Abstract
Trimetallic Au-Pd-Pt nanoparticles have been supported on activated carbon by the sol-immobilisation method. They are found to be highly active and selective catalysts for the solvent-free aerobic oxidation of benzyl alcohol. The addition of Pt promotes the selectivity to the desired product benzaldehyde at the expense of toluene formation. Detailed aberration corrected STEM-XEDS analysis confirmed that the supported particles are indeed Au-Pd-Pt ternary alloys, but also identified composition fluctuations from particle-to-particle which vary systematically with nanoparticle size.
Highlights
The oxidation of primary alcohols to aldehydes is an industrially important process, as aldehydes are valuable as intermediates and as high value components for the perfume industry
We have previously demonstrated that Au–Pd bimetallic nanoparticles can be very active for the alcohol oxidation reaction, and provide high selectivity toward aldehydes even under solvent-free reaction conditions.[4,5,6,7,8]
In order to achieve high selectivity towards the aldehyde, either a low reaction temperature approach was chosen resulting in a low turnover frequency (TOF), or the conversion was kept at a low level
Summary
The oxidation of primary alcohols to aldehydes is an industrially important process, as aldehydes are valuable as intermediates and as high value components for the perfume industry. This reaction is carried out using expensive and toxic oxidants such as chromate or permanganate, causing serious environmental and economical concerns.[1,2,3] catalytic oxidation of primary alcohols to aldehydes using molecular oxygen/air, or other greener oxidants such as hydrogen peroxide, becomes an attractive alternative. Using benzyl alcohol oxidation as an example, we demonstrate that when a small amount of Pt metal is alloyed into the Au–Pd sols, a high selectivity toward benzaldehyde can be achieved in the solvent-free oxidation of benzyl alcohol reaction while still preserving high conversion levels
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