title: Transition metals-incorporated zeolites as environmental catalysts for indoor air ozone decomposition.
abstract: The present study aimed to prepare catalysts of Fe- and Cu-loaded zeolite via ion-exchange technique using dilute solutions of metal nitrate precursors followed by calcination at 600°C in the air for 4 h. Commercial zeolite ZSM-5 with specific surface area of 400 m2/g and diameter particle of 1.2-2 mm was used as a parent support. The prepared catalysts were characterized by Fourier transform infrared spectroscopy analysis. The IR absorbed bands of Cu-ZSM-5 and Fe-ZSM-5 revealed a shift in the frequency and a reduction in the intensity framework. This indicates that both catalysts have a significant change in the number of the zeolite structure bonds. The catalytic activity of the prepared materials compared to the parent zeolite was evaluated for the catalytic ozone decomposition. The ozone stream of the initial concentration (13 g/m3) with air flow rate (Q) of 0.18 m3/h was passed through a glass jacket column reactor filled with a fixed bed of 40 g zeolites. It was showed that the ozone removal efficiency by Cu-ZSM-5 and Fe-ZSM-5 was obviously higher than that found with the parent ZSM-5. In terms of O3removal efficiency, zeolite samples could be ranked as follows: Fe-ZSM-5 > Cu-ZSM-5> parent ZSM-5. The results revealed about 90% O3removal efficiency for Fe-ZSM-5 and 70% for Cu-ZSM-5 as compared to nearly 40% for the parent zeolite. Consequently, the incorporation of Fe and Cu metals onto the zeolite surface plays a key role for enhancing the gaseous ozone elimination.
authors.affiliation: a Air Pollution Department, Division of Environmental Research , National Research Centre , Giza , Egypt.
authors.forename: E F
authors.initials: EF
authors.lastname: Mohamed
authors.affiliation: b Chemistry of Natural and Microbial Products Department, Division of Pharmaceutical Industries , National Research Centre , Giza , Egypt.
authors.forename: G
authors.initials: G
authors.lastname: Awad
authors.affiliation: c Laboratoire de Chimie de la Matière Condensée, Faculté des Sciences et Techniques , Université Sidi Mohamed Ben Abdellah , Fès , Maroc.
authors.forename: H
authors.initials: H
authors.lastname: Zaitan
authors.affiliation: d Université de Toulouse, INPT, UPS, Laboratoire de Génie Chimique, 4 , Toulouse , France.
authors.forename: C
authors.initials: C
authors.lastname: Andriantsiferana
authors.affiliation: d Université de Toulouse, INPT, UPS, Laboratoire de Génie Chimique, 4 , Toulouse , France.
authors.forename: M-H
authors.initials: MH
authors.lastname: Manero
mesh_terms: D016902:Air Pollution, Indoor; D002384:Catalysis; D008670:Metals; D010126:Ozone / Q000737:chemistry*; D017641:Zeolites
chemical_list: D008670:Metals; D017641:Zeolites; D010126:Ozone
keywords: Zeolite ZSM-5; catalysts; indoor air; ion exchange; ozone decomposition; transition metals