Opposite effects of Co and Cu dopants on the catalytic activities of birnessite MnO2 catalyst for low-temperature formaldehyde oxidation

Yusuf, Abubakar and Sun, Yong and Ren, Yong and Snape, Colin and Wang, Chengjun and Jia, Hongpeng and He, Jun (2020) Opposite effects of Co and Cu dopants on the catalytic activities of birnessite MnO2 catalyst for low-temperature formaldehyde oxidation. The Journal of Physical Chemistry C, 124 (48). pp. 26320-26331. ISSN 1932-7447

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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 formation of surface active oxygen species, reduced activation energy, and enhanced catalytic activity for low-temperature oxidation of HCHO. On the contrary, Cu doping led to a drastic suppression of the catalytic activity of δ-MnO2, despite its enhanced redox properties and slight increase in the surface concentration of active oxygen species, compared to pristine δ-MnO2. Diffuse reflectance infrared Fourier transform analysis revealed that in the presence of Cu, carbonate intermediate species accumulate on the surface of the catalysts, leading to partial blockage of active sites and suppression of catalytic activity.

Item Type: Article
Keywords: doped birnessite MnO2; doping; Copper; Cobalt; formaldehyde; catalytic oxidation
Schools/Departments: University of Nottingham Ningbo China > Faculty of Science and Engineering > Department of Chemical and Environmental Engineering
University of Nottingham Ningbo China > Faculty of Science and Engineering > Department of Mechanical, Materials and Manufacturing Engineering
Identification Number: https://doi.org/10.1021/acs.jpcc.0c08508
Depositing User: Wu, Cocoa
Date Deposited: 18 Dec 2020 08:18
Last Modified: 18 Dec 2020 08:18
URI: http://eprints.nottingham.ac.uk/id/eprint/64086

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