SBA-15 Supported Silver Catalyst for the Efficient Aerobic Oxidation of Toluene Under Solvent-Free Conditions

The efficient SBA-15 supported silver catalysts(Ag/SBA-15) were prepared and characterized by ICP-OES, XRD, TEM, SEM, XPS and N 2 adsorption–desorption techniques. The catalysts exhibited an excellent catalytic activity for the aerobic oxidation of toluene to benzaldehyde under solvent-free conditio...

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Bibliographic Details
Published in:Catalysis letters 2022-10, Vol.152 (10), p.2881-2891
Main Authors: Chen, Lei, Chen, Yanjiao, Dai, Xuan, Guo, Jiaming, Peng, Xinhua
Format: Article
Language:English
Subjects:
Activation energy
Adsorption
Benzaldehyde
Catalysis
Catalysts
Catalytic activity
Catalytic oxidation
Chemistry
Chemistry and Materials Science
Conversion
Free radicals
Industrial Chemistry/Chemical Engineering
Organometallic Chemistry
Oxidation
Oxidation-reduction reaction
Physical Chemistry
Selectivity
Silver
Solvents
Substrates
Toluene
X ray photoelectron spectroscopy
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Summary:The efficient SBA-15 supported silver catalysts(Ag/SBA-15) were prepared and characterized by ICP-OES, XRD, TEM, SEM, XPS and N 2 adsorption–desorption techniques. The catalysts exhibited an excellent catalytic activity for the aerobic oxidation of toluene to benzaldehyde under solvent-free conditions. Conversion of toluene and selectivity of benzaldehyde were 50% and 89% respectively over catalyst with 9.1 wt% Ag loading (10Ag/SBA-15). A wide range of substrates were tolerated under the selected reaction conditions. The kinetic study shows that the oxidation of toluene over 10Ag/SBA-15 is pseudo-first-order reaction and the activation energy E a is 45.1 kJ/mol. A plausible mechanism involving oxygen free radicals was proposed for the aerobic oxidation reaction. Compared with the traditional method, the newly designed heterogeneous catalytic system shows better economic applicability, environmental friendliness and broader application prospects. Graphical abstract
ISSN:1011-372X
1572-879X
DOI:10.1007/s10562-021-03845-9