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Metal-Exchanged β Zeolites as Catalysts for the Conversion of Acetone to Hydrocarbons
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; in revised form: 22 December 2011 / Accepted: 24 December 2011 / Published: 5 January 2012
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
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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.
Cruz-Cabeza AJ, Esquivel D, Jiménez-Sanchidrián C, Romero-Salguero FJ. Metal-Exchanged β Zeolites as Catalysts for the Conversion of Acetone to Hydrocarbons. Materials. 2012; 5(1):121-134.
Cruz-Cabeza, Aurora J.; Esquivel, Dolores; Jiménez-Sanchidrián, César; Romero-Salguero, Francisco J. 2012. "Metal-Exchanged β Zeolites as Catalysts for the Conversion of Acetone to Hydrocarbons." Materials 5, no. 1: 121-134.