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Three-dimensionally ordered macroporous PrOx: An improved alternative to ceria catalysts for soot combustion.

Authors :
Alcalde-Santiago, Virginia
Bailón-García, Esther
Davó-Quiñonero, Arantxa
Lozano-Castelló, Dolores
Bueno-López, Agustín
Source :
Applied Catalysis B: Environmental. Jul2019, Vol. 248, p567-572. 6p.
Publication Year :
2019

Abstract

Graphical abstract A novel three dimensionally ordered macroporous PrO x catalyst, which outperforms the activity of Ceria, has been prepared and tested for soot combustion. This novel catalyst combines high active oxygen production with enhanced transfer of such active oxygen to soot due to the improved solid-solid soot-catalyst contact. Highlights • A novel three dimensionally ordered macroporous (3DOM) PrOx catalyst was prepared. • The soot combustion activity of 3DOM PrO x was compared with 3DOM Ceria and conventional (Ref) catalyst. • 3DOM PrOx is more active for soot combustion than 3DOM ceria. • PrOx is more easily reducible than CeO 2 and 3DOM structure favours that reducibility. • PrOx presents higher ability to oxidize NO to NO 2 than CeO 2 improving the activity. Abstract The synthesis and use for soot combustion of praseodymium oxide with three-dimensionally ordered macroporous (3DOM) structure is described. This novel PrO x -3DOM catalyst is presented as an improved noble-metal-free alternative to CeO 2 as soot combustion catalyst. The PrO x -3DOM catalyst presents a defined 3DOM structure with high macropores volume, which significantly enhances the solid-solid soot-catalyst contact. This enhanced contact, together with the improved reducibility of PrO x regarding CeO 2 , ameliorate the active oxygen production and its transfer to soot particles, improving the soot combustion with O 2. In addition, the higher ability of PrO x to oxidize NO to NO 2 , improves the soot combustion in a higher extent than CeO 2 in presence of NO x. The catalytic activity of PrO x -3DOM after several soot combustion cycles is also confirmed. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
09263373
Volume :
248
Database :
Academic Search Index
Journal :
Applied Catalysis B: Environmental
Publication Type :
Academic Journal
Accession number :
135136763
Full Text :
https://doi.org/10.1016/j.apcatb.2018.10.049