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首页> 外文期刊>Environmental Science & Technology: ES&T >Boosting the Dispersity of Metallic Ag Nanoparticles and Ozone Decomposition Performance of Ag-Mn Catalysts via Manganese Vacancy-Dependent Metal-Support Interactions
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Boosting the Dispersity of Metallic Ag Nanoparticles and Ozone Decomposition Performance of Ag-Mn Catalysts via Manganese Vacancy-Dependent Metal-Support Interactions

机译：Boosting the Dispersity of Metallic Ag Nanoparticles and Ozone Decomposition Performance of Ag-Mn Catalysts via Manganese Vacancy-Dependent Metal-Support Interactions

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摘要

Ozone (O-3) removal has important implications for environmental protection and human health, and Ag-Mn catalysts have shown promising O-3 decomposition. Catalysts with Ag supported on porous cube-like alpha-Mn2O3 (Ag/Mn-C) with high utilization of Ag were prepared by the impregnation method and showed excellent O-3 decomposition activity. Physicochemical characterizations demonstrated that metallic Ag nanoparticles (Ag-n(0)) were mainly anchored on manganese vacancies, forming Ag-O-Mn bonds between Ag-n(0) and alpha-Mn2O3-C. The abundant manganese vacancies of alpha-Mn2O3-C can lead to Ag-n(0) with a smaller particle size and more uniform dispersion, thereby resulting in markedly enhanced O-3 decomposition performance compared to Ag-n(0) with a large particle size and uneven distribution on rod-like alpha-Mn2O3 (Ag/Mn-R). Under a relative humidity of 65% and a space velocity of 1,110,000 h(-1), the conversion of 40 ppm O-3 over the 2%Ag/Mn-C catalyst within 6 h (98%) at 30 degrees C was more than twice as high as that of the 2%Ag/Mn-R catalyst (42%). The study provides guidance for the design of highly efficient Ag-based catalysts and the understanding of the microstructure of supported catalysts.

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