High performance ozone decomposition spinel (Mn,Co)3O4 catalyst accelerating the rate-determining step

High performance ozone decomposition over MnAl-based mixed oxide catalysts derived from layered double hydroxides

“…The reduction of manganese oxides can be described by the successive reduction processes: MnO 2 → Mn 2 O 3 → Mn 3 O 4 → MnO. 19 The first reduction peak (200–350 °C) is attributed to the reduction of MnO 2 to Mn 3 O 4 . The second reduction peak (350–500 °C) is ascribed to the reduction of Mn 3 O 4 to MnO.…”

“…The reduction of manganese oxides can be described by the successive reduction processes: MnO 2 / Mn 2 O 3 / Mn 3 O 4 / MnO. 19 The rst reduction peak (200-350 ) is ascribed to the reduction of Mn 3 O 4 to MnO. For the Mn 2 AlO-400 catalyst, the maximum H 2 consumption occurs at 308 C and 409 C. Increasing the Mn/Al molar ratio shis the reduction peaks toward higher temperature.…”

“…13,14 Catalysts mainly includes noble metal catalysts (e.g., Ag, Au, Pt, Pd) [15][16][17][18] and transition metal catalysts (e.g., Mn, Co, Ni, Fe). 3,[19][20][21][22][23] Noble metal catalysts have excellent activity for O 3 decomposition, as well as excellent moisture resistance, and have attracted the attention of many researchers, but the high cost limits their wide applications. 24 Manganese oxides (MnO x ) are commonly used as the active components for ozone decomposition due to their economic and environmental benets, diverse structures, simple preparation, and excellent physicochemical properties.…”

β-Co(OH)2 Nanostructures with High Spin Co(II) in Distorted [CoO6] for Catalytic Ozone Decomposition

“…Noble metals, such as Ag, Au, and Pt, show high ozone decomposition efficiency even in humid conditions, but the high price limits their wide application. Transition metal oxides, such as MnO 2, − Cu 2 O, Fe 2 O 3, NiO, and Co 3 O 4 , , show relatively high ozone elimination efficiency and low cost and thus have been a research focus. However, in highly humid conditions, the water vapor tends to adsorb to their surface, thus reducing the performance. , Therefore, it is desirable to develop high-performance ozone catalysts especially under humid conditions.…”

“…41 The existence of O 2 2− and neutral O 2 on β-Co(OH) 2 proves that both dissociation of O 2 2− to form O 2 and desorption of molecular oxygen are slow (i.e., step 3 of ozone decomposition), which is in good agreement with the literature. 16,40,45 In addition, the accumulation of O 2− and O 2 − means that the reaction of ozone with O − (eq 8) is easy but that with O 2− (eq 9) is hard. Compared with β-Co(OH) 2 , there is no O 2− species on α-Co(OH) 2 , meaning that the elementary reaction of eq 5 cannot react on it.…”