Abstract
A series of catalysts consisting of gold nanoparticles supported on MnO2 presenting different morphologies were synthesized and tested in the base-free oxidation of furfural. Ultra-small Au particles (less than 3 nm) were deposited on low (commercial MnO2) and high (NF, nanoflowers and NW, nanowires MnO2) surface area supports. High activity was observed for Au/MnO2-NF material with very high selectivity to furoic acid. The X-ray photoelectron spectroscopy (XPS) study confirmed the presence of a significant amount of highly active Auδ+ species on the surface of the Au/MnO2-NF catalyst. These species seem to be responsible for the high activity in oxidation of furfural under mild conditions (air as oxidant, 110 °C).
Highlights
In recent decades, supported gold nanoparticles have been extensively studied because of their unusual catalytic properties [1,2,3,4]
It is already well established that the catalytic activity of the supported gold catalysts strongly depends average measurements were applied to determine depends onon thethe average
As can be seen from the results presented above, the activity of the Au-based catalysts supported on MnO2 strongly depends on the structure and morphology of the MnO2 oxide used for the on MnO2 strongly depends on the structure and morphology of the MnO2 oxide used for the synthesis
Summary
In recent decades, supported gold nanoparticles have been extensively studied because of their unusual catalytic properties [1,2,3,4]. It is well recognized that the size of gold nanoparticles determines both the activity and the selectivity of the final catalyst [4,5]. When working with supported gold nanoparticles (NPs), the support plays a very important role. Supported gold nanoparticles should be well dispersed to be able to interact with the support. Appropriate support can increase the dispersion of gold NPs, and improve the overall catalytic activity [8].
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