| Texto completo | |
| Autor(es): |
Ferreira, Larissa E. R.
;
Strapasson, Guilherme B.
;
Kuhl-Soares, Guilherme
;
Rodella, Cristiane Barbieri
;
Muraca, Diego
;
Rossi, Liane Marcia
;
Zanchet, Daniela
Número total de Autores: 7
|
| Tipo de documento: | Artigo Científico |
| Fonte: | ACS SUSTAINABLE CHEMISTRY & ENGINEERING; v. 13, n. 51, p. 14-pg., 2025-12-16. |
| Resumo | |
CO2 is one of the primary greenhouse gases, and its catalytic hydrogenation to ethanol represents a promising strategy for both CO2 mitigation and the production of value-added chemicals. However, the high thermodynamic stability of CO2, along with the challenges of C-C coupling and selectivity control, makes this transformation particularly demanding. In this work, we investigate a series of Co10-xCux/MgAl2O4 catalysts (x = 0, 1, 5, 9, and 10, with total metal loading of 10 wt %) as catalysts for CO2 hydrogenation to alcohols, exploring the impact of chemical composition and metal-oxide interfacial properties. Insights from related reactions, such as ethanol steam reforming (ESR) and the reverse water gas shift (RWGS) reaction at ambient pressure, were used to support the understanding of Co and Cu site roles in CO2 hydrogenation. Among the tested catalysts, prereduced Co5Cu5 exhibited the highest performance under high-pressure conditions, achieving productivities of 29 mg MeOH g(CoCu)(-1) h(-1) and 6 mg EtOH g(CoCu)(-1) h(-1). A prereduction step led to the formation of a CoCu alloy and modifications in the Co/Cu surface ratio, which contributed to enhanced catalytic activity. Co5Cu5 displayed the best balance between activity and selectivity, while Na promotion enabled C2+ alcohol formation, demonstrating the tandem action of Cu-0 and CoCu alloy sites. These findings highlight the synergistic effects of Co-Cu interactions and alkali metal promotion in tuning catalyst reducibility and improving selectivity toward higher alcohols. (AU) | |
| 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 Aplicada |
| Processo FAPESP: | 23/09379-4 - Estudos mecanístico e de superfície das reações de hidrogenação de CO2 e reforma a vapor de etanol em nanoestruturas do tipo M-CeO2/TiO2 (M: NixCuyCoz) |
| Beneficiário: | Larissa Evelin Ricardo Ferreira |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| 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: | 20/12986-1 - Design de catalisadores de níquel suportados em nanoestruturas 1D à base de TiO2/Nb2O5 |
| Beneficiário: | Guilherme Boenny Strapasson |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado Direto |
| Processo FAPESP: | 24/00998-6 - Centro de Pesquisa e Inovação de Materiais Inteligentes e Quânticos (CRISQuaM) |
| Beneficiário: | Daniel Mario Ugarte |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs |