Journal
NANOSCALE
Volume 12, Issue 24, Pages 12817-12823Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0nr02796k
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Funding
- National Key R&D Program of China [2016YFB0601303]
- National Natural Science Foundation of China (NSFC) [21776018, 21521005, U170760003, 21905014]
- China Postdoctoral Science Foundation [2018M640048]
- Fundamental Research Funds for the Central Universities [XK1802-6]
- Qinghai Provincial Major Science and Technology Special Project [2020-GX-A1]
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Manganese oxides are well explored effective ozone decomposition catalysts, but the accumulation of oxygen trapped on their surfaces and high valence state restrict their catalyst efficiency. Herein, we report manganese based layered double hydroxide (LDH) catalysts with different average oxidation states (AOS) of Mn. MgMnAl-LDH catalysts show large specific surface area, abundant oxygen vacancies, stable structure and excellent catalytic ozone decomposition performance. The valence state of Mn can be tuned by adjusting the metallic element ratio in the LDH matrix, and a catalyst with AOS of only 2.3 is acquired. The impacts of the valence states of Mn on the catalytic ozone decomposition process were further studied by density functional theory (DFT) calculations. It is found that the Mn(2+)facilitates the desorption of generated oxygen on the surface of LDHs, while Mn(3+)and Mn(4+)contribute to the dissociation of adsorbed ozone.
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