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Bensouilah Rahma Olivet Lilian Hammedi Tijani Pronier Stéphane Barbier Jacques Fontaine Céline Ghorbel Abdelhamid Ksibi Zouhaier 《Research on Chemical Intermediates》2021,47(2):813-834
Research on Chemical Intermediates - Formaldehyde has been successfully converted into CO2 and H2O at low temperature in the presence of CeO2x–TiO2(100?x) mixed oxides prepared by the... 相似文献
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Mohamed Ksibi Elimam Elaloui Ammar Houas Noomen Moussa 《Applied Surface Science》2003,220(1-4):105-112
Physico-chemical analysis (X-ray, FTIR) and/or methanol oxidation reaction test were performed on fresh and deactivated vanadium catalysts used in H2SO4 manufacturing. It allowed the diagnosis of catalyst deactivation sources, as well as the processes of regenerating and recycling the worn out catalyst in converter. One of these processes is hydrometallurgical method. It consists in treating the deactivated catalyst with alkaline or acidic reagents and forming vanadate solution. A simple and non-costly operation of chemical attack permits the extraction of vanadium from silica in deactivated catalyst. The extracted vanadium can be used for the confection of regenerated catalysts or metallic tools. After optimization, this method can be used for industrial application. 相似文献
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Mohamed Triki Zouhaier Ksibi Abdelhamid Ghorbel Francisco Medina 《Journal of Sol-Gel Science and Technology》2011,59(1):1-6
Catalytic wet air oxidation of an aqueous solution of p-hydroxybenzoic acid was conducted over ruthenium catalysts (1 wt%)
supported on CeO2–Al2O3 aerogels mixed oxides at 140 °C and 50 bars of air. We study the effect of the amount of CeO2 in the catalyst. We found that the optimal cerium content in the Al2O3 support was 20 wt%. The activity of the Ru/Al2O3 and Ru/CeO2 was also tested for comparison. It was found that the addition of CeO2 on the alumina support improves the activity of Ru catalysts. The activity of the samples decreases in the following order:
Ru/Ce–Al (20) > Ru/Ce–Al (10) > Ru/Ce–Al (5) ≈ Ru/Al2O3 > Ru/CeO2. Samples characterization was performed by means of N2 adsorption–desorption, XRD, UV–Vis, TPR, SEM and TEM. 相似文献
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Ismail Rimeh Arfaoui Jihène Ksibi Zouhaier Ghorbel Abdelhamid Delahay Gérard 《Transition Metal Chemistry》2020,45(7):501-509
Transition Metal Chemistry - New mesoporous and well-structured Ag-based catalysts (xAg/ZrO2 and xAg/Fe–ZrO2 with x = 2 wt%) have been investigated in the total... 相似文献
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Mohamed Triki Doan Pham Minh Zouhaier Ksibi Abdelhamid Ghorbel Michèle Besson 《Journal of Sol-Gel Science and Technology》2008,48(3):344-349
The wet air oxidation of p-hydroxybenzoic acid, chosen as a model compound of olive mills wastewaters was carried out at 140 °C and 50 bar air over
Ru catalysts supported on TiO2 prepared by sol–gel method. These catalysts were characterized by means of N2 adsorption–desorption, XRD and TEM. Optimization of the catalytic performances was obtained by studying some parameters such
as the catalyst preparation method, the solvent evacuation way, the nature of the hydrolysis agent, the influence of the ruthenium
salt used as the metal precursor (Ru(NO)(NO3)3 or Ru(acac)3) and the catalyst pretreatment. The pre-calcination of the catalyst precursor at 300 °C under oxygen, before the reduction
step under hydrogen, was detrimental to the activity. The results showed that the use of nitric acid as hydrolysis agent,
drying under supercritical conditions and the use of Ru(NO)(NO3)3 leads to the more efficient catalyst with high TOC abatement. 相似文献
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A series of tungsten‐doped Titania photocatalysts were synthesized using a low‐temperature method. The effects of dopant concentration and annealing temperature on the phase transitions, crystallinity, electronic, optical, and photocatalytic properties of the resulting material were studied. The X‐ray patterns revealed that the doping delays the transition of anatase to rutile to a high temperature. A new phase WyTi1‐yO2 appeared for 5.00 wt% W‐TiO2 annealed at 900 °C. Raman and diffuse reflectance UV–Vis spectroscopy showed that band gap values decreased slightly up to 700 °C. X‐ray photoelectron spectroscopy showed that surface species viz. Ti3+, Ti4+, O2?, oxygen‐vacancies, and adsorbed OH groups vary depending on the preparation conditions. The photocatalytic activity was evaluated via the degradation of methylene blue using LED white light. The degradation rate was affected by the percentage of dopants. The best photocatalytic activity was achieved with the sample labeled 5.00 wt% W‐TiO2 annealed at 700 °C. 相似文献
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