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Effect of the Pt oxidation state and Ce3+/Ce4+ ratio on the Pt/TiO2-CeO2 catalysts in the phenol degradation by catalytic wet air oxidation (CWAO)

Rocha, M.A. Lunagómez ; Del Ángel, G. ; Torres-Torres, G. ; Cervantes, A. ; Vázquez, A. ; Arrieta, A. ; Beltramini, J.N.

Catalysis today, 2015-07, Vol.250, p.145-154 [Periódico revisado por pares]

Elsevier B.V

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  • Título:
    Effect of the Pt oxidation state and Ce3+/Ce4+ ratio on the Pt/TiO2-CeO2 catalysts in the phenol degradation by catalytic wet air oxidation (CWAO)
  • Autor: Rocha, M.A. Lunagómez ; Del Ángel, G. ; Torres-Torres, G. ; Cervantes, A. ; Vázquez, A. ; Arrieta, A. ; Beltramini, J.N.
  • Assuntos: Ce3+/Ce4+ ratio ; CWAO ; Phenol degradation ; Pt oxidation state ; Pt/TiO2-Ce catalysts
  • É parte de: Catalysis today, 2015-07, Vol.250, p.145-154
  • Descrição: •Pt0/Pt2+ and Ce3+/Ce4+ ratio of 55/45 and 71/29 was found in the Pt/TiO2-Ce.•Pt/TiO2-Ce3% catalyst showed the highest phenol conversion and selectivity to CO2.•The Pt particle size was related to high activity in the catalysts. Pt/TiO2-Ce catalysts were synthesized with different concentrations of Ce at 1, 3, 5 and 10wt% for being used in catalytic wet air oxidation (CWAO) of aqueous solution of phenol (1000ppm). The supports were prepared by sol–gel and impregnated to 2.5wt% of Pt. The catalysts were characterized by different techniques: specific surface areas (BET), ICP-OES, XRD, pyridine-FTIR, X-ray photoelectron spectroscopy (XPS), CO-FTIR, TPO and transmission electron microscopy (TEM). Phenol oxidation was realized in a batch reactor at 160°C and 10bar of O2. Samples taken during the reaction course were analyzed using a total organic carbon analyzer (TOC) and gas chromatography (GC). The results showed that the specific surface areas of the Pt/TiO2-Ce catalysts increased with Ce content. By XPS it was found that a ratio of Pt0/Pt2+ and Ce3+/Ce4+ of 55%/45% and 71%/29% in Pt/TiO2-Ce3% catalyst showing the highest phenol conversion (96%) and selectivity to CO2 (100%). The Pt/TiO2-Ce3% and the Pt/TiO2-Ce5% catalysts presented the lowest Pt particle size, around 3.7–5.8nm leading to high activity (96% and 92% respectively). They displayed the high Lewis acid sites and good stability to deposits of carbonaceous species on the catalysts. The responsible of the good performance of these catalysts is related to the addition to CeO2 to TiO2 that produces an increase in the oxygen storage capacity (OSC) in these catalysts.
  • Editor: Elsevier B.V
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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