Porous manganese oxides synthesized with natural products at room temperature: a superior humidity-tolerant catalyst for ozone decomposition

Ozone is a prevalent pollutant threatening human health worldwide; hence, the search for efficient humidity-tolerant catalysts for ozone removal is of great importance. In this study, porous cerium-doped manganese oxides (Ce-MnO x ) with superior humidity-tolerant activity for ozone decomposition we...

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Bibliographic Details
Published in:Catalysis science & technology 2020-04, Vol.1 (7), p.2254-2267
Main Authors: Li, Lianxin, Zhang, Pengyi, Cao, Ranran
Format: Article
Language:English
Subjects:
Catalysts
Cerium
Crystallization
Decomposition
Decomposition reactions
Dopamine
Heat treatment
Humidity
Manganese oxides
Nanocrystals
Natural products
Ozone
Pollutants
Room temperature
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Summary:Ozone is a prevalent pollutant threatening human health worldwide; hence, the search for efficient humidity-tolerant catalysts for ozone removal is of great importance. In this study, porous cerium-doped manganese oxides (Ce-MnO x ) with superior humidity-tolerant activity for ozone decomposition were synthesized via a 1 hour reaction between permanganate, dopamine and Ce 3+ at room temperature without any thermal treatment. Herein, dopamine, which is widely distributed in nature, acts as an easy reductant and also inhibits the growth and crystallization of manganese oxides (MnO x ) via in situ coordination. The addition of Ce 3+ further inhibits the growth of MnO x and gives rise to more acidic solutions, which facilitates the dispersion of the MnO x nucleus coordinated with the protonated dopamine derivatives. Consequently, porous Ce-MnO x with abundant macropores and mesopores was obtained, which consists mostly of amorphous MnO x ; prevalent atomic doping and embedded nanocrystals were revealed by HAADF-STEM. The as-synthesized hierarchical porous Ce-MnO x exhibited excellent activity and humidity tolerance for O 3 decomposition, achieving 100% decomposition of 100 ppm O 3 within the 10 h test under a high space velocity of 540 L g cat −1 h −1 at 50% RH and 25 °C. Porous cerium-doped manganese oxides have been facilely synthesized with dopamine and exhibit prominent activity and humidity tolerance for O 3 decomposition.
ISSN:2044-4753
2044-4761
DOI:10.1039/d0cy00196a