Achieving high yields in the production of bulk chemicals is an important goal for the chemical industry. We investigated the influence of the metal on the catalytic performance of M/MgCuCr2O4 (M = Cu, Ag, Pd, Pt, Au) catalysts to better understand the metal-support synergy for the aerobic oxidation of ethanol. Pt/MgCuCr2O4 and Pd/MgCuCr2O4 are more active and less selective for ethanol oxidation than the other catalysts, mainly because they can dehydrogenate and then cleave the carbon-carbon bonds in ethanol at relatively low temperature. Because of the facile oxidation of Cu0 and Ag0 under aerobic oxidation conditions, Cu/MgCuCr2O4 and Ag/MgCuCr2O4 are less active for ethanol oxidation. On contrary, Au/MgCuCr2O4 is a very active, selective and stable catalyst for sustainable production of acetaldehyde, achieving 96% selectivity at full ethanol conversion (space-time-yield up to 583 galdehyde gAu-1 h-1) at 250 °C. Low gold loading and high gold dispersion are important to enhance the Au0-Cu+ synergy and the catalytic efficiency of Au/MgCuCr2O4.
|Number of pages||9|
|Journal||Journal of Catalysis|
|Publication status||Published - 1 Nov 2015|
- Selective oxidation
- Spinel support