La1-x(Sr, Na, K)xMnO3 perovskites for HCHO oxidation: The role of oxygen species on the catalytic mechanism

Abstract

perovskites for HCHO oxidation: the role of oxygen species on the catalytic mechanism, Applied Catalysis B:

Deep Insight into the Mechanism of Catalytic Combustion of CO and CH4 over SrTi1–xBxO3 (B = Co, Fe, Mn, Ni, and Cu) Perovskite via Flame Spray Pyrolysis

“…It infers a higher reducibility of these species when more Co elements are added to the structure of the perovskite . It is generally known that the initial H 2 consumption rate can be applied to evaluate the low-temperature reducibility in Figure b . The greater the Co dopant, the higher the initial H 2 consumption rate, suggesting that the partial substitution of Ti 4+ cations by Co 3+ or Co 2+ enhances the low-temperature reducibility of SrTiO 3 -based catalysts.…”

“…15 It is generally known that the initial H 2 consumption rate can be applied to evaluate the lowtemperature reducibility in Figure 4b. 46 The greater the Co dopant, the higher the initial H 2 consumption rate, suggesting that the partial substitution of Ti 4+ cations by Co 3+ The behavior of active oxygen is also responsible for the catalytic combustion performance. 47 O 2 -TPD is employed to feature the oxygen species characteristics of flame-made perovskites.…”

Ultrathin MnO2-Coated FeOOH Catalyst for Indoor Formaldehyde Oxidation at Ambient Temperature: New Insight into Surface Reactive Oxygen Species and In-Field Testing in an Air Cleaner

“…The surface lattice oxygen species of δ-MnO 2 was recently confirmed not to participate in ambient-temperature HCHO oxidation because the HCHO adsorption energy on surface lattice sites was too low to support HCHO oxidation. , Hence, the surface chemisorbed oxygen species and OH groups could oxidize HCHO into intermediate species (e.g., DOM, formate, carbonate). The consumed ROS could be continuously replenished by molecular O 2 or water vapor. , Recently, ROS generated from Fenton-like O 2 activation over Fe-MOF catalysts, including superoxide radicals ( • O 2 – ), hydroxyl radicals ( • OH), and singlet oxygen ( 1 O 2 ), were confirmed as active for HCHO oxidation . However, the specific role and contribution of the oxygen-free radical species in HCHO oxidation over Mn-based catalysts are still unidentified. − Although the role of ROS in HCHO oxidation is under debate, the performance of catalysts can be promoted by increasing the amount of ROS via the introduction of surface oxygen vacancies.…”

“…The consumed ROS could be continuously replenished by molecular O 2 or water vapor. 18,19 Recently, ROS generated from Fenton-like O 2 activation over Fe-MOF catalysts, including superoxide radicals ( • O 2 − ), hydroxyl radicals ( • OH), and singlet oxygen ( 1 O 2 ), were confirmed as active for HCHO oxidation. 20 However, the specific role and contribution of the oxygen-free radical species in HCHO oxidation over Mn-based catalysts are still unidentified.…”

HCOOH Electrosynthesis via Coelectrolytic Processes of CO2 Reduction and CH3OH Oxidation

“…As for the catalysts of anodic oxidation reaction, the La–Mn perovskites were found to exhibit good oxidation characteristics . The experimental investigation indicated that A-site or B-site metal-doped perovskites can increase the catalytic efficiency . Therefore, it is safe to believe that metal-doped La–Mn perovskites are excellent catalysts for converting CH 3 OH to HCOOH.…”