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vol.53 issue2INTERFACE BETWEEN TWO IMMISCIBLE LIQUID ELECTROLYTES: A REVIEWCALCIUM CARBONATE GROWTH MODIFICATION BY CONSTITUENTS RELEASES FROM POROUS CELLULOSE FILTER MEMBRANES author indexsubject indexarticles search
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Journal of the Chilean Chemical Society

On-line version ISSN 0717-9707

Abstract

ROJAS, HUGO et al. SYNTHESIS, CHARACTERIZATION AND CATALYTIC BEHAVIOR OF THE Ir/Nb205/Si02 SYSTEM IN THE CITRONELLAL HYDROGENATION. J. Chil. Chem. Soc. [online]. 2008, vol.53, n.2, pp.1464-1468. ISSN 0717-9707.  http://dx.doi.org/10.4067/S0717-97072008000200003.

The citronellal hydrogenation was studied on Ir/Nb205-Si02 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.

Keywords : Ir/Nb205/Si02 Catalysts; citronellal hydrogenation; cyclization; isopulegol.

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