HCHO oxidation over the δ-MnO2 catalyst: Enhancing oxidative activities of surface lattice oxygen and surface adsorbed oxygen by weakening Mn-O bond

Innovative α-MnO2/Nanocarbon Ball Additive for Enhancing the Molecular Structure, Emission Control, and Engine Performance of Diverse Biodiesel Generations

“…Increasing the surface area enhances fuel–air mixing and combustion efficiency, leading to a more complete fuel oxidation and reduced formation of unburned hydrocarbons, thereby contributing to HC reduction . The presence of an oxygen lattice within the additive promotes improved combustion efficiency and facilitates more complete fuel oxidation, minimizing the formation of unburned hydrocarbons . Oxygen adsorption on the additive’s surface creates an oxygen-rich environment, enhancing fuel combustion and reducing the production of unburned hydrocarbons, supporting HC reduction .…”

Manganese oxide-based catalysts for the sustainable synthesis of value-added chemicals through oxidation processes: a critical review and perspectives for the future

“…Zhou et al 57 demonstrated the ability to induce a phase transition from polymorphic δ to α in MnO 2 by controlling the hydrothermal reaction time through a one-step hydrothermal method. Wang et al 58 employed a novel method to produce ultra-thin δ-MnO 2 by the hydrothermal treatment of pure KMnO 4 , which does not require the use of a template, oxidative agent, or additional Mn precursor. They found that δ-MnO 2 exhibited a notably weakened Mn–O bond and OVs when compared to β- and γ-MnO 2 (Fig.…”

NaBH4 reduced Mn-doped cobalt tetroxide R-MnxCo3−xO4 catalysts with plentiful oxygen vacancies for HCHO oxidation at low temperature

“…Research has shown that once manganese (Mn) atoms are doped into the lattice of Co 3 O 4 , the doped atom Mn will replace the Co atom and generate oxygen vacancies, which helps to enhance the formaldehyde oxidation performance of the catalyst. [33][34][35] In addition to atomic doping, another important strategy for improving Co 3 O 4 oxidation catalytic performance is to create more V o . The multiple variable valence states of CoO x (Co 2+ , Co 3+ and Co 4+ ) facilitate the formation of oxygen defect structures, providing abundant opportunities for V o generation and improving the oxidation activity of Co 3 O 4 .…”