Carbon nanotube-supported metal catalysts for NOxreduction using hydrocarbon reductants. Part 1: Catalyst preparation, characterization and NOxreduction characteristics

Santillan-Jimenez, E, Miljkovic-Kocic, V, Crocker, M and Wilson, K 2011, 'Carbon nanotube-supported metal catalysts for NOxreduction using hydrocarbon reductants. Part 1: Catalyst preparation, characterization and NOxreduction characteristics', Applied Catalysis B: Environmental, vol. 102, no. 12, pp. 1-8.


Document type: Journal Article
Collection: Journal Articles

Title Carbon nanotube-supported metal catalysts for NOxreduction using hydrocarbon reductants. Part 1: Catalyst preparation, characterization and NOxreduction characteristics
Author(s) Santillan-Jimenez, E
Miljkovic-Kocic, V
Crocker, M
Wilson, K
Year 2011
Journal name Applied Catalysis B: Environmental
Volume number 102
Issue number 12
Start page 1
End page 8
Total pages 8
Publisher Elsevier BV
Abstract A dual catalyst system for the Selective Catalytic Reduction of NO x with hydrocarbons (HC-SCR), including distinct low and high temperature formulations, is proposed as a means to abate NO x emissions from diesel engines. Given that satisfactory high temperature HC-SCR catalysts are already available, this work focuses on the development of an improved low temperature formulation. Pt supported on multiwalled carbon nantubes (MWCNTs) was found to exhibit superior NO x reduction activity in comparison with Pt/Al 2 O 3 , while the MWCNT support displayed a higher resistance to oxidation than activated carbon. Refluxing the MWCNT support in a 1:1 mixture of H 2 SO 4 and HNO 3 prior to the metal deposition step proved to be beneficial for the metal dispersion and the NO x reduction performance of the resulting catalysts. This support effect is ascribed to the increased Brønsted acidity of the acid-treated MWCNTs, which in turn enhances the partial oxidation of the hydrocarbon reductant. Further improvements in the HC-SCR performance of MWCNT-based formulations were achieved using a 3:1 Pt-Rh alloy as the supported phase. © 2010 Elsevier B.V.
Subject Catalysis and Mechanisms of Reactions
Keyword(s) Alloys
Carbon nanotubes
Hydrocarbons
NO -Selective Catalytic Reduction x
Pt
Rh
DOI - identifier 10.1016/j.apcatb.2010.09.032
ISSN 0926-3373
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