ENANTIOSELECTIVE HYDROGENATION OF 1-PHENYL-1,2-PROPANODIONE ON Pt/ ZrO2 CATALYSTS

The enantioselective hydrogenation of 1-phenyl-1,2-propanedione at 298K and pressure of 40 bar of H2 over zirconia supported Pt catalysts has been studied. Three different zirconia were prepared : i) ZrO2- P obtained by a precipitation procedure from ZrOCl2 ii) MSZrO2 obtained by a sol-gel procedure...

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Autores principales:	URBINA,CLAUDIA, PECCHI,GINA, CAMPOS,CRISTIAN, REYES,PATRICIO
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2010
Materias:	Platinum mesostructured supports enantioselective hydrogenation
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072010000100007
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spelling	oai:scielo:S0717-970720100001000072010-04-29ENANTIOSELECTIVE HYDROGENATION OF 1-PHENYL-1,2-PROPANODIONE ON Pt/ ZrO2 CATALYSTSURBINA,CLAUDIAPECCHI,GINACAMPOS,CRISTIANREYES,PATRICIO Platinum mesostructured supports enantioselective hydrogenation The enantioselective hydrogenation of 1-phenyl-1,2-propanedione at 298K and pressure of 40 bar of H2 over zirconia supported Pt catalysts has been studied. Three different zirconia were prepared : i) ZrO2- P obtained by a precipitation procedure from ZrOCl2 ii) MSZrO2 obtained by a sol-gel procedure using cetryltrimethylammonium bromide (CTMABR) as surfactant to get a mesostructured solid iii) CNTsZrO2 obtained after impregnation of carbon nanotubes with ZrO(NO)3 followed by pyrolisis and calcination. Pt (1 wt%) was introduced on the support by impregnation of an aqueous solution of H2PtCl6. The catalysts were characterized by nitrogen adsorption-desorption isotherms at 77 K, hydrogen chemisorption, XRD and TEM techniques. The reactions were carried out in a stainless steel batch reactor using cyclohexane as solvent and cinchonidine as chiral modifier. The presence of CD in the reaction medium is necessary to induce an enantiomeric excess (ee) of the desired product R-1phenyl-1 hydroxi-2-propanone. In all the studied systems, the relation between the enantioselectivity and the CD concentration added in situ exhibits a bell type curve; indicative of the importance of competitive adsorption between the modifier and the substrate on the catalyst surface. On the other hand, confinement effect led to an important enhancement in the activity in those catalysts supported on mesostructured supports, mainly in the Pt/CNTsZrO2 catalyst.info:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.55 n.1 20102010-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072010000100007en10.4067/S0717-97072010000100007
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Platinum mesostructured supports enantioselective hydrogenation
spellingShingle	Platinum mesostructured supports enantioselective hydrogenation URBINA,CLAUDIA PECCHI,GINA CAMPOS,CRISTIAN REYES,PATRICIO ENANTIOSELECTIVE HYDROGENATION OF 1-PHENYL-1,2-PROPANODIONE ON Pt/ ZrO2 CATALYSTS
description	The enantioselective hydrogenation of 1-phenyl-1,2-propanedione at 298K and pressure of 40 bar of H2 over zirconia supported Pt catalysts has been studied. Three different zirconia were prepared : i) ZrO2- P obtained by a precipitation procedure from ZrOCl2 ii) MSZrO2 obtained by a sol-gel procedure using cetryltrimethylammonium bromide (CTMABR) as surfactant to get a mesostructured solid iii) CNTsZrO2 obtained after impregnation of carbon nanotubes with ZrO(NO)3 followed by pyrolisis and calcination. Pt (1 wt%) was introduced on the support by impregnation of an aqueous solution of H2PtCl6. The catalysts were characterized by nitrogen adsorption-desorption isotherms at 77 K, hydrogen chemisorption, XRD and TEM techniques. The reactions were carried out in a stainless steel batch reactor using cyclohexane as solvent and cinchonidine as chiral modifier. The presence of CD in the reaction medium is necessary to induce an enantiomeric excess (ee) of the desired product R-1phenyl-1 hydroxi-2-propanone. In all the studied systems, the relation between the enantioselectivity and the CD concentration added in situ exhibits a bell type curve; indicative of the importance of competitive adsorption between the modifier and the substrate on the catalyst surface. On the other hand, confinement effect led to an important enhancement in the activity in those catalysts supported on mesostructured supports, mainly in the Pt/CNTsZrO2 catalyst.
author	URBINA,CLAUDIA PECCHI,GINA CAMPOS,CRISTIAN REYES,PATRICIO
author_facet	URBINA,CLAUDIA PECCHI,GINA CAMPOS,CRISTIAN REYES,PATRICIO
author_sort	URBINA,CLAUDIA
title	ENANTIOSELECTIVE HYDROGENATION OF 1-PHENYL-1,2-PROPANODIONE ON Pt/ ZrO2 CATALYSTS
title_short	ENANTIOSELECTIVE HYDROGENATION OF 1-PHENYL-1,2-PROPANODIONE ON Pt/ ZrO2 CATALYSTS
title_full	ENANTIOSELECTIVE HYDROGENATION OF 1-PHENYL-1,2-PROPANODIONE ON Pt/ ZrO2 CATALYSTS
title_fullStr	ENANTIOSELECTIVE HYDROGENATION OF 1-PHENYL-1,2-PROPANODIONE ON Pt/ ZrO2 CATALYSTS
title_full_unstemmed	ENANTIOSELECTIVE HYDROGENATION OF 1-PHENYL-1,2-PROPANODIONE ON Pt/ ZrO2 CATALYSTS
title_sort	enantioselective hydrogenation of 1-phenyl-1,2-propanodione on pt/ zro2 catalysts
publisher	Sociedad Chilena de Química
publishDate	2010
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072010000100007
work_keys_str_mv	AT urbinaclaudia enantioselectivehydrogenationof1phenyl12propanodioneonptzro2catalysts AT pecchigina enantioselectivehydrogenationof1phenyl12propanodioneonptzro2catalysts AT camposcristian enantioselectivehydrogenationof1phenyl12propanodioneonptzro2catalysts AT reyespatricio enantioselectivehydrogenationof1phenyl12propanodioneonptzro2catalysts
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ENANTIOSELECTIVE HYDROGENATION OF 1-PHENYL-1,2-PROPANODIONE ON Pt/ ZrO2 CATALYSTS

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