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Aerobic Oxidation of Alcohols on Au Nanocatalyst: Insight to the Roles of the Ni-Al Layered Double Hydroxides Support.
- Source :
- ChemCatChem; Jun2014, Vol. 6 Issue 6, p1737-1747, 11p
- Publication Year :
- 2014
-
Abstract
- Au nanoparticles (NPs) supported on Ni-Al layered double hydroxides (LDHs) were shown to be efficient heterogeneous catalysts for the highly selective oxidation of alcohols to the corresponding aldehydes or ketones under base-free or even solvent-free conditions with O<subscript>2</subscript> as the sole oxidant. The Au NPs can be uniformly distributed on Ni-Al LDHs support, which is beneficial to the catalytic activity. In addition, the weak Brønsted basic property of the support enables the aerobic oxidation of alcohols under base-free conditions. More importantly, unlike Al<subscript>2</subscript>O<subscript>3</subscript>, which is inert, Ni-Al-LDHs are redox-actively involved in prompting the electron transfer to O<subscript>2</subscript> via the Au nanocatalyst because of the presence of Ni<superscript>II</superscript>. Both of the basic and the redox properties of Ni-Al-LDHs can be tuned by adjusting the ratio of Ni:Al to achieve the best synergistic effects between Au NPs and the supports. The activity of the obtained Au catalysts was found to be structurally associated with the arrangements of NiO<subscript>6</subscript> and AlO<subscript>6</subscript> octahedra in the surface hydroxide layers which were different from the bulk Ni:Al ratio. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 18673880
- Volume :
- 6
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- ChemCatChem
- Publication Type :
- Academic Journal
- Accession number :
- 96362779
- Full Text :
- https://doi.org/10.1002/cctc.201400046