THE SOLVENT EFFECT IN THE HYDROGENATION OF CITRAL OVER Ir AND Ir-Fe/TiO2 CATALYSTS

The solvent effect in the citral hydrogenation over iridium catalysts has been studied. The catalysts used in this research were, the monometallic Ir/ TiO2 reduced at low or high temperature (LT y HT) and the bimetallic Ir-Fe/TiO2 (LT y HT) catalysts. As solvent n-heptane, an equimolar mixture n-hep...

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Autores principales:	ROJAS,H., FIERRO,J.L.G., REYES,P.
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2007
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072007000200008
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spelling	oai:scielo:S0717-970720070002000082007-09-13THE SOLVENT EFFECT IN THE HYDROGENATION OF CITRAL OVER Ir AND Ir-Fe/TiO2 CATALYSTSROJAS,H.FIERRO,J.L.G.REYES,P.The solvent effect in the citral hydrogenation over iridium catalysts has been studied. The catalysts used in this research were, the monometallic Ir/ TiO2 reduced at low or high temperature (LT y HT) and the bimetallic Ir-Fe/TiO2 (LT y HT) catalysts. As solvent n-heptane, an equimolar mixture n-heptane-1-propanol and 1-propanol were used. The reactions were carried out at a hydrogen pressure of 8.27 bar and at 363 K. In the LT catalyst, the catalytic activity increases upon the addition of Fe3+. This positive effect was obtained keeping constant the selectivity to the unsaturated alcohol, being 100% selective to the products obtained by hydrogenation of the C=O bond. In the HT catalysts, both the addition of Fe and the presence of TiOx moieties generated by the strong metal support interaction (SMSI) effect, lead to an increase of surface acidity. In LT and HT catalysts, an increase in the polarity of the solvent increases the catalytic activity, however the reaction pathway is modified by the presence of acid sites which in polar solvents allow the formation of acetals, mainly in the HT catalystsinfo:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.52 n.2 20072007-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072007000200008en10.4067/S0717-97072007000200008
institution	Scielo Chile
collection	Scielo Chile
language	English
description	The solvent effect in the citral hydrogenation over iridium catalysts has been studied. The catalysts used in this research were, the monometallic Ir/ TiO2 reduced at low or high temperature (LT y HT) and the bimetallic Ir-Fe/TiO2 (LT y HT) catalysts. As solvent n-heptane, an equimolar mixture n-heptane-1-propanol and 1-propanol were used. The reactions were carried out at a hydrogen pressure of 8.27 bar and at 363 K. In the LT catalyst, the catalytic activity increases upon the addition of Fe3+. This positive effect was obtained keeping constant the selectivity to the unsaturated alcohol, being 100% selective to the products obtained by hydrogenation of the C=O bond. In the HT catalysts, both the addition of Fe and the presence of TiOx moieties generated by the strong metal support interaction (SMSI) effect, lead to an increase of surface acidity. In LT and HT catalysts, an increase in the polarity of the solvent increases the catalytic activity, however the reaction pathway is modified by the presence of acid sites which in polar solvents allow the formation of acetals, mainly in the HT catalysts
author	ROJAS,H. FIERRO,J.L.G. REYES,P.
spellingShingle	ROJAS,H. FIERRO,J.L.G. REYES,P. THE SOLVENT EFFECT IN THE HYDROGENATION OF CITRAL OVER Ir AND Ir-Fe/TiO2 CATALYSTS
author_facet	ROJAS,H. FIERRO,J.L.G. REYES,P.
author_sort	ROJAS,H.
title	THE SOLVENT EFFECT IN THE HYDROGENATION OF CITRAL OVER Ir AND Ir-Fe/TiO2 CATALYSTS
title_short	THE SOLVENT EFFECT IN THE HYDROGENATION OF CITRAL OVER Ir AND Ir-Fe/TiO2 CATALYSTS
title_full	THE SOLVENT EFFECT IN THE HYDROGENATION OF CITRAL OVER Ir AND Ir-Fe/TiO2 CATALYSTS
title_fullStr	THE SOLVENT EFFECT IN THE HYDROGENATION OF CITRAL OVER Ir AND Ir-Fe/TiO2 CATALYSTS
title_full_unstemmed	THE SOLVENT EFFECT IN THE HYDROGENATION OF CITRAL OVER Ir AND Ir-Fe/TiO2 CATALYSTS
title_sort	solvent effect in the hydrogenation of citral over ir and ir-fe/tio2 catalysts
publisher	Sociedad Chilena de Química
publishDate	2007
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072007000200008
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THE SOLVENT EFFECT IN THE HYDROGENATION OF CITRAL OVER Ir AND Ir-Fe/TiO2 CATALYSTS

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