2020
DOI: 10.1021/acs.jpcc.0c08508
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Opposite Effects of Co and Cu Dopants on the Catalytic Activities of Birnessite MnO2 Catalyst for Low-Temperature Formaldehyde Oxidation

Abstract: Defect engineering is an effective strategy to enhance the activity of catalysts for various applications. Herein, it was demonstrated that in addition to enhancing surface properties via doping, the influence of dopants on the surface–intermediate interaction is a critical parameter that impacts the catalytic activity of doped catalysts for low-temperature formaldehyde (HCHO) oxidation. The incorporation of Co into the lattice structure of δ-MnO2 led to the generation of oxygen vacancies, which promoted the f… Show more

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Cited by 27 publications
(17 citation statements)
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“…It can be seen that the Co/Mn and Fe/Mn ratio of the Co–Fe-δ-MnO 2 catalyst exhibited an upward trend as the amount of Co–Fe PBA added increased from 0 to 20 wt %, while the K/Mn ratio remains roughly constant with that of the δ-MnO 2 catalyst. These results indirectly evidence that the Co and Fe ions were incorporated into the δ-MnO 2 framework rather than substituting K ions in the interlayer structure of birnessite …”
Section: Resultsmentioning
confidence: 99%
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“…It can be seen that the Co/Mn and Fe/Mn ratio of the Co–Fe-δ-MnO 2 catalyst exhibited an upward trend as the amount of Co–Fe PBA added increased from 0 to 20 wt %, while the K/Mn ratio remains roughly constant with that of the δ-MnO 2 catalyst. These results indirectly evidence that the Co and Fe ions were incorporated into the δ-MnO 2 framework rather than substituting K ions in the interlayer structure of birnessite …”
Section: Resultsmentioning
confidence: 99%
“…As depicted in Figure b, the asymmetric O 1s spectra of the obtained catalysts can be segmented into two peaks at 529.9 and 531.4 eV ascribed to the lattice oxygen (O latt ) and surface adsorption oxygen species (O ads ), respectively . It is commonly recognized that the content of O ads reflects the amount of oxygen vacancy on the catalysts since O 2 can be adsorbed at oxygen vacancies and transformed into O ads on the catalyst’s surface. , Thus, the molar ratio of O ads to O latt increased from 0.255 for δ-MnO 2 to 0.657 for Co–Fe-δ-MnO 2 -25% as the amount of Co–Fe PBA added increased (Table ), suggesting that the amount of surface oxygen vacancies were gradually increased. , These results are consistent with the Mn 2p 3/2 and EPR analysis above. Furthermore, the binding energy of O 1s over Co–Fe-δ-MnO 2 shifts to a lower value compared to that of δ-MnO 2 , indicating weaker interaction between the Mn and O atoms. , As a result, the mobility of lattice oxygen could be improved so that the cycling of the emergence-annihilation of reactive oxygen species could be easily realized during the reaction process, thereby enhancing the catalysis performance …”
Section: Resultsmentioning
confidence: 99%
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