| Texto completo | |
| Autor(es): |
Fiuza, Tanna Elyn Rodrigues
[1]
;
Gonsalves, Danielle Santos
[1]
;
Gomes, Igor Ferreira
[1]
;
Zanchet, Daniela
[1]
Número total de Autores: 4
|
| Afiliação do(s) autor(es): | [1] Univ Campinas UNICAMP, Inst Chem, POB 6154, BR-13083970 Campinas, SP - Brazil
Número total de Afiliações: 1
|
| Tipo de documento: | Artigo Científico |
| Fonte: | CATALYSIS TODAY; v. 381, p. 171-180, DEC 1 2021. |
| Citações Web of Science: | 1 |
| Resumo | |
In CO oxidation, Cu/CuOx species are known to increase the catalytic activity and improve the sinteringresistance of Au supported catalysts, particularly in the case of non-reducible oxide supports such as SiO2. Nonetheless, there is a lack of detailed information about the impact of Cu species on the stability of Au nanoparticles (NPs) supported on CeO2, one of the most important reducible oxide supports used in catalysis. Due to the reducibility of this oxide, the stability of the metallic phase and the metal-support interaction are strongly dependent on the atmosphere, i.e., oxidizing or reducing conditions. Besides, how residual contaminants from the preparation of the catalysts, such as chlorine, may affect the catalytic activity is not clear for the AuCu/CeO2 system. In this work, we used Au and AuCu colloidal NPs with initially well-defined size and shape to produce model CeO2 supported catalysts to better comprehend the role of the Cu and chlorine on the sintering-resistance of Au NPs and its impact in the catalytic performance of CO oxidation (CO-OX). We show that while the activation of the catalysts by hydrogen enhanced the sintering-resistance of the metallic phase in AuCu/CeO2, activation by oxygen was more effective to generate the most active sites. The presence of chlorine induced the sintering of the metallic phase, particularly after the activation by hydrogen. Besides, the results suggest that the chlorine partially poisoned the Au-CuOx-CeO2 interfacial species, decreasing the catalytic performance. (AU) | |
| 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 |
| 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: | 19/11800-4 - Síntese de catalisadores de Ni a partir de complexos organometálicos para a reação de bireforma do metano |
| Beneficiário: | Igor Ferreira Gomes |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado Direto |