Catalysis Letters

, Volume 124, Issue 3–4, pp 238–242 | Cite as

Gold Nano-size Effect in Au/SiO2 for Selective Ethanol Oxidation in Aqueous Solution

Article

Abstract

Narrowly sized colloidal Au particles of varying average sizes (3–30 nm) were immobilized on an inert support (SiO2) to study the Au size effect on the aerobic oxidation of ethanol in aqueous solution. Au particles with an average diameter of 5 nm showed an areal activity that was about three times that of the smaller (3 nm), and 15 times that of larger (10–30 nm) Au particles. Investigation on the dependence of product yields on ethanol conversion over these differently sized Au particles clearly uncovered that the yield of acetic acid increased always with the ethanol conversion, while that of acetaldehyde passed a maximum at an ethanol conversion of 20–30%, therefore well demonstrating that acetaldehyde is the intermediate product in the oxidation of ethanol to acetic acid.

Keywords

Gold catalyst Nano-size effect Ethanol Aerobic oxidation Acetic acid 

Notes

Acknowledgements

We thank NSF (Grant No. 20573062) and National Basic Research Project of China (Grant No. 2003CB615804) for financial support of this work.

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  1. 1.Innovative Catalysis Program, Key Lab of Organic Optoelectronics & Molecular Engineering, Department of ChemistryTsinghua UniversityBeijingChina

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