MORPHOLOGICAL AND STRUCTURAL FEATURES OF CO/TIO2 CATALYSTS PREPARED BY DIFFERENT METHODS AND THEIR PERFORMANCE IN THE LIQUID PHASE HYDROGENATION OF alpha, beta UNSATURATED ALDEHYDES

The effect of the preparation method of Co/TiO2 catalysts on the performance in the liquid phase hydrogenation of cinnamaldehyde and crotonaldehyde has been studied. The Co/TiO2 catalysts were prepared by impregnation on titania (TiO2, P-25), sol-gel, and precipitation procedures. Different reductio...

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Autores principales:	AGUIRRE,M. C., SANTORI,G, FERRETTI,O, FIERRO,J. L. G., REYES,P
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2006
Materias:	Co/TiO2 catalysts characterisation hydrogenation cinnamaldehyde crotonaldehyde
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072006000100008
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spelling	oai:scielo:S0717-970720060001000082006-06-08MORPHOLOGICAL AND STRUCTURAL FEATURES OF CO/TIO2 CATALYSTS PREPARED BY DIFFERENT METHODS AND THEIR PERFORMANCE IN THE LIQUID PHASE HYDROGENATION OF alpha, beta UNSATURATED ALDEHYDESAGUIRRE,M. C.SANTORI,GFERRETTI,OFIERRO,J. L. G.REYES,P Co/TiO2 catalysts characterisation hydrogenation cinnamaldehyde crotonaldehyde The effect of the preparation method of Co/TiO2 catalysts on the performance in the liquid phase hydrogenation of cinnamaldehyde and crotonaldehyde has been studied. The Co/TiO2 catalysts were prepared by impregnation on titania (TiO2, P-25), sol-gel, and precipitation procedures. Different reduction-oxidation-reduction cycles were carried out in order to detect possible changes in the nature of the phases and their reduction degrees. The catalysts were characterized by specific area measurements, TEM, ED, XPS and TPR/TPO studies. The catalysts prepared by the sol-gel and precipitation method exhibit higher resistance to sintering when they are treated under the same reduction-oxidation-reduction cycles, than the impregnated catalyst. Morphological changes observed by TEM were used to explain the catalytic behavior showed by the catalysts. The presence of Coº, CoO and Co3O4 phases in the reduced samples were detected by different methods. XPS results show the existence of small particles of CoO, which are interacting with the support, which are very difficult to reduce. TEM and electron diffraction structural studies show an effect of metal-support interaction by the appearance of channels and pill-box form in the particles. The highest yield in both catalytic hydrogenation reactions were obtained with the Co/TiO2 catalysts prepared by precipitation and sol gel methods. The selectivity was closed to 50 and 30 % for cinnamyl alcohol and crotyl alcohol, respectivelyinfo:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.51 n.1 20062006-03-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072006000100008en10.4067/S0717-97072006000100008
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Co/TiO2 catalysts characterisation hydrogenation cinnamaldehyde crotonaldehyde
spellingShingle	Co/TiO2 catalysts characterisation hydrogenation cinnamaldehyde crotonaldehyde AGUIRRE,M. C. SANTORI,G FERRETTI,O FIERRO,J. L. G. REYES,P MORPHOLOGICAL AND STRUCTURAL FEATURES OF CO/TIO2 CATALYSTS PREPARED BY DIFFERENT METHODS AND THEIR PERFORMANCE IN THE LIQUID PHASE HYDROGENATION OF alpha, beta UNSATURATED ALDEHYDES
description	The effect of the preparation method of Co/TiO2 catalysts on the performance in the liquid phase hydrogenation of cinnamaldehyde and crotonaldehyde has been studied. The Co/TiO2 catalysts were prepared by impregnation on titania (TiO2, P-25), sol-gel, and precipitation procedures. Different reduction-oxidation-reduction cycles were carried out in order to detect possible changes in the nature of the phases and their reduction degrees. The catalysts were characterized by specific area measurements, TEM, ED, XPS and TPR/TPO studies. The catalysts prepared by the sol-gel and precipitation method exhibit higher resistance to sintering when they are treated under the same reduction-oxidation-reduction cycles, than the impregnated catalyst. Morphological changes observed by TEM were used to explain the catalytic behavior showed by the catalysts. The presence of Coº, CoO and Co3O4 phases in the reduced samples were detected by different methods. XPS results show the existence of small particles of CoO, which are interacting with the support, which are very difficult to reduce. TEM and electron diffraction structural studies show an effect of metal-support interaction by the appearance of channels and pill-box form in the particles. The highest yield in both catalytic hydrogenation reactions were obtained with the Co/TiO2 catalysts prepared by precipitation and sol gel methods. The selectivity was closed to 50 and 30 % for cinnamyl alcohol and crotyl alcohol, respectively
author	AGUIRRE,M. C. SANTORI,G FERRETTI,O FIERRO,J. L. G. REYES,P
author_facet	AGUIRRE,M. C. SANTORI,G FERRETTI,O FIERRO,J. L. G. REYES,P
author_sort	AGUIRRE,M. C.
title	MORPHOLOGICAL AND STRUCTURAL FEATURES OF CO/TIO2 CATALYSTS PREPARED BY DIFFERENT METHODS AND THEIR PERFORMANCE IN THE LIQUID PHASE HYDROGENATION OF alpha, beta UNSATURATED ALDEHYDES
title_short	MORPHOLOGICAL AND STRUCTURAL FEATURES OF CO/TIO2 CATALYSTS PREPARED BY DIFFERENT METHODS AND THEIR PERFORMANCE IN THE LIQUID PHASE HYDROGENATION OF alpha, beta UNSATURATED ALDEHYDES
title_full	MORPHOLOGICAL AND STRUCTURAL FEATURES OF CO/TIO2 CATALYSTS PREPARED BY DIFFERENT METHODS AND THEIR PERFORMANCE IN THE LIQUID PHASE HYDROGENATION OF alpha, beta UNSATURATED ALDEHYDES
title_fullStr	MORPHOLOGICAL AND STRUCTURAL FEATURES OF CO/TIO2 CATALYSTS PREPARED BY DIFFERENT METHODS AND THEIR PERFORMANCE IN THE LIQUID PHASE HYDROGENATION OF alpha, beta UNSATURATED ALDEHYDES
title_full_unstemmed	MORPHOLOGICAL AND STRUCTURAL FEATURES OF CO/TIO2 CATALYSTS PREPARED BY DIFFERENT METHODS AND THEIR PERFORMANCE IN THE LIQUID PHASE HYDROGENATION OF alpha, beta UNSATURATED ALDEHYDES
title_sort	morphological and structural features of co/tio2 catalysts prepared by different methods and their performance in the liquid phase hydrogenation of alpha, beta unsaturated aldehydes
publisher	Sociedad Chilena de Química
publishDate	2006
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072006000100008
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_version_	1718445357900234752

MORPHOLOGICAL AND STRUCTURAL FEATURES OF CO/TIO2 CATALYSTS PREPARED BY DIFFERENT METHODS AND THEIR PERFORMANCE IN THE LIQUID PHASE HYDROGENATION OF alpha, beta UNSATURATED ALDEHYDES

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