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    First Phenol Carboxylation with CO2 on Carbon Nanostructured C@Fe-Al2O3 Hybrids in Aqueous Media under Mild Conditions

    Autor: 
    Calvo-Castañera, Feliciano
    ;
    Álvarez-Rodríguez, Jesús
    ;
    Candela, Nuria (1)
    ;
    Maroto-Valiente, Ángel
    Fecha: 
    01/2021
    Palabra clave: 
    carbon nanomaterials; alumina; hybrid; phenol conversion; CO2; JCR; Scopus
    Tipo de Ítem: 
    Articulo Revista Indexada
    URI: 
    https://reunir.unir.net/handle/123456789/11269
    DOI: 
    https://doi.org/10.3390/nano11010190
    Dirección web: 
    https://www.mdpi.com/2079-4991/11/1/190
    Open Access
    Resumen:
    Novel hybrid materials with integrated catalytic properties and hydrophobic response, C@Fe-Al2O3 hybrid samples, were presented and tested as catalysts for phenol reaction in aqueous solutions at atmospheric pressure and mild temperature conditions, using CO2 as a feedstock. A series of carbon-coated gamma-alumina pellets (C@Fe-Al2O3) were synthesized and characterized by TGA, Brunauer-Emmett-Teller (BET) method, Raman spectroscopy, SEM, TEM, and XPS in order to get comprehensive knowledge of their properties at the nanoscale and relate them with their catalytic behavior. The results obtained correlated their catalytic activities with their carbon surface compositions. The application of these materials as active catalysts in the Kolbe-Schmitt reaction for CO2 conversion in aqueous media was proposed as an alternative reaction for the valorization of exhausts industrial effluents. In these early tests, the highest conversion of phenol was observed for the hybrid samples with the highest graphitic characteristic and the most hydrophobic behavior. Carboxylation products such as benzoic acid, p-hydroxybenzoic acid, and salicylic acid, have been identified under these experimental conditions.
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