NOx Trap Catalysts and Technologies: Fundamentals and Industrial Applications
Chapter 12: LNT Catalysts for the Simultaneous Removal of NOx and Soot: The DPNR Concept
Published:13 Jun 2018
Special Collection: 2018 ebook collection , ECCC Environmental eBooks 1968-2022Series: Catalysis Series
Roberto Matarrese, Lidia Castoldi, Marina Cortés-Reyes, Luis J. Alemany, Luca Lietti, 2018. "LNT Catalysts for the Simultaneous Removal of NOx and Soot: The DPNR Concept", NOx Trap Catalysts and Technologies: Fundamentals and Industrial Applications, Luca Lietti, Lidia Castoldi
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This chapter refers to the DPNR (Diesel Particulate–NOx Reduction) technology which aims at the simultaneous removal of soot and NOx from diesel exhausts by coupling the LNT technology for NOx reduction with the combustion of soot over the same LNT catalysts. First, the behavior of conventional Pt-based LNT catalyst in the soot combustion is analyzed. Then, the capability of Pt-based LNT catalysts to accomplish the removal of NOx in the presence of soot under cycling conditions (i.e. alternating lean–rich phases according to the typical DPNR strategy) is addressed. Particular emphasis is given to the specific role of each catalyst component and on the complex interaction between the de-NOx and de-soot functions. Finally, the potentialities of novel Pt-free DPNR formulations as well as alternative catalytic approaches are considered.