Synthesis, characterization and catalytic behavior of the ir/nb(2)0(5)/si0(2) system in the citronellal hydrogenation

• HUGO ROJAS ^[1] ; GLORIA BORDA ^[1] ; PATRICIO REYES ^[2] ; JULIO CESAR CASTAÑEDA ^[1] ; J.L.G FIERRO ^[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] Instituto de Catálisis y Petroleoquímica

     Instituto de Catálisis y Petroleoquímica

     Madrid, España

     

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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. 53, Nº. 2, 2008, págs. 1464-1468
• Idioma: inglés
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  • The citronellal hydrogenation was studied on Ir/Nb(2)0(5)-Si0(2) catalysts. Aseries of catalysts was synthesized with different niobia contents (Ir/Nl 1.10%; Ir/N2 2.54%; Ir/N3 3.25%; Ir/N4 5.30%wt%) using the wet impregnation method. These catalysts were reduced in hydrogen atmosphere at low or high temperatures. 473K (LTR) or 773K respectively. Their structural and surface properties were investigated by XRD, TEM, XPS, DTP, FTIR, H2 chemisorption at 298 K and surface specific area by using the BET method. The X ray diffraction studies revealed only the peaks due to niobia, mainly in those with higher niobia loading. No diffraction lines due to Ir were observed due to its lower content and/or to its high dispersion. The catalytic tests in the hydrogenation of citronellal were carried out in a batch reactor operated at 6.2 bar of H2 and 343 K. All catalysts showed higher selectivity to isopulegol and to their products due to the cyclization of the citronellal molecule.