Structural and chemical disorder of cryptomelane promoted by alkali doping: Influence on catalytic properties

Extremely efficient full solar spectrum light driven thermocatalytic activity for the oxidation of VOCs on OMS-2 nanorod catalyst

“…The relative OVD concentration is also determined by the average oxidation state (AOS) of Mn in the OMS-2 samples, which can be calculated by using the magnitude of Mn 3s multiplet splitting ( Fig. S3) according to the following formula [37,39]:…”

“…When the temperature reaches to the light-off temperature of thermocatalytic oxidation on the OMS-2 catalysts, the thermocatalytic reaction starts. The thermocatalytic oxidation on OMS-2 proceeds via the well-known Mars-van Krevelen mechanism [34][35][36][37]: organic molecules adsorbed on catalyst surface are oxidized by lattice oxygen, and the resultant oxygen vacancies are subsequently replenished by gas-phase O 2 . The lattice oxygen activity of OMS-2 plays a decisive role in the thermocatalytic activity as the reoxidation of reduced OMS-2 is much faster than the reduction of OMS-2 [35,36].…”

“…Because of its unique structural characteristics, OMS-2 has been extensively investigated for diverse applications of thermocatalytic oxidation such as chemical synthesis, cleanup of organic pollutants [29][30][31][32][33][34][35][36][37]. Recently, we developed an approach of hydrothermal redox reaction to prepare OMS-2 nanorods with tunable concentration of oxygen vacancy defects (OVDs).…”

Gas phase Catalytic Oxidation of VOCS using Hydrothermally Synthesized Nest-like K-OMS 2 Catalyst

“…The same result was obtained by Santos et al (2009) where they observed a strong adsorption of toluene to cause a decrease in the catalytic activity. This was explained in their other study (Santos et al 2012) where they found Although the lack of fit for both toluene and benzene decomposition were both significant, it was caused by the computed values which were greater than 100% while the maximum experimental value was only 100%. In addition to this, since the runs were just repeated measurements for every GHSV and reaction temperature setting, the pure error may have been underestimated which caused it to be much lower than its real value.…”

Regenerable magnetic octahedral layer catalyst for gaseous UPOPs removal

“…Alkali metal could significantly changes the physicochemical properties of Pt/TiO 2 (facilitate the dispersion of Pt and introduce surface hydroxyl [42]), and cryptomelane (enhance redox properties and increase surface basicity [43]), resulted in the enhanced oxidative activity. However, none of these researches found that the alkali metal participate the catalytic reaction.…”