MARÍA BRIJALDO ^[1] ; JESÚS VALENCIA ^[3]
  1. [1] Universidad Pedagógica y Tecnológica de Colombia

     Universidad Pedagógica y Tecnológica de Colombia

     Colombia

     
  2. [2] Universidad de Concepción

     Universidad de Concepción

     Comuna de Concepción, Chile

     
  3. [3] Universidad Nacional de Colombia

     Universidad Nacional de Colombia

     Colombia

     

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• Localización: Journal of the Chilean Chemical Society (Boletín de la Sociedad Chilena de Química), ISSN-e 0717-6309, ISSN 0366-1644, Vol. 56, Nº. 3, 2011, págs. 793-798
• Idioma: inglés
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• Resumen

  • 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.