Journal
CHEMCATCHEM
Volume 12, Issue 6, Pages 1676-1690Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.201901813
Keywords
Iron hydroxyapatite; Catalyst preparation; Environmental chemistry; Denitrification; Mossbauer spectroscopy
Categories
Funding
- MOPGA Program
- SmartMatLab Project of Dipartimento di Chimica (Cariplo Foundation) [2013-1776]
Ask authors/readers for more resources
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 degrees 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 degrees C. Better performances have been observed on catalysts prepared by deposition-precipitation and impregnation (about 70 % of NOx conversion and selectivity to N-2 higher than 95 % at 350 degrees C), where alpha-Fe2O3 and 3D-Fe2O3 nanoclusters were present, as indicated by Mossbauer 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, N-2-physisorption, acidity by NH3 adsorption, and H-2-TPR) have concurred to elucidate Fe-sitting HAP and structure-activity relationships.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available