Abstract
Three hydrocalumites in a Ca/Al ratio of 2 were prepared by coprecipitation, the sol–gel method and homogeneous precipitation with urea. The solids thus obtained possess the typical structure of layered double hydroxides (LDHs), which, however, is lost by calcination at 450 °C. X-ray diffraction analysis and measurements of CO2 thermal programmed desorption revealed that the calcination products were amorphous and that the particular form containing the largest number of basic sites was that obtained by coprecipitation. The calcined solids were tested as catalysts in the Meerwein–Ponndorf–Verley reaction of benzaldehyde and cyclohexanone with 2-propanol, and that containing the greatest number of basic sites was found to be the most active in the process. A mechanism for the process consistent with the results is proposed.
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The authors gratefully acknowledge funding from Spain’s Ministry of Education and Science (Project MAT-2006-04847), FEDER funds, and the Innovation, Science and Enterprise Council of the Andalusian Regional Government.
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Mora, M., López, M.I., Jiménez-Sanchidrián, C. et al. Ca/Al Mixed Oxides as Catalysts for the Meerwein–Ponndorf–Verley Reaction. Catal Lett 136, 192–198 (2010). https://doi.org/10.1007/s10562-010-0329-9
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DOI: https://doi.org/10.1007/s10562-010-0329-9