Simultaneous NOx and particulate matter removal from diesel exhaust by hierarchical Fe-doped Ce-Zr-oxide

Y. Cheng, W. Song, J. Liu, H. Zheng, Z. Zhao, C. Xu, Y. Wei, E.J.M. Hensen

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

34 Citaten (Scopus)
171 Downloads (Pure)

Samenvatting

Particulate matter and NOx emissions from diesel exhaust remains one of the most pressing environmental problems. We explore the use of hierarchically ordered mixed Fe–Ce–Zr oxides for the simultaneous capture and oxidation of soot and reduction of NOx by ammonia in a single step. The optimized material can effectively trap the model soot particles in its open macroporous structure and oxidize the soot below 400 °C while completely removing NO in the 285–420 °C range. Surface characterization and DFT calculations emphasize the defective nature of Fe-doped ceria. The isolated Fe ions and associated oxygen vacancies catalyze facile NO reduction to N2. A mechanism for the reduction of NO with NH3 on Fe-doped ceria is proposed involving adsorbed O2. Such adsorbed O2 species will also contribute to the oxidation of soot.
Originele taal-2Engels
Pagina's (van-tot)3883–3892
TijdschriftACS Catalysis
Volume7
Nummer van het tijdschrift6
DOI's
StatusGepubliceerd - 2017

    Vingerafdruk

Citeer dit