V2O5/TiO2 and V2O5/TiO2–SO42− catalysts for the total oxidation of chlorobenzene: one-step sol–gel preparation vs. two-step impregnation
| Autor: | Romain Delaigle, Abdelhamid Ghorbel, Chiraz Gannoun, Eric M. Gaigneaux |
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| Přispěvatelé: | UCL - SST/IMCN/MOST - Molecules, Solids and Reactivity |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
inorganic chemicals
Materials science 010405 organic chemistry Vanadium chemistry.chemical_element Aerogel 010402 general chemistry 01 natural sciences Catalysis 0104 chemical sciences symbols.namesake chemistry.chemical_compound chemistry X-ray photoelectron spectroscopy Chlorobenzene symbols Sulfate Raman spectroscopy Sol-gel Nuclear chemistry |
| Zdroj: | Catalysis Science & Technology, Vol. 9, p. 2344-2350 (2019) |
| Popis: | This paper examines the effect of the preparation method of sulfated and unsulfated V2O5/TiO2 catalysts on chlorobenzene total oxidation. In particular, the method of incorporation of vanadium, either by impregnation or by direct introduction of V during the preparation of TiO2 or TiO2–SO42− aerogel supports, is discussed. The obtained catalysts have been characterized by means of ICP-AES, N2 adsorption–desorption at 77 K, XRD, Raman spectroscopy, DRIFTS, XPS, H2-TPR and NH3-TPD. Without sulfate, the impregnated catalyst exhibits a higher V dispersion and performs better than the sol–gel catalyst. The beneficial effect of sulfate groups is clearly demonstrated as both the impregnated and one-pot sol–gel samples with sulfate markedly outperform the corresponding samples without sulfate. The sulfated one-pot sol–gel catalyst exhibits the best performance at high temperature, probably thanks to its sulfate-rich surface. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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