The Effect of SnO2 Surface Properties on CO2 Photoreduction to Higher Hydrocarbons

Autor(es)

Torres, Juliana. A. A. ; Nogueira, Andre E. ; da Silva, Gelson T. S. T. ; Ribeiro, Caue

• Tipo de documento: Artigo Científico
• Fonte: CHEMCATCHEM; v. 15, n. 6, p. 9-pg., 2023-03-03.

Resumo

Several photocatalysts have been developed for applications in reduction reactions, including tin oxide-based semiconductors. Although its band structure is unfavorable for CO2 reduction reactions, strategies to modify its surface properties directly impacted its activity and selectivity during these reactions. Here, we analyze the influence of heat treatment and decoration of SnO2 with gold nanoparticles on the gas phase CO2 photoreduction process. In both cases, a deleterious effect was observed during reactions under UV radiation (with a drop of 59.81 % and 51.45 % in CH4 production for SnO2_150 degrees C and SnO2/Au_cop, respectively, compared to SnO2_cop), which is directly related to the availability of surface hydroxyl groups that play a crucial role in CO2 adsorption. Under visible radiation, the gold plasmonic resonance took place in the production of methane (0.33 mu mol g(-1) for SnO2/Au_cop and 0.29 mu mol g(-1) for SnO2/Au_150 degrees C), with small amounts of carbon monoxide (0.06 mu mol g(-1) for SnO2/Au_cop and 0.03 mu mol g(-1) for SnO2/Au_150 degrees C). These results demonstrate that, though the SnO2 band structure does not indicate a good semiconductor for CO2 reduction, its surface characteristics are responsible for its catalytic activity. (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: 16/21515-7 - Desenvolvimento de heteroestruturas de óxido de magnésio com ZnO e TiO2 para aplicação em processos de fotossíntese artificial
• Beneficiário: Juliana Arriel Torres
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 20/15230-5 - Centro de Pesquisa e Inovação de Gases de Efeito Estufa - RCG2I
• Beneficiário: Julio Romano Meneghini
• Modalidade de apoio: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia