Splitting dioxygen over distant binuclear transition metal cationic sites in zeolites. Effect of the transition metal cation

0539847 - ÚFCH JH 2022 RIV US eng J - Journal Article
Dědeček, Jiří - Tabor, Edyta - Andrikopoulos, Prokopis C. - Sklenák, Štěpán
Splitting dioxygen over distant binuclear transition metal cationic sites in zeolites. Effect of the transition metal cation.
International Journal of Quantum Chemistry. Roč. 121, č. 10 (2021), č. článku e26611. ISSN 0020-7608. E-ISSN 1097-461X
R&D Projects: GA ČR(CZ) GA17-00742S; GA ČR(CZ) GA19-02901S
Institutional support: RVO:61388955
Keywords : alpha oxygen * density functional calculations * splitting dioxygen * vasp * zeolites
OECD category: Physical chemistry
Impact factor: 2.437, year: 2021
Method of publishing: Limited access

Splitting dioxygen to yield highly active oxygen species attracts enormous attention due to its potential in direct oxidation reactions, mainly in transformation of methane into valuable products. Distant binuclear cationic Fe(II) centers in Fe-ferrierite have recently been shown to be active in splitting dioxygen at room temperature to form very active oxygen species able to oxidize methane to methanol at room temperature as well. Computational models of the distant binuclear transition metal cationic sites (Co(II), Mn(II), and Fe(II)) stabilized in the ferrierite matrix were investigated by periodic density-functional theory calculations including molecular dynamics simulations. The results reveal that the M(II) cations capable of the M(II)> M(IV) redox cycle with the M horizontal ellipsis M distance of ca 7.4 angstrom stabilized in two adjacent beta sites of ferrierite can split dioxygen. Our study opens the possibility of developing tunable zeolite-based systems for the activation of dioxygen employed for direct oxidations.
Permanent Link: http://hdl.handle.net/11104/0317548