Release Time:2019-03-12  Hits:

Indexed by: Journal Article

Date of Publication: 2017-04-21

Journal: CHEMCATCHEM

Included Journals: EI、SCIE

Volume: 9

Issue: 8

Page Number: 1363-1367

ISSN: 1867-3880

Key Words: copper; gold; heterogeneous catalysis; oxidation; supported catalysts

Abstract: The oxidation of ethanol to acetaldehyde in the fine-chemical industry is a burgeoning process that requires leading-edge technology. A major challenge is to find a catalyst with high ethanol conversion and high acetaldehyde selectivity at a high gas hourly space velocity (GHSV) and a low operation temperature. Boron nitride nanosphere supported Au-Cu nanoparticles offer much opportunity for low-temperature ethanol oxidation. A catalytic ethanol conversion of 77% and a selectivity of 94% towards acetaldehyde were achieved at a temperature of 180 degrees C and a high GHSV of 100 000 mL g(cat)(-1) h(-1), values that far exceed those obtained with Au-Cu/SiO2. The immobilized Au-Cu nanoparticles have an average size of approximately 3 nm, and the majority of Au species are assigned Au delta-. The weak interaction of acetaldehyde with both Au-Cu active phases and the boron nitride support facilitates the adsorption-desorption behavior of acetaldehyde. As a result, the progression of secondary reactions is slowed and the degree of coverage of the active sites is minimized.