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Catalysts 2013, 3(4), 853-877; doi:10.3390/catal3040853

Catalysts Supported on Carbon Materials for the Selective Hydrogenation of Citral

Carbon Materials Research Group, Department of Inorganic Chemistry, Faculty of Sciences, University of Granada, Campus Fuentenueva s/n, 18071 Granada, Spain
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Received: 14 August 2013 / Revised: 22 September 2013 / Accepted: 11 October 2013 / Published: 22 October 2013
(This article belongs to the Special Issue Carbon Catalysts)
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Abstract

The heterogeneously catalyzed selective-hydrogenation of citral is one of the more feasible ways for obtaining its appreciated unsaturated-alcohols, nerol and geraniol, which are present in over 250 essential oils. Thus, citral has very recently come to be produced petro-chemically in very large quantities, and so partial hydrogenation of citral has become a very economical route for the production of these compounds. However, the selective hydrogenation of citral is not easy, because citral is an α,β-unsaturated aldehyde which possesses three double bonds that can be hydrogenated: an isolated C=C bond and the conjugated C=O and C=C bonds. For this reason, in catalyst selection there are several important issues which affect the product selectivity, for example, the active metal and metal particle size which are factors related to the catalyst preparation method, catalyst precursor, or support surface area, as well as other factors such as porosity, the addition of a second catalytic metal, and, of course, the type of catalyst support. About this last one, carbon materials are very interesting supports for this type of hydrogenation reaction due to their unique chemical and textural properties. This review collects and analyzes the results obtained in the selective hydrogenation of citral catalyzed by carbon material supported metals. View Full-Text
Keywords: citral; hydrogenation; activated carbon; graphite; carbon nanotubes citral; hydrogenation; activated carbon; graphite; carbon nanotubes
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MDPI and ACS Style

Bailón-García, E.; Maldonado-Hódar, F.J.; Pérez-Cadenas, A.F.; Carrasco-Marín, F. Catalysts Supported on Carbon Materials for the Selective Hydrogenation of Citral. Catalysts 2013, 3, 853-877.

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