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Selective liquid-phase hydrogenation of citral over supported bimetallic Pt–Co catalysts

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Abstract.
The liquid-phase hydrogenation of citral was studied at 393 K and 10 bar on Pt–Co/C catalysts, having
different Pt/(Pt + Co) ratios and containing a total metal load of about 2%. The monometallic and
bimetallic Pt–Co/C catalysts were prepared by impregnation and co-impregnation, respectively, with
cobalt tris(acetylacetonate) and platinum bis(acetylacetonate). Monometallic Pt/C and Co/C catalysts
showed very low activity and selectivity to the desired products. Undesirable reactions, such as citral
decarbonylation and hydrogenolysis, were observed with these monometallic catalysts. Instead,
bimetallic Pt–Co/C proved very active and selective to geraniol/nerol and the main products detected
were geraniol/nerol, citronellal and citronellol. Hydrogenation kinetic constants were determined by
modeling catalytic data and using a pseudo-homogeneous kinetics. From the analysis of the kinetic
parameters, an optimum Pt/(Pt + Co) ratio was found for both the catalytic activity and selectivity
towards geraniol/nerol. Furthermore, it was determined that this optimum ratio depends on the
activation conditions. Temperature-programmed reduction (TPR) experiments and X-ray absorption
spectroscopy (XAS) demonstrated the existence of Pt–Co bimetallic compounds on the carbon support.
On the basis of these results, it was proposed that cobalt improves the catalytic performance of platinum
by electron transfer. This electron transfer is favored by the high interaction of both metals existing in
these types of bimetallic compounds.

Keywords: Citral hydrogenation, Aldehydes (alfa,b-unsaturated), Platinum-based catalysts, Cobalt-based catalysts, Bimetallic compounds

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Informasi Detail

Judul Seri

Applied Catalysis A: General

No. Panggil

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Penerbit

London : Elsevier B.V.., 2009

Deskripsi Fisik

Applied Catalysis A: General 358 (2009) 32–41

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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