Photo-assisted oxidation of gaseous benzene on tungsten-doped MnO2 at lower temperature

Recent Progress of Thermocatalytic and Photo/Thermocatalytic Oxidation for VOCs Purification over Manganese-based Oxide Catalysts

“…The same phenomenon occurs in Fe-doped OMS-2. 175 Wang et al 176 prepared tungsten (W)-doped MnO 2 and evaluated photoassisted thermal catalytic performance for benzene oxidation under the irradiation of xenon-lamp. W doping can introduce abundant oxygen vacancies and additional reactive oxygen species are generated by photoassisted effect, which results in enhancement of catalytic activity.…”

Recent progresses in the synthesis of MnO2 nanowire and its application in environmental catalysis

“…For the pristine MnO 2 , benzene was hardly decomposed below 200 C and only $40% conversion was achieved at 400 C. Whereas, as for the Ce-MnO 2 and Cu-MnO 2 catalysts, the benzene started to decompose around 100 C and nearly all benzene could be removed around 250 C. Moreover, the Cu-MnO 2 catalyst also exhibited high resistance to hightemperature deactivation and water resistance during continuous long-term testing. Recently, Ma et al 148 synthesized the tungsten-doped MnO 2 (W-MnO 2 ) with excellent performance of the photo-assisted thermal catalytic oxidation/removal of benzene. They found that doping W could not only generate abundant oxygen vacancies in MnO 2 , but also produce strong covalent interactions with adjacent O atoms through W-O bridge bonds, thereby promoting O 2 polarization and electron transference.…”

“…Moreover, the Cu–MnO 2 catalyst also exhibited high resistance to high-temperature deactivation and water resistance during continuous long-term testing. Recently, Ma et al 148 synthesized the tungsten-doped MnO 2 (W–MnO 2 ) with excellent performance of the photo-assisted thermal catalytic oxidation/removal of benzene. They found that doping W could not only generate abundant oxygen vacancies in MnO 2 , but also produce strong covalent interactions with adjacent O atoms through W–O bridge bonds, thereby promoting O 2 polarization and electron transference.…”

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.…”