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Materials 2012, 5(1), 121-134; doi:10.3390/ma5010121
Article

Metal-Exchanged β Zeolites as Catalysts for the Conversion of Acetone to Hydrocarbons

,
,
 and *
Departamento de Química Orgánica, Instituto Universitario de Investigación en Química Fina y Nanoquímica (IUIQFN), Universidad de Córdoba, Campus de Rabanales, Edificio Marie Curie, Ctra. Nnal. IV, km 396, Córdoba 14014, Spain Present address: Van’t Hoff Institute for Molecular Sciences, Universiteit van Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
* Author to whom correspondence should be addressed.
Received: 30 November 2011 / Revised: 22 December 2011 / Accepted: 24 December 2011 / Published: 5 January 2012
(This article belongs to the Special Issue Advances in Porous Inorganic Materials)
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Abstract

Various metal-β zeolites have been synthesized under similar ion-exchange conditions. During the exchange process, the nature and acid strength of the used cations modified the composition and textural properties as well as the Brönsted and Lewis acidity of the final materials. Zeolites exchanged with divalent cations showed a clear decrease of their surface Brönsted acidity and an increase of their Lewis acidity. All materials were active as catalysts for the transformation of acetone into hydrocarbons. Although the protonic zeolite was the most active in the acetone conversion (96.8% conversion), the metal-exchanged zeolites showed varied selectivities towards different products of the reaction. In particular, we found the Cu-β to have a considerable selectivity towards the production of isobutene from acetone (over 31% yield compared to 7.5% of the protonic zeolite). We propose different reactions mechanisms in order to explain the final product distributions.
Keywords: zeolite β; ion exchange; characterization; acidity; pyridine; acetonitrile; acetone conversion; hydrocarbons; isobutene; mesitylene zeolite β; ion exchange; characterization; acidity; pyridine; acetonitrile; acetone conversion; hydrocarbons; isobutene; mesitylene
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Cruz-Cabeza, A.J.; Esquivel, D.; Jiménez-Sanchidrián, C.; Romero-Salguero, F.J. Metal-Exchanged β Zeolites as Catalysts for the Conversion of Acetone to Hydrocarbons. Materials 2012, 5, 121-134.

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