Regenerable α-MnO2 nanotubes for elemental mercury removal from natural gas

Catalytic oxidation of NO over MnOx–CoOx/TiO2 in the presence of a low ratio of O3/NO: activity and mechanism

“…The corresponding binding energies (eV) and relative composition ratios (%) are listed in Table 6. The peaks at around 529.89 eV were assigned to lattice oxygen O a , 33 This variation trend was consistent with the result of O 2 -TPD, which conrmed that 15%MnO x -CoO x (2 : 1)/TiO 2 contained the largest amount of oxygen vacancies among the four catalysts, and was advantageous to adsorb oxygen species to be used in catalytic oxidation reaction. The XPS spectra of the used 15%MnO x -CoO x (2 : 1)/TiO 2 catalyst aer the separate adsorption of O 3 and NO, and the coadsorption of O 3 and NO at 100 C are shown in Fig.…”

Revealing the Atomic Structures of Exposed Lateral Surfaces for Polymorphic Manganese Dioxide Nanowires

“…It is worth mentioning that, based on similar HRTEM results of MnO 2 nanowires along their radial direction, previous studies have directly ascribed the observed planes to be the exposed outmost facets and to be further responsible for specific functional properties. [ 13,22,23,25,28–31,33–35,42–46 ] Without direct axial imaging, the deduction of exposed lateral facets solely based on radial TEM imaging in these studies could be plagued by the random sample orientation and the unknown cross‐sectional shape of the nanowires. We further corroborate this statement as later discussed in Figure 4 showing the axial imaging of α‐MnO 2 nanowire, where α‐(310) planes observed via radial TEM imaging in Figure S1, Supporting Information, are not actually seen as the exposed lateral facets.…”

“…The accuracy of radially projected TEM imaging in indexing the faceted lateral surfaces of one nanowire could be easily compromised, because any {hkl} plane parallel to the nanowire axis can be inaccurately identified as the lateral facet if it happens to be tilted to align parallel to the electron beam and thus clearly forms a lattice image. Consequently, although targeting the same phase, e.g., α‐MnO 2 nanowires, which are synthesized using a similar hydrothermal approach, various studies have identified the exposed lateral facet(s) to be either {200}, or {110}, or {310}, or {210}, or {211}, [ 5,22–35 ] increasing the uncertainty of the establishment of an accurate surface structure–property relationship.…”

Enhanced activity and SO2 resistance of Co‐modified CeO2‐TiO2 catalyst prepared by facile co‐precipitation for elemental mercury removal in flue gas

“…A variety of transition metal oxide catalysts for mercury oxidation, such as Mn, Cu, Fe, V, Ce and Co, have been employed in experiments. Ce‐based catalyst is regarded as one of the best candidates for Hg 0 oxidation removal with O 2 as the oxidant due to its active and facile Ce 3+ /Ce 4+ redox cycle and the corresponding outstanding oxygen storage capacity .…”