Journal
GREEN CHEMISTRY
Volume 16, Issue 9, Pages 4137-4143Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4gc00774c
Keywords
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Funding
- Operational Program Research and Development for Innovations - European Regional Development Fund [CZ.1.05/2.1.00/03.0058]
- Operational Program Education for competitiveness - European Social Fund of the Ministry of Education, Youth and Sports of the Czech Republic [CZ.1.07/2.3.00/30.0041]
- Technology Agency of the Czech Republic Competence Centres [TE01010218]
- Portuguese Research Grant [Pest-OE/FIS/UI0068/2011]
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An efficient and sustainable protocol is described for the oxidative esterification of aldehydes and the reduction of aromatic nitro compounds that uses a magnetically separable and reusable maghemite-supported gold nanocatalyst (nanocat-Fe-Au) under mild conditions. The complex chemical, morphological, structural and size analyses, including e.g. XPS, HRTEM, Mossbauer spectroscopy and HRTEM, revealed that the hybrid material is composed of a well-defined stoichiometric maghemite support (20-30 nm) decorated with ultrasmall (5-6 nm) gold nanoparticles. The hybrid catalytic system containing 4 wt% of nanogold has been generated using simple impregnation methods in aqueous medium from readily available starting materials and was recycled five times without any significant loss in catalytic activity; high yields, 40-95% and 83-94% for oxidative esterification and reduction reactions, respectively, were obtained.
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