m-Dinitrobenzene hydrogenation using supported platinum catalysts over silica, titania and alumina
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The Pt/SiO2, Pt/Al2O3 y Pt/TiO2 catalysts through wet impregnation at 1% concentration in weigh metal were prepared. The resulting catalysts were characterized by X-ray diffraction (XRD), nitrogen physisorption (77 K) and hydrogen chemisorptions (298 K). Theses catalytic systems were employed in the reaction of m-dinitrobenzene hydrogenation toward m-phenylenediamine. The m-phenylenediamine is aromatic amine used in fine chemicals.
The reactions were carried out in batch reactor to hydrogen pressure of 0.82 MPa, 343 K, using ethanol as solvent. The products resulting were analyzed by gas chromatography. The results showed that Pt/TiO2 catalyst had a high level of selectivity toward m-phenylenediamine (72.4 %) and level of conversion of m-dinitrobenzene (91.5 %). This behavior could be attributed to the strong metal-support interaction, as well as this catalyst is promising by production of m-phenylenediamine.
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