Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 248, Issue -, Pages 567-572Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2018.10.049
Keywords
Soot; Praseodymia; Ceria; 3DOM; NOx
Funding
- Spanish Ministry of Economy and Competitiveness [CTQ2015-67597-C2-2-R, FJCI-2015-23769]
- Spanish Ministry of Education, Culture and Sports [FPU14/01178]
- UE (FEDER funding)
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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 O-2. 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.
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