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High-dispersed catalysts of core?shell structured Au@SiO2 for formaldehyde catalytic oxidation
In this article, we first report a correlation between the Au based catalyst with core?shell structure and HCHO catalytic oxidation behavior by adjusting of number of Au cores and the SiO2 shell thickness. The Au@SiO2 catalysts displayed the best HCHO reaction activities when Au cores size is about 5 nm and the SiO2 shell thickness is about 50 nm. Based on the results of characterizations and HCHO catalytic oxidation performance, it is suggested that both single-core and multi-core structures are beneficial to HCHO combustion and the multi-core particles can significantly improve the catalytic performance comparing with single-core particles. It is deduced that Au cores transport electrons to the surface of SiO2 shell which improves the formation of high oxidation states Au (Au+ and Au3+) due to the strong metal-support interaction in core?shell structure. Meanwhile, Au3+ formed in single-core structure and Au+ formed in multi-core structure are both active sites in the catalytic oxidation of HCHO. Besides, it is supposed that Au+ is more effective compared to Au3+. Insight into the activity dependence on the strong Au-SiO2 interaction is not only meaningful for development of advanced uniform well dispersed Au based catalysts, but also supports the development of Au@SiO2 catalysts for practical applications of VOCs elimination.
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Reference£º
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI