Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 304, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2021.120965
Keywords
Single-atom catalysis; Photooxidation; Benzene Oxidation; Iron; Poly (heptazine imide)
Funding
- Alexander von Humboldt Foundation
- CAPES/Alexander von Humboldt Foundation for Experienced Researchers Fellowship : Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior-CAPES [88881.145566/2017-1, 88881.368085/2019-01]
- Return Fellowship
- Max Planck Society
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior-CAPES
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico-CNPq [423196/2018-9]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo-FAPESP [2020/14741-6, 2018/012585, 2021/11162-8]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior-CAPES, Brazil, from the CAPES/DAAD/CNPQ program [15/2017, 88887.161403/2017-00]
- Saint-Petersburg State University [73032813]
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This study presents an alternative method for the preparation of highly active Fe single-atom catalysts (SACs) with Fe-N4 sites, which exhibit high selectivity in the oxidation of C-H bonds. The catalyst obtained through ion exchange can effectively oxidize C-H bonds to ketones under light irradiation.
Fe-N-C materials, when prepared as single-atom catalysts (SAC), display excellent activities in oxidation reactions. The systematic investigation of the iron coordination mode revealed that Fe-N4C catalysts are the most active for C-H bond oxidation. However, many of these catalysts are synthesized through pyrolysis, which is characterized by a lack of control and structures with heterogeneous composition, rarely presenting only atomically dispersed Fe-N-C as active sites. Herein, an alternative, reliable and easily reproducible method to obtain highly active Fe SACs (atomically dispersed) with Fe-N4 sites is presented, which is based on ion exchange of sodium from high crystalline sodium poly(heptazine imide) (Na-PHI) by other ions. The obtained catalyst can photocatalytically oxidize C-H bonds selectively toward ketones using only dioxygen. Detailed mechanism investigations indicate that the active species in the C-H bond oxidation are highly valent Fe(IV)/Fe(V)-oxo species, which are further activated by the holes generated at the PHI support under light irradiation.
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