Article
New insight of the influence of acidic surface sites of zeolite on the ability to remove gaseous ozone using operando DRIFTS studies
Nuevo conocimiento de la influencia de los sitios de superficie ácida de la zeolita en la capacidad de eliminar el ozono gaseoso mediante estudios de operando DRIFTS
Registro en:
Microporous and Mesoporous Materials 294 (2020) 109912
1387-1811
Autor
Valdés, Héctor
Ulloa, Francisco J.
Solar, Víctor A.
Cepeda, Manuel S.
Azzolina Jury, Federico
Thibault Starzyk, Frédéric
Resumen
Recently, natural zeolites have started to be used as alternative materials for ozone abatement from working
environments. In this study, a surface response methodology based on a D-Optimal design is applied to develop a
transition-metal-modified natural zeolite that increases ozone removal efficiency. Ozone adsorption and/or
decomposition onto natural and cobalt modified natural zeolite were studied by diffuse reflectance infrared
Fourier transform spectroscopy (DRIFTS). Results evidenced that ozone is adsorbed and decomposed at strong
Lewis acidic sites, whereas ozone adsorption products interact with surface OH groups. Additionally, DRIFTS
studies indicate that nitrous species are adsorbed at acidic sites, reducing the capacity to decompose ozone when
ozone is generated from air.