Data/hora: 21/06/2024 21:49:53

Biblioteca(s): | Embrapa Instrumentação.
Data corrente: | 01/12/2022
Data da última atualização: | 01/12/2022
Autoria: | SILVA, M. A. R. da; SILVA, I. F.; XUE, Q.; LO, B. T. W.; TARAKINA, N. V.; NUNES, B. N.; ADLER, P.; SAHOO, S. K.; BAHNEMANN, D. W.; LÓPEZ-SALAS, N.; SAVATEEV, A.; RIBEIRO, C.; KÜLNE, T. D.; ANTONIETTI, M.; TEIXEIRA, I. F.
Afiliação: | CAUE RIBEIRO DE OLIVEIRA, CNPDIA.
Título: | Sustainable oxidation catalysis supported by light: Fe-poly (heptazine imide) as a heterogeneous single-atom photocatalyst.
Ano de publicação: | 2022
Fonte/Imprenta: | Applied Catalysis B: Environmental, v. 304, a120965, 2022.
Páginas: | 1 - 11
ISSN: | 0926-3373
DOI: | https://doi.org/10.1016/j.apcatb.2021.120965
Idioma: | Inglês
Conteúdo: | 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&#8722; N &#8722; 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.
Palavras-Chave: | Benzene Oxidation; Poly (heptazine imide); Single-atom catalysis.
Categoria do assunto: | --
Registro original: | Embrapa Instrumentação (CNPDIA)
Exemplares: | CNPDIA - (18148-1) - UPC - AP - DD - PROCI.22/176 -  - 2022/181 - DIS