The Impact of Ceria Loading on the CuOx-CeO2 Interaction and Performance of AuCu/CeO2-SiO2 Catalysts in CO-PROX Reaction

Autor(es)

Rodrigues Fiuza, Tanna Elyn ^{[1, 2]} ; Goncalves, Danielle Santos ^[1] ; Zanchet, Daniela ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Inst Chem, BR-13083970 Campinas, SP - Brazil

^[2] Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Nanotechnol Natl Lab LNNano, BR-13083100 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: European Journal of Inorganic Chemistry; v. 2021, n. 40 OCT 2021.
• Citações Web of Science: 0

Resumo

The use of CeO2 as a promoter for non-reducible supports, such as SiO2, enhances the catalytic activity by facilitating the activation of species such as O-2 and H2O. However, in the case of the bimetallic nanoparticles (NPs), the presence of promoters may also influence the migration of the metallic species, dramatically impacting the stabilization of catalytic sites and as consequence, the overall catalytic performance. In the case of AuCu alloy supported catalysts, the reduced form, i. e., AuCu alloy, or the oxidized form, i. e., Au-CuOx species, present different activities/selectivities. Moreover, several parameters, such as reactional conditions, AuCu particle size, support nature, and pretreatments dictate which species are stabilized on the catalyst surface. The preferential oxidation of CO (CO-PROX) reaction, that takes place under the H-2-rich stream, favors the stabilization of the reduced form of the AuCu catalysts. However, the Cu distribution in the crystal lattice and the final composition of the AuCu NPs are dependent on the mobility of the Cu species on the support. In this work, we show that the loading of the CeO2 as a promotor in AuCu/SiO2 catalysts impacts the CeOx species and the Cu reincorporation into the Au lattice and consequently, the activity and stability of the catalysts under CO-PROX reaction. (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: 11/50727-9 - Desenvolvimento de sistemas para produção de hidrogênio e para geração e utilização de energia eletro-química
• Beneficiário: Ernesto Rafael Gonzalez
• Modalidade de apoio: Auxílio à Pesquisa - Temático