1. Co-containing polyoxometalate-based heterogeneous catalysts for the selective aerobic oxidation of aldehydes under ambient conditions
- Author
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Kholdeeva, O.A., Vanina, M.P., Timofeeva, M.N., Maksimovskaya, R.I., Trubitsina, T.A., Melgunov, M.S., Burgina, E.B., Mrowiec-Bialon, J., Jarzebski, A.B., and Hill, C.L.
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ORGANIC compounds , *CHEMICAL inhibitors , *OXIDES , *SILICON compounds - Abstract
Tetra-
n -butylammonium (TBA) salts of the cobalt-monosubstituted Keggin polyoxometalate (Co-POM), TBA4HPW11CoO39 (I) and TBA5PW11CoO39 (II), have been prepared and characterized by using elemental analysis, potentiometric titration, IR, UV–vis, 31P NMR, and cyclic voltammetry. Different modes of heterogenization of the Co-POM, including anchoring to both NH2- and NH3+-modified mesoporous silica surfaces and sol–gel synthesis, have been performed. The resulting solid catalysts were characterized by N2-adsorption measurements, elemental analysis, DR-UV–vis, and FT-IR spectroscopy. The activity of the solid Co-POM materials to catalyze aerobic oxidation of two representative aldehydes, isobutyraldehyde (IBA) in MeCN and formaldehyde in H2O under mild conditions (20–40 °C, 1 atm of air), was assessed and compared with the catalytic activity of the corresponding homogeneous Co-POMs. An emphasis has been placed on leaching tests and catalyst recycling. The effect of protonation of the amine-modified silica surface or the Co-POM on the loading, stability, and activity of the Co-POM solid catalyst was evaluated. [Copyright &y& Elsevier]- Published
- 2004
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