Facet control of manganese oxides with diverse redox abilities and acidities for catalytically removing hazardous 1,2-dichloroethane

Abstract

The preparation of four kinds of α-, β-, γ-, and δ-type MnO2 with distinct crystal phases and tunnel structures were achieved and applied for 1,2-dichloroethane (1,2-DCE) catalytic combustion. The redox...

Mining the Carbon Intermediates in Plastic Waste Upcycling for Constructing C–S Bond

“…After annealing, L-Cry-MnO 2 displays a similar nanosheet morphology to that of Amo-MnO 2 , indicating that the annealing process plays a minor role in altering the morphology of MnO 2 (Figure 2c, 2e, and Figures S2, S4). In contrast to Amo-MnO 2 , which lacks any crystalline characteristics, a lattice space of 0.34 nm was identified in L-Cry-MnO 2 (Figure 2e), indexed to the (002) plane of δ-MnO 2 39,40 (Figure 2d and Figure S5, Figure S6). These findings suggest that the crystallinity of Amo-MnO 2 was enhanced through annealing.…”

Temperature‐Controlled Hydrothermal Synthesis of α‐MnO2 Nanorods for Catalytic Oxidation of Cyclohexanone

“…The O1s spectra showed peaks around 529.8, 531.7 and 533.5 eV (Figure 7b). The peaks in region 529.8 eV correspond to the lattice oxygen in Mn‐O−Mn bond and the peaks near 531.7 eV indicate the surface adsorbed oxygen species [32,34, 37] . Whereas, the peak observed at 533.5 eV can be attributed to the surface hydroxyl groups [37] .…”

“…The peaks in region 529.8 eV correspond to the lattice oxygen in Mn-OÀ Mn bond and the peaks near 531.7 eV indicate the surface adsorbed oxygen species. [32,34,37] Whereas, the peak observed at 533.5 eV can be attributed to the surface hydroxyl groups. [37] The recorded core levels of all samples appeared to be nearly similar binding energy values thus further substantiating the presence of chemically uniform surface nature of the MnO 2 nanorods.…”

Effect of alkali/alkaline-earth-metal doping on the Co3O4 spinel structure and N2O decomposition

“…26–28 Most simple oxides, e.g. , MnO 2 , 29 Co 3 O 4 , 9 follow the simple heterogeneous exchange mechanism, which is also applicable to the oxygen isotope exchange reactions performed on the samples used in this study. The simple heterogeneous exchange mechanism means that only one oxygen atom from the solid phase is participating (or exchanging) in each step.…”

“…Therefore, the oxygen mobility of different samples can be compared by the temperature corresponding to the peak R max e : the lower the temperature corresponding to R max e is, the higher the oxygen mobility becomes. 28,29 During the OIE reaction, the 18 O atoms in the gas phase exchanges rapidly with the chemisorbed oxygen on the surface of the sample, and then secondarily with the surface lattice oxygen. At high temperatures (>500 °C), the deep bulk lattice oxygen diffuses to the surface for oxygen isotope exchange reactions.…”