Iron-functionalized hydroxyapatite (Fe/HAP, 2 < Fe wt% < 7) was prepared by ionic exchange and tested in the NOx reduction by ammonia (NH3-SCR). Iron dispersion, structure and acidity of the samples were investigated by UV–vis-DR spectroscopy, XRPD and ammonia titration. On Fe/HAP catalysts, NOx conversion started at higher temperatures and was always lower than on the reference Cu/HAP catalysts. Selectivity to N2 was remarkable (> 95%) up to the attainment of maximum NOx conversion; for higher temperatures, selectivity declined due to the formation of N2O from NH3 over-oxidation. TPR-TPO cycles allowed to relate the redox properties of samples with their catalytic performances

Comparative performance of copper and iron functionalized hydroxyapatite catalysts in NH3-SCR / S. Campisi, M.G. Galloni, F. Bossola, A. Gervasini. - In: CATALYSIS COMMUNICATIONS. - ISSN 1566-7367. - 123(2019 Apr), pp. 79-85.

Comparative performance of copper and iron functionalized hydroxyapatite catalysts in NH3-SCR

Campisi, Sebastuiano;GALLONI, MELISSA GRETA;Gervasini Antonella
2019-04

Abstract

Iron-functionalized hydroxyapatite (Fe/HAP, 2 < Fe wt% < 7) was prepared by ionic exchange and tested in the NOx reduction by ammonia (NH3-SCR). Iron dispersion, structure and acidity of the samples were investigated by UV–vis-DR spectroscopy, XRPD and ammonia titration. On Fe/HAP catalysts, NOx conversion started at higher temperatures and was always lower than on the reference Cu/HAP catalysts. Selectivity to N2 was remarkable (> 95%) up to the attainment of maximum NOx conversion; for higher temperatures, selectivity declined due to the formation of N2O from NH3 over-oxidation. TPR-TPO cycles allowed to relate the redox properties of samples with their catalytic performances
Hydroxyapatite; Iron functionalized hydroxyapatite; NH3-SCR catalysts
Settore CHIM/02 - Chimica Fisica
CATALYSIS COMMUNICATIONS
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/625778
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