Selective hydrogenation of carvone and o-xylene on Pd-Cu catalysts prepared by surface redox reaction

R. Mélendrez, G. Del Angel, V. Bertin, M. A. Valenzuela, J. Barbier

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Abstract

A series of Pd and Pd-Cu bimetallic catalysts were prepared by surface redox reaction and coimpregnation methods. A comparison between the preparation methods in the activity and selectivity for o-xylene and carvone hydrogenation was done. FTIR studies showed that the Cu is deposited mainly in the low coordination Pd sites when the catalyst was prepared by redox, whereas a random distribution of Cu on the Pd surface was obtained for the catalyst prepared by coimpregnation. The activity and selectivity of bimetallic catalysts, were found to depending on the method of preparation used. For o-xylene hydrogenation in redox catalyst, the selectivity to trans- 1,2-dimethylcyclohexane was lower than that obtained in the Pd/SiO2 reference catalyst, whereas in the coimpregnated catalyst, the trans isomer selectivity was higher. In the redox preparation, the selective hydrogenation of carvone favors the formation of carvotanacetone, whereas the coimpregnated catalyst favors the selectivity to carvomenthone. (C) 2000 Elsevier Science B.V.
Original languageAmerican English
Pages (from-to)143-149
Number of pages128
JournalJournal of Molecular Catalysis A: Chemical
DOIs
StatePublished - 20 Jun 2000

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Redox reactions
xylene
Xylene
Hydrogenation
hydrogenation
catalyst
catalysts
Catalysts
Catalyst selectivity
selectivity
preparation
2-xylene
carvone
statistical distributions
Isomers
Catalyst activity
isomers

Cite this

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title = "Selective hydrogenation of carvone and o-xylene on Pd-Cu catalysts prepared by surface redox reaction",
abstract = "A series of Pd and Pd-Cu bimetallic catalysts were prepared by surface redox reaction and coimpregnation methods. A comparison between the preparation methods in the activity and selectivity for o-xylene and carvone hydrogenation was done. FTIR studies showed that the Cu is deposited mainly in the low coordination Pd sites when the catalyst was prepared by redox, whereas a random distribution of Cu on the Pd surface was obtained for the catalyst prepared by coimpregnation. The activity and selectivity of bimetallic catalysts, were found to depending on the method of preparation used. For o-xylene hydrogenation in redox catalyst, the selectivity to trans- 1,2-dimethylcyclohexane was lower than that obtained in the Pd/SiO2 reference catalyst, whereas in the coimpregnated catalyst, the trans isomer selectivity was higher. In the redox preparation, the selective hydrogenation of carvone favors the formation of carvotanacetone, whereas the coimpregnated catalyst favors the selectivity to carvomenthone. (C) 2000 Elsevier Science B.V.",
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doi = "10.1016/S1381-1169(99)00426-4",
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journal = "Journal of Molecular Catalysis A: Chemical",
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Selective hydrogenation of carvone and o-xylene on Pd-Cu catalysts prepared by surface redox reaction. / Mélendrez, R.; Del Angel, G.; Bertin, V.; Valenzuela, M. A.; Barbier, J.

In: Journal of Molecular Catalysis A: Chemical, 20.06.2000, p. 143-149.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Selective hydrogenation of carvone and o-xylene on Pd-Cu catalysts prepared by surface redox reaction

AU - Mélendrez, R.

AU - Del Angel, G.

AU - Bertin, V.

AU - Valenzuela, M. A.

AU - Barbier, J.

PY - 2000/6/20

Y1 - 2000/6/20

N2 - A series of Pd and Pd-Cu bimetallic catalysts were prepared by surface redox reaction and coimpregnation methods. A comparison between the preparation methods in the activity and selectivity for o-xylene and carvone hydrogenation was done. FTIR studies showed that the Cu is deposited mainly in the low coordination Pd sites when the catalyst was prepared by redox, whereas a random distribution of Cu on the Pd surface was obtained for the catalyst prepared by coimpregnation. The activity and selectivity of bimetallic catalysts, were found to depending on the method of preparation used. For o-xylene hydrogenation in redox catalyst, the selectivity to trans- 1,2-dimethylcyclohexane was lower than that obtained in the Pd/SiO2 reference catalyst, whereas in the coimpregnated catalyst, the trans isomer selectivity was higher. In the redox preparation, the selective hydrogenation of carvone favors the formation of carvotanacetone, whereas the coimpregnated catalyst favors the selectivity to carvomenthone. (C) 2000 Elsevier Science B.V.

AB - A series of Pd and Pd-Cu bimetallic catalysts were prepared by surface redox reaction and coimpregnation methods. A comparison between the preparation methods in the activity and selectivity for o-xylene and carvone hydrogenation was done. FTIR studies showed that the Cu is deposited mainly in the low coordination Pd sites when the catalyst was prepared by redox, whereas a random distribution of Cu on the Pd surface was obtained for the catalyst prepared by coimpregnation. The activity and selectivity of bimetallic catalysts, were found to depending on the method of preparation used. For o-xylene hydrogenation in redox catalyst, the selectivity to trans- 1,2-dimethylcyclohexane was lower than that obtained in the Pd/SiO2 reference catalyst, whereas in the coimpregnated catalyst, the trans isomer selectivity was higher. In the redox preparation, the selective hydrogenation of carvone favors the formation of carvotanacetone, whereas the coimpregnated catalyst favors the selectivity to carvomenthone. (C) 2000 Elsevier Science B.V.

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