In this work, we present copper- or iron-loaded hydroxyapatite samples as active catalysts in the direct N2O decomposition reaction. Hydroxyapatite, functionalized with increasing amount of Cu(II) or Fe(III) species (from 3 to 9 wt%), were characterized by XRPD, DR UV-Vis, XPS, CO-adsorption followed by FT-IR, TEM-EDS, and tested in the N2O decomposition. Stability tests (550 °C, 72 h), reusability, resistance to sulfur (50 ppm) and to alkali (ca. 1 wt% of K or Ba) completed the study of the catalyst performances. Copper catalysts showed superior performances than iron counterparts. The structural evolution of the metal species with loading plays a critical role in the catalytic behavior. In the case of Fe-catalysts, a gradual Fe-coverage of HAP surface resulted in an increasing trend in the activity. Conversely, for Cu-catalysts high activity and selectivity were associated with a moderate structuration of Cu(II) in the form of nanoparticles with size of around 1.6 nm.

How hydroxyapatite governs surface Cu(II) and Fe(III) structuring: effects in the N2O decomposition under highly oxidant atmosphere / M.G. Galloni, S. Campisi, A. Gervasini, S. Morandi, M. Manzoli. - In: APPLIED CATALYSIS A: GENERAL. - ISSN 0926-860X. - 655:(2023 Apr 05), pp. 119101.1-119101.15. [10.1016/j.apcata.2023.119101]

How hydroxyapatite governs surface Cu(II) and Fe(III) structuring: effects in the N2O decomposition under highly oxidant atmosphere

M.G. Galloni
Primo
;
S. Campisi
;
A. Gervasini
;
S. Morandi
Penultimo
;
2023

Abstract

In this work, we present copper- or iron-loaded hydroxyapatite samples as active catalysts in the direct N2O decomposition reaction. Hydroxyapatite, functionalized with increasing amount of Cu(II) or Fe(III) species (from 3 to 9 wt%), were characterized by XRPD, DR UV-Vis, XPS, CO-adsorption followed by FT-IR, TEM-EDS, and tested in the N2O decomposition. Stability tests (550 °C, 72 h), reusability, resistance to sulfur (50 ppm) and to alkali (ca. 1 wt% of K or Ba) completed the study of the catalyst performances. Copper catalysts showed superior performances than iron counterparts. The structural evolution of the metal species with loading plays a critical role in the catalytic behavior. In the case of Fe-catalysts, a gradual Fe-coverage of HAP surface resulted in an increasing trend in the activity. Conversely, for Cu-catalysts high activity and selectivity were associated with a moderate structuration of Cu(II) in the form of nanoparticles with size of around 1.6 nm.
Catalyst stability; Copper; Iron; Sulfur poison, alkali poison; Surface characterization; Waste derived material;
Settore CHIM/04 - Chimica Industriale
Settore CHIM/02 - Chimica Fisica
Settore CHIM/03 - Chimica Generale e Inorganica
5-apr-2023
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/955915
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