Highly Efficient and Robust Au/MgCuCr2O4 Catalyst for Gas-Phase Oxidation of Ethanol to Acetaldehyde.

Department of Chemical Engineering and Chemistry, Eindhoven University of Technology , 5600 MB Eindhoven, The Netherlands.
Journal of the American Chemical Society (Impact Factor: 10.68). 09/2013; DOI: 10.1021/ja406820f
Source: PubMed

ABSTRACT Gold nanoparticles (AuNPs) supported on MgCuCr2O4-spinel are highly active and selective for the aerobic oxidation of ethanol to acetaldehyde (conversion 100%; yield ∼95%). The catalyst is stable for at least 500 h. The unprecedented catalytic performance is due to strong synergy between metallic AuNPs and surface Cu(+) species. X-ray photoelectron spectroscopy shows that Cu(+) is already formed during catalyst preparation and becomes more dominant at the surface during ethanol oxidation. These Cu(+) species are stabilized at the surface of the ternary MgCuCr2O4-spinel support. Further kinetic measurements indicate that the Cu(+) species act as sites for O2 activation.