Functionalized Iron Hydroxyapatite as Eco‐friendly Catalyst for NH 3 ‐SCR Reaction: Activity and Role of Iron Speciation on the Surface

Autor:	Sergio Gustavo Marchetti, Aline Auroux, Georgeta Postole, M.G. Galloni, Sebastiano Campisi, Antonella Gervasini
Přispěvatelé:	Dipartimento di Chimica, Università degli Studi di Milano [Milano] (UNIMI), Centro de Investigación y Desarrollo en Ciencias Aplicadas [Buenos Aires] (CINDECA), Consejo Nacional de Investigaciones Científicas y Técnicas [Buenos Aires] (CONICET)-Universidad Nacional de la Plata [Argentine] (UNLP), IRCELYON-Approches thermodynamiques, analytiques et réactionnelles intégrées (ATARI), Institut de recherches sur la catalyse et l'environnement de Lyon (IRCELYON), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)
Rok vydání:	2020
Předmět:	Iron hydroxyapatite 010405 organic chemistry Organic Chemistry Ionic bonding [CHIM.CATA]Chemical Sciences/Catalysis 010402 general chemistry 01 natural sciences Catalysis 0104 chemical sciences Nanoclusters Catalyst preparation Inorganic Chemistry Ammonia chemistry.chemical_compound Adsorption chemistry Moessbauer spectroscopy Environmental chemistry Mössbauer spectroscopy Denitrification Physical and Theoretical Chemistry Selectivity NOx Nuclear chemistry
Zdroj:	ChemCatChem ChemCatChem, Wiley, 2020, 12 (6), pp.1676-1690. ⟨10.1002/cctc.201901813⟩
ISSN:	1867-3899 1867-3880
Popis:	SSCI-VIDE+ATARI:CARE+MGL:AAU:GPO; International audience; Eco‐friendly catalysts have been obtained by functionalizing hydroxyapatite (HAP) with iron (Fe/HAP), according to three preparative methods (flash ionic exchange, deposition‐precipitation, and impregnation). Fe/HAP samples (ca . 2–7 wt.% Fe) have been tested in the reaction of NOx reduction by ammonia (NH3‐SCR) in the 120–500 °C interval with different NH3/NO ratios (0.6–2) at fixed contact time (0.12 s). All Fe/HAP samples were active and selective in the NH3‐SCR reaction starting from ca . 350 °C. Better performances have been observed on catalysts prepared by deposition‐precipitation and impregnation (about 70 % of NOx conversion and selectivity to N2 higher than 95 % at 350 °C), where α‐Fe2O3 and 3D ‐Fe2O3 nanoclusters were present, as indicated by Mössbauer and UV‐Vis‐DR spectroscopies. On the opposite, paramagnetic Fe3+ centres were the predominant species on samples prepared by flash ionic exchange. Further characterization techniques (XRPD, N2‐physisorption, acidity by NH3 adsorption, and H2‐TPR) have concurred to elucidate Fe‐sitting HAP and structure‐activity relationships.
Databáze:	OpenAIRE
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