One-step synthesis of AuCu/TiO2 catalysts for CO preferential oxidation
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2020
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Materials Research
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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 100°C.
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ALENCAR, CATARINE S.L.; PAIVA, ANA R.N.; SILVA, JULIO C.M. da; VAZ, JORGE M.; SPINACE, ESTEVAM V. One-step synthesis of AuCu/TiO2 catalysts for CO preferential oxidation. Materials Research, v. 23, n. 5, p. 1-6, 2020. DOI: 10.1590/1980-5373-MR-2020-0181. Disponível em: http://200.136.52.105/handle/123456789/31629. Acesso em: 25 Apr 2024.
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