| Texto completo | |
| Autor(es): |
de Oliveira, Jessica A.
;
da Cruz, Jean C.
;
Nascimento, Otaciro R.
;
Ribeiro, Caue
Número total de Autores: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | APPLIED CATALYSIS B-ENVIRONMENTAL; v. 318, p. 10-pg., 2022-08-20. |
| Resumo | |
Herein, we propose that an efficient CH4 partial photooxidation to methanol depends on appropriate band edge positions in photocatalysts. We demonstrated our hypothesis using Bi2O3 since this semiconductor have a valence band favorable to produce .OH and a conduction band not advantageous to O-2.- which is crucial to keep O-2 available for .CH3 capture and CH3OH formation. A notably and selective partial photooxidation of methane to methanol was observed under visible light at room temperature and pressure. As a result, the productivity of methanol over Bi2O3 can reach approximately 3771 mu mol g(-1) h(-1) with c.a. 65% selectivity avoiding over -oxidation to CO2. Isotope labeling experiment ((CH4)-C-13) confirmed that methane acts as the carbon source of methanol and ESR measurements proved the .CH3 and .OH generation. Besides, Bi2O3 exhibited good stability after 5 cycles maintaining a high and selective methanol production. These results provide insight into critical photocatalyst properties for the partial photooxidation of methane to methanol. (AU) | |
| Processo FAPESP: | 18/01258-5 - Novos processos catalíticos e fotocatalíticos para a conversão direta de metano e CO2 em produtos |
| Beneficiário: | José Maria Correa Bueno |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 19/21496-0 - Desenvolvimento de sistema fotoeletrocatalítico para conversão de CO2 e CH4 a produtos com valor agregado |
| Beneficiário: | Jéssica Ariane de Oliveira |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |