Repositorio UFRO · Omeka S

Evidence of Synergy Effects between Zinc and Copper Oxides with Acidic Sites on Natural Zeolite during Photocatalytic Oxidation of Ethylene Using Operando DRIFTS Studies

Primer Autor	Abreu, Norberto J.
Co-autores	Valdes, Hector Zaror, Claudio A. de Oliveira, Tatianne Ferreira Azzolina-Jury, Federico Thibault-Starzyk, Frederic
Título	Evidence of Synergy Effects between Zinc and Copper Oxides with Acidic Sites on Natural Zeolite during Photocatalytic Oxidation of Ethylene Using Operando DRIFTS Studies
Editorial	MDPI
Revista	CATALYSTS
Lenguaje	en
Resumen	In this article, the role of surface sites of modified zeolites with semiconductor nanoparticles as alternative photocatalyts for protecting post-harvest foodstuff from the detrimental effects of ethylene is addressed. Two single and one double catalyst based on zinc and copper oxides supported over modified zeolite samples were prepared. Physical, chemical, and surface properties of prepared materials were studied by several characterization methods. UV-Vis absorption spectra show that the applied modification procedures increase the optical absorption of light in the UV and visible regions, suggesting that an increase in the photocatalytic activity could take place mainly in the obtained co-impregnated catalyst. An ethylene conversion around 50% was achieved when the parent natural zeolite support was modified with both transition metal oxides, obtaining higher removal efficiency in comparison to single oxide catalysts. Adsorption and photocatalytic oxidation experiments were also performed using single and double catalysts supported over fumed silica, attaining lower ethylene conversion and thus highlighting the role of zeolite surfaces as adsorption sites for ethylene during photocatalytic reactions. Operando diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) studies reveal that a synergistic mechanism occurs, involving ethylene adsorption at acidic sites of zeolite and its photocatalytic oxidation due to the generation of radicals by the light activation of nanoparticles of zinc and copper oxides.
Fecha Publicación	2023
Tipo de Recurso	artículo original
doi	10.3390/catal13030610
Formato Recurso	PDF
Palabras Claves	adsorption natural zeolite support single and double metal oxide catalysts photocatalysis synergistic mechanism
Ubicación del archivo	http://dx.doi.org/10.3390/catal13030610
Categoría OCDE	Química
Materias	adsorción soporte de zeolita natural catalizadores de óxido metálico simple y doble fotocatálisis mecanismo sinérgico
Identificador del recurso (Mandatado-único)	artículo original
Versión del recurso (Recomendado-único)	versión publicada
License	CC BY 4.0
Condición de la licencia (Recomendado-repetible)	CC BY 4.0
Derechos de acceso	acceso abierto
Access Rights	acceso abierto
Id de Web of Science	WOS:000957574900001
Tipo de ruta	verde# dorado
Categoría WOS	Química
Referencia del Financiador (Mandatado si es aplicable-repetible)	CONICYT-FONDECYT 1170694 ANID-FONDECYT 3210158 CONICYT-PCHA 21150082) ANID CONICYT-FONDECYT 1170694 ANID FONDECYT 3210158 ANID CONICYT-PCHA 21150082)