Methane conversion coupled with hydrogen production from water using Au/Ga₂O₃ photocatalysts prepared by different methods

Autor(es)

Januario, Eliane R. ; Carminati, Saulo A. ; Tofanello, Aryane ; da Silva, Bruno L. ; Silvaino, Patricia F. ; Machado, Arthur P. ; Vaz, Jorge M. ; Spinace, Estevam V.

• Tipo de documento: Artigo Científico
• Fonte: SUSTAINABLE ENERGY & FUELS; v. 7, n. 17, p. 9-pg., 2023-07-18.

Resumo

Au/Ga2O3 photocatalysts were prepared by three different methods (pre-formed Au nanoparticles, borohydride reduction, and impregnation-H-2 reduction) and tested as photocatalysts for methane conversion coupled with hydrogen production from water. The photocatalysts were characterized by X-ray fluorescence, X-ray diffraction, UV-vis, scanning and transmission electron microscopy, X-ray photoelectron spectroscopy, and PL spectroscopy. The reactions were performed with the photocatalysts dispersed in water in a bubbling methane stream under UV-light illumination. The products were identified and quantified by gas chromatography (GC-FID/TCD/MSD). The main products formed were H-2, C2H6, CO, and CO2 with minor quantities of C2H4, C3H8, and C4H10. The best performances were observed for the photocatalysts prepared with the nominal Au content of 0.1 wt% regardless of the method used. A production rate of about 100 & mu;mol g(-1) h(-1) for C2H6 and 15 000 & mu;mol g(-1) h(-1) for H-2 was obtained. The Au content, nanoparticle sizes and interactions with Ga2O3 strongly influenced the photocatalytic activity. (AU)

• Processo FAPESP: 21/01896-4 - Desenvolvimento de fotocatalisadores de TiO2/WO3 dopados para a conversão de metano a produtos de alto valor agregado acoplado com a evolução de hidrogênio da água
• Beneficiário: Saulo do Amaral Carminati
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 18/04595-2 - EMU concedido no projeto 2017/11937-4: sistema experimental de conversão eletroquímica do metano
• Beneficiário: Fabio Coral Fonseca
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários
• Processo FAPESP: 18/04596-9 - EMU concedido no projeto 2017/11937-4: sistema experimental de conversão termoquímica do metano
• Beneficiário: Fabio Coral Fonseca
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários
• Processo FAPESP: 17/11937-4 - Rota sustentável para a conversão de metano com tecnologias eletroquímicas avançadas
• Beneficiário: Fabio Coral Fonseca
• Modalidade de apoio: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia