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

Narrowly sized colloidal Au particles of varying average sizes (3–30 nm) were immobilized on an inert support (SiO 2 ) 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 time...

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Bibliographic Details
Published in:Catalysis letters 2008-08, Vol.124 (3-4), p.238-242
Main Authors: Sun, Ke-Qiang, Luo, Si-Wei, Xu, Na, Xu, Bo-Qing
Format: Article
Language:English
Subjects:
Acetaldehyde
Acetic acid
Aqueous solutions
Catalysis
Chemistry
Chemistry and Materials Science
Colloidal state and disperse state
Conversion
Dependence
Ethanol
Exact sciences and technology
General and physical chemistry
Gold
Industrial Chemistry/Chemical Engineering
Organometallic Chemistry
Oxidation
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Physical Chemistry
Silicon dioxide
Size effects
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:Narrowly sized colloidal Au particles of varying average sizes (3–30 nm) were immobilized on an inert support (SiO 2 ) 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.
ISSN:1011-372X
1572-879X
DOI:10.1007/s10562-008-9507-4