Spontaneous generation of singlet oxygen on microemulsion-derived manganese oxides with rich oxygen vacancies for efficient aerobic oxidation

Abstract

Developing innovative catalysts for efficiently activating O2 into singlet oxygen (1O2) is a cutting-edge field with the potential to revolutionize green chemical synthesis. Despite its promise, practical implementation remains a...

Sunlight-driven and gram-scale vanillin production via Mn-defected γ-MnO2 catalyst in aqueous environment

“…Typically, unsaturated metal species and O d species, which are active in various oxidation reactions, coexist in metal oxides. 30,31 It is well known that Mn d , caused by coordination unsaturation between lattice oxygen and lattice Mn, can be tuned by inducing O d or adjusting non-metal dopant amounts. 32–34 Contrary to the almost constant presence of O d species (Fig.…”

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

“…This structural versatility makes MnO x catalysts versatile and effective for a range of applications. 2,4,8,9,12,17,24 One of the key advantages of MnO x catalysts is their ability to promote redox reactions. The presence of different oxidation states enables MnO x to easily switch between different valence states, facilitating the transfer of electrons during chemical reactions.…”

“…Aerobic oxidation of alcohols to aldehydes/ketones. Liquid oxidation of alcohols refers to the chemical process in which alcohols are converted into the corresponding carbonyl compounds, 8,10,82 such as aldehydes or ketones, through the addition of an oxidizing agent in a liquid medium. MnO x -catalyzed aerobic oxidation of alcohols was recently developed as a potential sustainable methodology for producing high valueadded carbonyl compounds (Table 2).…”

“…The initial reduction rates per surface area of MnO 2 follow the order of γ-MnO 2 (33.77 H 2 μmol per h per m 2 ) < δ-MnO 2 (42.71 H 2 μmol per h per m 2 ) < α-MnO 2 (64.43 H 2 μmol per h per m 2 ) < β-MnO 2 (280.19 H 2 μmol per h per m 2 ). Very recently, we reported the synthesis of interstitial N-doped nano-MnO 2 by compartmentalized-microemulsion crystallization, 8 and found that the concentration of surface oxygen atoms in the vicinity of OVs reached 51.1%. It is verified that the spontaneous generation of 1 O 2 , even in the absence of light, underscores its crucial role in aerobic oxidation.…”

“…The sustainable synthesis of value-added chemicals using MnO x -based heterogeneous catalysts has gained attention due to its potential applications in various chemical reactions. [1][2][3][4][5][6][7][8][9][10][11] These catalysts offer advantages such as low cost, abundant availability, ease of synthesis, and eco-friendly nature. In the past five years, significant advancements have been made in the synthesis of value-added chemicals using these catalysts.…”