Boosting total oxidation of acetone over spinel MCo2O4 (M = Co, Ni, Cu) hollow mesoporous spheres by cation-substituting effect

Effect of Co Doping on Magnetic and CO-SCR Properties of γ-Fe2O3

“…At 530 eV (O α ), the main band forms, which is the lattice oxygen (O 2– ) bound to metal cations. The shoulder peak at 531.2 eV (O β ) is treated as chemisorbed oxygen (O – , O 2 2– ), and the last peak at 533.8 eV is generally assigned to the hydroxyl oxygen on the surface (O γ ). , It is generally believed that the surface-adsorbed oxygen (O β ) is easier to move and participate in the reaction than lattice oxygen O α , which promotes the catalytic process of the NO and CO reaction. The XPS results further confirm the conclusion that Co ions enter the Fe 2 O 3 cell in the form of Co 2+ and form γ- x CoFe 2 O 3 .…”

Insight into the pH effect on the oxygen species and Mn chemical valence of Co–Mn catalysts for total toluene oxidation

“…38 It was also observed that when the pH of the precipitation varied, the main peak (Mn-O vibrations) shifted negatively due to the formation of lattice defects in the bulk. 39,40 For instance,…”

Study on mesoporous catalysts for oxidation of volatile organic compounds

“…The enhanced catalytic activity can be ascribed to the magnified specific surface area, increased amounts of weak acidic sites, and further abundant surficial Co 2+ and adsorbed oxygen species originated from acid treatment, announcing acid treatment could be a promising route to obtained mesoporous Co 3 O 4 with excellent physicochemical properties and admirable catalytic ability. Zhang et al ( [20]) synthesized MCo 2 O 4 (M=Cu, Ni, Co) hollow mesoporous spheres (HMS) via solvothermal alcoholysis approach for total oxidation of acetone. In detail, CuCo 2 O 4 HMS catalyst presented the best efficiency towards total oxidation of acetone, and NiCo 2 O 4 also showed a preferred performance compared with CoCo 2 O 4 .…”