Simultaneous NOx and Particulate Matter Removal from Diesel Exhaust by Hierarchical Fe-Doped Ce–Zr Oxide | Zendy

Ying Cheng | Zendy; Weiyu Song | Zendy; Jian Liu | Zendy; Huiling Zheng | Zendy; Zhen Zhao | Zendy; Chunming Xu | Zendy; Yuechang Wei | Zendy; Emiel J. M. Hensen | Zendy

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Simultaneous NO_x and Particulate Matter Removal from Diesel Exhaust by Hierarchical Fe-Doped Ce–Zr Oxide

Author(s) -

Ying Cheng,

Weiyu Song,

Jian Liu,

Huiling Zheng,

Zhen Zhao,

Chunming Xu,

Yuechang Wei,

Emiel J. M. Hensen

Publication year - 2017

Publication title -

acs catalysis

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 4.898

H-Index - 198

ISSN - 2155-5435

DOI - 10.1021/acscatal.6b03387

Subject(s) - soot , diesel exhaust , particulates , oxide , adsorption , materials science , doping , catalysis , inorganic chemistry , chemical engineering , diesel fuel , diesel particulate filter , chemistry , combustion , organic chemistry , metallurgy , optoelectronics , engineering

Particulate matter and NO x 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 NO x 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 N 2 . A mechanism for the reduction of NO with NH 3 on Fe-doped ceria is proposed involving adsorbed O 2 . Such adsorbed O 2 species will also contribute to the oxidation of soot.

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