Supported Au catalysts for low-temperature abatement of propene and toluene, as model VOCs: Support effect

• Published in: Applied catalysis. B, Environmental Vol. 101; no. 3-4; pp. 629 - 637
• Main Authors: Ousmane, M., Liotta, L.F., Carlo, G.Di, Pantaleo, G., Venezia, A.M., Deganello, G., Retailleau, L., Boreave, A., Giroir-Fendler, A.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 14.01.2011; Elsevier
• Subjects: Aluminum oxide; Catalysis; Catalysts; Ce-doped Al2O3; CeO2; Chemical Sciences; Chemistry; Colloidal state and disperse state; Environment and Society; Environmental Sciences; Exact sciences and technology; General and physical chemistry; Gold; Mathematical models; Oxidation; Physical and chemical studies. Granulometry. Electrokinetic phenomena; Propene; Role of oxygen vacancies; Stability tests; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Titanium dioxide; Toluene; Toluene oxidation; X-ray photoelectron spectroscopy; Stability tests; Propene; Au; Ce-doped Al2O3; CeO2; Role of oxygen vacancies; Toluene oxidation; Binary compound; Support; Nanoparticle; X ray; Cerium oxide; Supported catalyst; O; Lanthanide compound; Precipitation; Photoelectron spectrometry; Oxidation; Deposition; Low temperature; Aluminium oxide; Gold; Oxygen; Stability; Hydrocarbon; Vacancy; Toluene; Transition element compounds; X ray diffraction; Ce0; Heterogeneous catalysis; Transmission electron microscopy; Ce-doped Al; Benzenic compound; Models; Titanium oxide; Alumina; Environmental protection
• ISSN: 0926-3373; 1873-3883
• DOI: 10.1016/j.apcatb.2010.11.004

Conversion (%) of (■) propene and (●) toluene versus temperature over Au/CeO2 catalyst. [Display omitted] ▶ Au/CeO2 is the best performing catalyst in the full oxidation of propene and toluene. ▶ Stable propene conversion was registered in a long-run over Au/CeO2 at 135̊C for 50h. ▶ The activity of Au/Al2O3 was highly improved by doping with CeO2 (7.5wt%). ▶ The oxygen vacancies present in the (7.5wt%) CeO2/Al2O3 stabilize gold nanoparticles. ▶ The interaction of gold nanoparticles with the support enhances the activity. In this work gold nanoparticles supported over ceria (Au/CeO2), titania (Au/TiO2), alumina (Au/Al2O3) and Ce doped alumina (Au/7.5Ce/Al2O3) were prepared by deposition–precipitation (DP) method with NaOH solution and characterized by BET, XRD, H2-TPR, TEM and XPS techniques. The catalytic activity was evaluated in the total oxidation of propene and toluene, chosen as model VOC molecules. The attention was focused on the catalyst stability. To this aim, three consecutive catalytic cycles in propene and toluene oxidation were performed for each catalyst. The activity trend was Au/CeO2>Au/7.5Ce/Al2O3>Au/TiO2>Au/Al2O3. Over Au/CeO2, the most active catalyst, a long-term propene oxidation test running for 50h, at low-temperature, 135°C was also carried out. Characterizations XRD and XPS were carried out on the spent catalyst after three catalytic runs in propene oxidation. The results were discussed in terms of structural, electronic, catalytic and reduction properties as a function of the nature of the support.