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)

Lunagomez Rocha, M. A., Del Angel, G., Torres-Torres, G., Cervantes, A., Vazquez, A., Arrieta, A. and Beltramini, J. N. (2015) 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). Catalysis Today, 250 145-154. doi:10.1016/j.cattod.2014.09.016


Author Lunagomez Rocha, M. A.
Del Angel, G.
Torres-Torres, G.
Cervantes, A.
Vazquez, A.
Arrieta, A.
Beltramini, J. N.
Title 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)
Formatted title
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)
Journal name Catalysis Today   Check publisher's open access policy
ISSN 0920-5861
1873-4308
Publication date 2015-07-15
Sub-type Article (original research)
DOI 10.1016/j.cattod.2014.09.016
Open Access Status Not Open Access
Volume 250
Start page 145
End page 154
Total pages 10
Place of publication Amsterdam, The Netherlands
Publisher Elsevier
Language eng
Subject 1503 Catalysis
1600 Chemistry
Abstract Pt/TiO-Ce catalysts were synthesized with different concentrations of Ce at 1, 3, 5 and 10 wt% for being used in catalytic wet air oxidation (CWAO) of aqueous solution of phenol (1000 ppm). The supports were prepared by sol-gel and impregnated to 2.5 wt% 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 10 bar of O. 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/TiO-Ce catalysts increased with Ce content. By XPS it was found that a ratio of Pt/Pt and Ce/Ce of 55%/45% and 71%/29% in Pt/TiO-Ce3% catalyst showing the highest phenol conversion (96%) and selectivity to CO (100%). The Pt/TiO-Ce3% and the Pt/TiO-Ce5% catalysts presented the lowest Pt particle size, around 3.7-5.8 nm 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 CeO to TiO that produces an increase in the oxygen storage capacity (OSC) in these catalysts.
Formatted abstract
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.
Keyword Ce3+/Ce4+ ratio
CWAO
Phenol degradation
Pt oxidation state
Pt/TiO2-Ce catalysts
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2016 Collection
School of Engineering Publications
Australian Institute for Bioengineering and Nanotechnology Publications
 
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