Promoted catalytic transformation of polycyclic aromatic hydrocarbons by MnO2 polymorphs: Synergistic effects of Mn3+ and oxygen vacancies

Identifying the Fe3Mn3O8 phase as a superior catalyst for low-temperature catalytic oxidation of formaldehyde in air

“…Among these samples, in the antibonding of Mn 3+ could be trapped by O 2 . 26 Interestingly, our work displayed that the best Fe-Mn (1 : 1) catalyst exhibited the highest concentrations of Mn 3+ and Mn 4+ . As shown in TPR analysis (Fig.…”

“…Then, the HCHO molecules would be transformed into DOM (step II), 25 together with the adsorbed oxygen molecules on the surface of the Fe 3 Mn 3 O 8 catalyst dissociated by oxygen vacancies transformed into superoxide radicals. 26 The DOM molecules can reconstruct into adsorbed HCOOH molecules by the active species (step III). 25 After that, the newly formed active oxygen would further attack the adsorbed HCOOH molecules to generate ˙CO 3 (step IV), 25 and finally the adsorbed ˙CO 3 molecules would be completely decomposed into CO 2 and H 2 O by the active species (step V).…”

“…25 Besides, the degradation efficiency of polycyclic aromatic hydrocarbons could be enhanced via synergistic effects of Mn 3+ and oxygen vacancies. 26 An efficient ozone decomposition was realized by introducing Ce to the lattice of MnO 2 with additional surface oxygen vacancies and surface defects. 27 Binary metal oxides have been widely used for catalytic reactions due to their adjustable metal composition and oxygen defect concentration.…”

Reactive oxygen species on transition metal-based catalysts for sustainable environmental applications

“…166 Analogously, the MnO 2 -mediated degradation of anthracene is mediated by both the non-radical oxidation by Mn 3+ and the radical-based oxidation by O 2 c À . 258 It is worth remarking that the geometry of O 2 c À on the catalyst surface may affect the outcome of the oxidation reaction. Li et al engineered decient BiOCl that can oxidize NO completely into nitrate under visible light irradiation with >99% selectivity (Fig.…”

“…166 Analogously, the MnO 2 -mediated degradation of anthracene is mediated by both the non-radical oxidation by Mn 3+ and the radical-based oxidation by O 2 ˙ − . 258…”