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Preparation of Au/TiO2 by a facile method at room temperature for the CO preferential oxidation reaction

Leal, Georgia Barbalho ; Ciotti, Ligia ; Watacabe, Beatriz Naomy ; Loureiro da Silva, Daniela C. ; Antoniassi, Rodolfo M. ; Silva, Júlio César M. ; Linardi, Marcelo ; Giudici, Reinaldo ; Vaz, Jorge Moreira ; Spinacé, Estevam V.

Catalysis communications, 2018-11, Vol.116, p.38-42 [Periódico revisado por pares]

Elsevier B.V

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  • Título:
    Preparation of Au/TiO2 by a facile method at room temperature for the CO preferential oxidation reaction
  • Autor: Leal, Georgia Barbalho ; Ciotti, Ligia ; Watacabe, Beatriz Naomy ; Loureiro da Silva, Daniela C. ; Antoniassi, Rodolfo M. ; Silva, Júlio César M. ; Linardi, Marcelo ; Giudici, Reinaldo ; Vaz, Jorge Moreira ; Spinacé, Estevam V.
  • Assuntos: Au nanoparticles ; Carbon monoxide ; CO-PROX reaction ; Hydrogen ; TiO2
  • É parte de: Catalysis communications, 2018-11, Vol.116, p.38-42
  • Descrição: A simple strategy was used to prepare Au/TiO2 catalyst at room temperature. Au nanoparticles were initially prepared in solution using HAuCl4.3H2O as Au precursor, sodium citrate as stabilizing agent and sodium borohydride as reducing agent. The preformed Au nanoparticles were further supported on TiO2 and the resulting solid material was characterized by Energy-dispersive X-ray spectroscopy, X-ray diffraction and Transmission Electron Microscopy and tested for the preferential oxidation of carbon monoxide in hydrogen-rich stream (CO-PROX reaction). The obtained Au/TiO2 catalyst consisted of Au nanoparticles with an average size of ~ 4 nm and showed excellent catalytic performance in the 20-50 °C low-temperature range. In particular, at 40 °C a CO conversion of 99.5% and CO2 selectivity of 45% were obtained using an O2/CO ratio of 2 (1 vol% CO, λ = 4) and 97 vol% H2 in the feed gas stream (GHSV = 15,000 mL gcat−1 h−1). [Display omitted] •Au/TiO2 catalyst was prepared by a facile method and tested for CO-PROX reaction•Preformed Au nanoparticles with average sizes of ~ 4 nm were supported on TiO2•The catalyst showed to be very active and selective at low temperatures (20-50 °C)•Even at high volumetric O2/CO ratio and high hydrogen concentration in the flow stream
  • Editor: Elsevier B.V
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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