CATALYTIC HYDROGENATION OF THYMOL OVER Pd/MgO PREPARED BY SMAD METHOD

In this work are summarized the results obtained in the thymol hydrogenation using Pd/MgO catalyst. The catalyst was prepared from a colloidal dispersion of Pd in 2-propanol using the SMAD ( Solvent Metal Atom Dispersion) methodology. The catalyst was characterized by means of Transmission Electron...

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Autores principales:	CÁRDENAS T,GALO, OLIVA C,RICARDO, REYES N,PATRICIO
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2006
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072006000400013
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spelling	oai:scielo:S0717-970720060004000132007-03-08CATALYTIC HYDROGENATION OF THYMOL OVER Pd/MgO PREPARED BY SMAD METHODCÁRDENAS T,GALOOLIVA C,RICARDOREYES N,PATRICIOIn this work are summarized the results obtained in the thymol hydrogenation using Pd/MgO catalyst. The catalyst was prepared from a colloidal dispersion of Pd in 2-propanol using the SMAD ( Solvent Metal Atom Dispersion) methodology. The catalyst was characterized by means of Transmission Electron Microscopy (TEM) and by chemisorption of hydrogen (metallic area and dispersion). The particles show a bimodal distribution in the histogram of particle distribution with a range of particle size between 11 and 16.6 nm. The catalyst metallic area was 26m²/g with a 5.8 % dispersion. The products obtained from thymol hydrogenation were menthone and isomenthone. The catalyst was not able to hydrogenate the carbonyl group and did not produce the menthol and /or isomers. The different temperatures (80, 100, 125 and 150ºC) only produce an effect in the catalyst activity, but not in the selectivity. The same results were obtained with increase in pressure (3, 5, 7 and 10 bars) and the charge catalyst (3, 7, 10 and 20%) was used. The studies were carried out with different thymol amounts over the same catalyst, and demonstrated no change in the activity. This reveals that the catalyst is poisoned most probably by unreacted thymol. The addition of a promotor (Fe+3) to activate the carbonyl group, allows the obtention of a mixture of menthol isomers. The Pd/MgO catalyst is more active than Pd/C and Pd/Al2O3. This demonstrates that the support plays an important role, however, the Pd is not able to hydrogenate the carbonyl group in menthone or isomenthoneinfo:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.51 n.4 20062006-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072006000400013en10.4067/S0717-97072006000400013
institution	Scielo Chile
collection	Scielo Chile
language	English
description	In this work are summarized the results obtained in the thymol hydrogenation using Pd/MgO catalyst. The catalyst was prepared from a colloidal dispersion of Pd in 2-propanol using the SMAD ( Solvent Metal Atom Dispersion) methodology. The catalyst was characterized by means of Transmission Electron Microscopy (TEM) and by chemisorption of hydrogen (metallic area and dispersion). The particles show a bimodal distribution in the histogram of particle distribution with a range of particle size between 11 and 16.6 nm. The catalyst metallic area was 26m²/g with a 5.8 % dispersion. The products obtained from thymol hydrogenation were menthone and isomenthone. The catalyst was not able to hydrogenate the carbonyl group and did not produce the menthol and /or isomers. The different temperatures (80, 100, 125 and 150ºC) only produce an effect in the catalyst activity, but not in the selectivity. The same results were obtained with increase in pressure (3, 5, 7 and 10 bars) and the charge catalyst (3, 7, 10 and 20%) was used. The studies were carried out with different thymol amounts over the same catalyst, and demonstrated no change in the activity. This reveals that the catalyst is poisoned most probably by unreacted thymol. The addition of a promotor (Fe+3) to activate the carbonyl group, allows the obtention of a mixture of menthol isomers. The Pd/MgO catalyst is more active than Pd/C and Pd/Al2O3. This demonstrates that the support plays an important role, however, the Pd is not able to hydrogenate the carbonyl group in menthone or isomenthone
author	CÁRDENAS T,GALO OLIVA C,RICARDO REYES N,PATRICIO
spellingShingle	CÁRDENAS T,GALO OLIVA C,RICARDO REYES N,PATRICIO CATALYTIC HYDROGENATION OF THYMOL OVER Pd/MgO PREPARED BY SMAD METHOD
author_facet	CÁRDENAS T,GALO OLIVA C,RICARDO REYES N,PATRICIO
author_sort	CÁRDENAS T,GALO
title	CATALYTIC HYDROGENATION OF THYMOL OVER Pd/MgO PREPARED BY SMAD METHOD
title_short	CATALYTIC HYDROGENATION OF THYMOL OVER Pd/MgO PREPARED BY SMAD METHOD
title_full	CATALYTIC HYDROGENATION OF THYMOL OVER Pd/MgO PREPARED BY SMAD METHOD
title_fullStr	CATALYTIC HYDROGENATION OF THYMOL OVER Pd/MgO PREPARED BY SMAD METHOD
title_full_unstemmed	CATALYTIC HYDROGENATION OF THYMOL OVER Pd/MgO PREPARED BY SMAD METHOD
title_sort	catalytic hydrogenation of thymol over pd/mgo prepared by smad method
publisher	Sociedad Chilena de Química
publishDate	2006
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072006000400013
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CATALYTIC HYDROGENATION OF THYMOL OVER Pd/MgO PREPARED BY SMAD METHOD

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