Selective CH4 reform to methanol through partial oxidation over Bi2O3 at room temperature and pressure

Autor(es)

de Oliveira, Jessica A. ; da Cruz, Jean C. ; Nascimento, Otaciro R. ; Ribeiro, Caue

• 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