| Texto completo | |
| Autor(es): |
Catarine Santos Lopes Alencar
[1]
;
Ana Rita Noborikawa Paiva
[2]
;
Julio Cesar Martins da Silva
;
Jorge Moreira Vaz
[4]
;
Estevam Vitorio Spinacé
[5]
Número total de Autores: 5
|
| Afiliação do(s) autor(es): | [1] Instituto de Pesquisas Energéticas e Nucleares - Brasil
[2] Instituto de Pesquisas Energéticas e Nucleares - Brasil
[4] Instituto de Pesquisas Energéticas e Nucleares - Brasil
[5] Instituto de Pesquisas Energéticas e Nucleares - Brasil
Número total de Afiliações: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 23, n. 5 2020-10-23. |
| Resumo | |
Abstract Au/TiO2 (1wt% Au), Cu/TiO2 (1wt% Cu) and AuCu/TiO2 (1wt% AuCu) catalysts with different Au:Cu mass ratios were prepared in one-step synthesis using sodium borohydride as reducing agent. The resulting catalysts were characterized by X-ray diffraction (XRD), X-ray Dispersive Energy (EDX), Transmission Electron Microscopy (TEM) and Temperature Programmed Reduction (TPR) and tested for the preferential oxidation of carbon monoxide (CO-PROX reaction) in H2-rich gases. EDS analysis showed that the Au contents are close to the nominal values whereas for Cu these values are always lower. X-ray diffractograms showed only the peaks of TiO2 phase; no peaks of metallic Au and Cu species or oxides phases were observed. TPR and high-resolution TEM analysis showed that AuCu/TiO2 catalysts exhibited most of Au in the metallic form with particles sizes in the range of 3-5 nm and that Cu was found in the form of oxide in close contact with the Au nanoparticles and well spread over the TiO2 surface. The AuCu/TiO2 catalysts exhibited good performance in the range of 75-100 °C and presented a better catalytic activity when compared to the monometallic ones. A maximum CO conversion of 98.4% with a CO2 selectivity of 47% was obtained for Au0.50Cu0.50/TiO2 catalyst at 100oC. (AU) | |
| Processo FAPESP: | 14/09087-4 - Estudos sobre o uso do bioetanol em células a combustível do tipo PEMFC e SOFC |
| Beneficiário: | Marcelo Linardi |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 14/50279-4 - Brasil research centre for gas innovation. (fapesp-bg brasil) |
| Beneficiário: | Julio Romano Meneghini |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa Centros de Pesquisa Aplicada |
| Processo FAPESP: | 17/11937-4 - CINE-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 Aplicada |