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

[Display omitted] A novel three dimensionally ordered macroporous PrOx 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 impro...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2019-07, Vol.248, p.567-572
Main Authors: Alcalde-Santiago, Virginia, Bailón-García, Esther, Davó-Quiñonero, Arantxa, Lozano-Castelló, Dolores, Bueno-López, Agustín
Format: Article
Language:English
Subjects:
3DOM
Catalysis
Catalysts
Catalytic activity
Ceria
Cerium oxides
Chemical synthesis
Combustion
Nitrogen dioxide
Nitrogen oxides
Noble metals
NOx
Oxygen production
Praseodymia
Praseodymium
Praseodymium oxide
Soot
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Summary:[Display omitted] A novel three dimensionally ordered macroporous PrOx 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. •A novel three dimensionally ordered macroporous (3DOM) PrOx catalyst was prepared.•The soot combustion activity of 3DOM PrOx 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 CeO2 and 3DOM structure favours that reducibility.•PrOx presents higher ability to oxidize NO to NO2 than CeO2 improving the activity. The synthesis and use for soot combustion of praseodymium oxide with three-dimensionally ordered macroporous (3DOM) structure is described. This novel PrOx-3DOM catalyst is presented as an improved noble-metal-free alternative to CeO2 as soot combustion catalyst. The PrOx-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 PrOx regarding CeO2, ameliorate the active oxygen production and its transfer to soot particles, improving the soot combustion with O2. In addition, the higher ability of PrOx to oxidize NO to NO2, improves the soot combustion in a higher extent than CeO2 in presence of NOx. The catalytic activity of PrOx-3DOM after several soot combustion cycles is also confirmed.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2018.10.049