Preparation and characterization of CeO2–TiO2 support for Ru catalysts: Application in CWAO of p-hydroxybenzoic acid

Triki, M.; Ksibi, Zouhaier; Ghorbel, Abdelhamid; Medina, Francisco

doi:10.1016/j.micromeso.2008.07.019

Cited by 22 publications

(16 citation statements)

References 20 publications

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“…6 Correlation between the activity of the different supported Ru-containing catalysts and changes in specific surface area be observed between the enhancement of the textural properties of the TiO 2 -based support and the CWAO activity. A similar correlation between the activity and the increase of specific surface areas was previously observed for Ru/CeO 2 -TiO 2 catalysts [8]. The essential step in the CWAO reaction is related to the oxygen supply to the active catalytic sites.…”

Section: Catalytic Testssupporting

confidence: 82%

“…These Ru/titanate catalysts have then been evaluated in the CWAO of p-hydroxybenzoic acid and compared to previous results acquired on Ru/TiO 2 aerogel (Ru/A) and Ru/TiO 2 DT51 (Ru/DT51). The preparation of these former catalysts can be found elsewhere [6,8].…”

Section: Preparation Of the Ru/titanate Catalystsmentioning

confidence: 99%

“…(14) 1000 Nanowire a From Ref. [8]; hDpi average pore diameter; b size crystal of the support. The data in brackets are the textural properties of the TiO 2 supports before impregnation UV-vis diffuse reflectance spectra of the HNT and HNW supports and of their respective supported Ru catalysts are presented in Fig.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

“…Increasing the surface area of the catalyst has been found recently to be an interesting alternative to enhance the adsorption of oxygen on the surface of the catalyst leading to a substantial gain in activity [8]. A favorable candidate for obtaining high surface area Ru catalysts on TiO 2 -based support is provided by hydrogenotitanate solids.…”

Section: Introductionmentioning

confidence: 99%

“…For this purpose, two different supports were used: hydrogenotitanate nanotubes (HNT) and hydrogenotitanate nanowires obtained through treatment of TiO 2 P25 with concentrated NaOH and KOH. Comparison was made with previously studied Ru catalysts supported onto conventional TiO 2 supports presenting lower surface areas: a commercial DT51 support (Thann & Mulhouse) and an anatase aerogel support obtained by sol-gel techniques [6,8].…”

Section: Introductionmentioning

confidence: 99%

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Highly active ruthenium catalysts supported on nanostructured titanates for application in catalytic wet air oxidation of p-hydroxybenzoic acid

Triki

Kochkar

Berhault

et al. 2010

Reac Kinet Mech Cat

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Ruthenium catalysts have been prepared by incipient wetness impregnation of ruthenium(III) nitrosylnitrate, Ru(NO)(NO 3 ) 3 onto high surface area titanate supports obtained by hydrothermal treatment of TiO 2 P25 in concentrated alkaline solutions. These Ru-containing catalysts were evaluated in the catalytic wet air oxidation of p-hydroxybenzoic acid (p-HBZ), a model compound representative of phenolic pollutants present in olive mills wastewaters, at 413 K and 50 bars of air. Two different titanates morphologies were tested as supports for this reaction: hydrogenotitanate nanotubes (HNT) obtained with concentrated NaOH and hydrogenotitanate nanowires (HNW) formed in the presence of highly concentrated KOH solution. The HNT and HNW supports and their corresponding supported Ru catalysts were characterized by means of N 2 adsorption-desorption, XRD, UV and TEM analyses. Results showed that the use of high surface area titanate supports led to catalysts much more active than similar Ru catalysts supported on conventional TiO 2 supports.

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Section: Catalytic Testssupporting

confidence: 82%

Section: Preparation Of the Ru/titanate Catalystsmentioning

confidence: 99%

Section: Catalyst Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Highly active ruthenium catalysts supported on nanostructured titanates for application in catalytic wet air oxidation of p-hydroxybenzoic acid

Triki

Kochkar

Berhault

et al. 2010

Reac Kinet Mech Cat

Self Cite

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Total degradation of p-hydroxybenzoic acid by Ru-catalysed wet air oxidation: a model for wastewater treatment

et al. 2015

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Catalytic wet air oxidation using heterogeneous catalysts is a promising technology for treatment of wastewaters. Wastewaters from olive oil mills are difficult to clean because effluents contain high levels of phenolic compounds that cannot be removed by biological treatment or incineration. Therefore, we tested the catalytic wet air oxidation of p-hydroxybenzoic acid, as model molecule of olive oil mills wastewaters, over Ru-supported CeO2–TiO2 mixed oxides. We focussed on the Ce/Ti molar ratio because this ratio modifies the properties of the Ru catalysts. Supports were prepared by using the sol–gel method. The Ru catalysts were prepared by impregnation. Those products were characterized by N2 adsorption–desorption, X-ray diffraction, H2 chemisorption, transmission electron microscopy and inductively coupled plasma. Catalytic wet air oxidation of p-hydroxybenzoic acid was performed in a batch reactor at 140 °C and 50 bar of air. Our results show that the most efficient catalyst was Ru with a Ce/Ti ratio of 1/5, which converted totally p-hydroxybenzoic after 7 h of reaction without Ru leaching. We explain this finding by an enhanced dispersion of Ru due to better structural properties of the CeO2–TiO2 support.© 2015, Springer International Publishing Switzerland.Postprint (author's final draft

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Preparation and characterization of CeO2–Al2O3 aerogels supported ruthenium for catalytic wet air oxidation of p-hydroxybenzoic acid

Triki

Ksibi

Ghorbel

et al. 2011

J Sol-Gel Sci Technol

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Preparation and characterization of CeO2–TiO2 support for Ru catalysts: Application in CWAO of p-hydroxybenzoic acid

Cited by 22 publications

References 20 publications

Highly active ruthenium catalysts supported on nanostructured titanates for application in catalytic wet air oxidation of p-hydroxybenzoic acid

Highly active ruthenium catalysts supported on nanostructured titanates for application in catalytic wet air oxidation of p-hydroxybenzoic acid

Total degradation of p-hydroxybenzoic acid by Ru-catalysed wet air oxidation: a model for wastewater treatment

Preparation and characterization of CeO2–Al2O3 aerogels supported ruthenium for catalytic wet air oxidation of p-hydroxybenzoic acid

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