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Title: On the synergistic catalytic properties of bimetallic mesoporous materials containing aluminum and zirconium: The prins cyclisation of citronellal
Authors: Telalović, S.
Ramanathan, A.
Ng, J.F.
Maheswari, R.
Kwakernaak, C.
Soulimani, F.
Brouwer, H.C.
Chuah, G.K. 
Weckhuysen, B.M.
Hanefeld, U.
Keywords: Brønsted acids
heterogeneous catalysis
Lewis acids
mesoporous materials
Issue Date: 11-Feb-2011
Citation: Telalović, S., Ramanathan, A., Ng, J.F., Maheswari, R., Kwakernaak, C., Soulimani, F., Brouwer, H.C., Chuah, G.K., Weckhuysen, B.M., Hanefeld, U. (2011-02-11). On the synergistic catalytic properties of bimetallic mesoporous materials containing aluminum and zirconium: The prins cyclisation of citronellal. Chemistry - A European Journal 17 (7) : 2077-2088. ScholarBank@NUS Repository.
Abstract: Bimetallic three-dimensional amorphous mesoporous materials, Al-Zr-TUD-1 materials, were synthesised by using a surfactant-free, one-pot procedure employing triethanolamine (TEA) as a complexing reagent. The amount of aluminium and zirconium was varied in order to study the effect of these metals on the Brønsted and Lewis acidity, as well as on the resulting catalytic activity of the material. The materials were characterised by various techniques, including elemental analysis, X-ray diffraction, high-resolution TEM, N2 physisorption, temperature-programmed desorption (TPD) of NH3, and 27Al MAS NMR, XPS and FT-IR spectroscopy using pyridine and CO as probe molecules. Al-Zr-TUD-1 materials are mesoporous with surface areas ranging from 700-900am2 g-1, an average pore size of around 4anm and a pore volume of around 0.70acm3 g -1. The synthesised Al-Zr-TUD-1 materials were tested as catalyst materials in the Lewis acid catalysed Meerwein-Ponndorf-Verley reduction of 4-tert-butylcyclohexanone, the intermolecular Prins synthesis of nopol and in the intramolecular Prins cyclisation of citronellal. Although Al-Zr-TUD-1 catalysts possess a lower amount of acid sites than their monometallic counterparts, according to TPD of NH3, these materials outperformed those of the monometallic Al-TUD-1 as well as Zr-TUD-1 in the Prins cyclisation of citronellal. This proves the existence of synergistic properties of Al-Zr-TUD-1. Due to the intramolecular nature of the Prins cyclisation of citronellal, the hydrophilic surface of the catalyst as well as the presence of both Brønsted and Lewis acid sites synergy could be obtained with bimetallic Al-Zr-TUD-1. Besides spectroscopic investigation of the active sites of the catalyst material a thorough testing of the catalyst in different types of reactions is crucial in identifying its specific active sites. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Source Title: Chemistry - A European Journal
ISSN: 09476539
DOI: 10.1002/chem.201002909
Appears in Collections:Staff Publications

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