Catalytic oxidation of NO over MnO₂ with different crystal structures

Abstract

α-, β-, γ- and δ-MnO2 catalysts were prepared by a hydrothermal method and their catalytic properties for NO oxidation were evaluated.

Core–Shell Structure and Interaction Mechanism of γ‐MnO2 Coated Sulfur for Improved Lithium‐Sulfur Batteries

“…The presence of SO x species and Mn 3 O 4 were also verified by attenuated total reflection−Fourier transform infrared spectroscopy (ATR−FTIR, Figure S5, Supporting Information). The FTIR spectrum of pristine γ‐MnO 2 sample exhibits two characteristic bands at 520 and 470 cm −1 which are corresponding to the stretching vibration of MnO bond in [MnO 6 ] octahedra . The FTIR spectrum of recovered solid (MnO 2 ‐Li 2 S 4 0.5 h) not only displays an SS band of polysulfide at 485 cm −1 but also shows two weak peaks at 630 and 670 cm −1 due to polythionate and thiosulfate species .…”

“…The FTIR spectrum of pristine γ-MnO 2 sample exhibits two characteristic bands at 520 and 470 cm −1 which are corresponding to the stretching vibration of MnO bond in [MnO 6 ] octahedra. [90] The FTIR spectrum of recovered solid (MnO 2 -Li 2 S 4 0.5 h) not only displays an SS band of polysulfide at 485 cm −1 but also shows two weak peaks at 630 and 670 cm −1 due to polythionate and thiosulfate species. [48,91,92] Meanwhile, the FTIR spectrum of recovered solid (MnO 2 -L 2 S 4 5 d) exhibits a considerable shift with respect to γ-MnO 2 sample, indicating a strong interaction between γ-MnO 2 and LiPS ( Figure S5 Figure S6a, Supporting Information), the relative intensities of Mn 3+ and Mn 2+ obviously increase to 35% and 22% in the Mn 2p 3/2 XPS spectrum, compared to 29% (Mn 3+ ) and 11% (Mn 2+ ) of S@γ-MnO 2 cathode before discharge (DoD 0%, Figure S6b,c, Supporting Information).…”

Efficient removal of Pb(ii) ions using manganese oxides: the role of crystal structure

“…21 The inuence of crystal forms on MnO 2 catalytic performance has been extensively studied. 22,23 Different crystallographic MnO 2 materials were also prepared for pollutants adsorption, and MnO 2 adsorbents showed varying adsorption performance depending on the surface area and crystalline structure. Zhang et al investigated the effect of the crystallographic structure of MnO 2 on Li + adsorption, and found that MnO 2 ion sieve with l-crystallographic structure exhibited higher capacity for Li(I) selective adsorption.…”

The Characterization and SCR Performance of Mn-Containing α-Fe2O3 Derived from the Decomposition of Siderite

“…It was reported that the band around 650 cm -1 was not a perfect spectrum of hematite (α-Fe 2 O 3 ) [54]. Some studies have found that the bands near 580-650 cm −1 can also be assigned to MnO 2 [55,56]. Therefore, the band at 650 cm -1 could also be ascribed to MnO 2 [10].…”