Liquid phase selective oxidation of benzene over nanostructured CuxCe1-xO2-delta (0.03 <= x <= 0.15)
Visualitza/Obre
Liquid.pdf (2,973Mb) (Accés restringit)
Sol·licita una còpia a l'autor
Què és aquest botó?
Aquest botó permet demanar una còpia d'un document restringit a l'autor. Es mostra quan:
- Disposem del correu electrònic de l'autor
- El document té una mida inferior a 20 Mb
- Es tracta d'un document d'accés restringit per decisió de l'autor o d'un document d'accés restringit per política de l'editorial
10.1016/j.molcata.2014.03.024
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/24439
Tipus de documentArticle
Data publicació2014-08-01
Condicions d'accésAccés restringit per política de l'editorial
Llevat que s'hi indiqui el contrari, els
continguts d'aquesta obra estan subjectes a la llicència de Creative Commons
:
Reconeixement-NoComercial-SenseObraDerivada 3.0 Espanya
Abstract
Liquid phase direct oxidation of benzene to phenol was carried out over copper loaded on oxides such as ceria, alumina, magnesia, ferric oxide, zinc oxide with 30% H2O2 as oxidant under atmospheric pressure. Of all the catalytic formulations prepared via a novel solution combustion synthesis, the ceria based catalysts showed highest activity. Particularly, over the Cu0.10Ce0.90O2_delta catalyst, 43% conversion of benzene with 100% selectivity was observed at 70 degrees C and atmospheric pressure. The activity of this combustion synthesized catalyst is also higher than the corresponding catalyst prepared by incipient wetness impregnation and coprecipitation methods. Powder XRD, TEM and XPS studies show ionically substituted copper over ceria as the predominant phase in the combustion derived catalyst whereas on the impregnated and coprecipitated catalysts copper is present in the dispersed copper oxide form. Influences of temperature and time, H2O2 concentration and solvent have also been investigated. Enhanced activity over the combustion synthesized catalyst wherein Cu2+ ion is present as substitutional ion in ceria has been attributed to Cu-O-Ce ionic interaction. Ionic substitution also brings stability to the active copper ion component in the combustion synthesized catalyst with lower risk of Cu-leaching as compared to the corresponding impregnated and coprecipitated catalysts as evidenced from the recycling experiments. (C) 2014 Elsevier B.V. All rights reserved.
CitacióMistri, R. [et al.]. Liquid phase selective oxidation of benzene over nanostructured CuxCe1-xO2-delta (0.03 <= x <= 0.15). "Journal of molecular catalysis A. Chemical", 01 Agost 2014, vol. 390, p. 187-197.
ISSN1381-1169
Versió de l'editorhttp://www.sciencedirect.com/science/article/pii/S138111691400123X
Fitxers | Descripció | Mida | Format | Visualitza |
---|---|---|---|---|
Liquid.pdf | 2,973Mb | Accés restringit |