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

Santillan-Jimenez, Eduardo, Miljkovic-Kocic, Vladimir, Crocker, Mark and Wilson, Karen 2011. Carbon nanotube-supported metal catalysts for NOx reduction using hydrocarbon reductants. Part 1: Catalyst preparation, characterization and NOx reduction characteristics. Applied Catalysis B-Environmental 102 (1-2) , pp. 1-8. 10.1016/j.apcatb.2010.09.032

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Abstract

A dual catalyst system for the Selective Catalytic Reduction ofNOx with hydrocarbons (HC-SCR), including distinct low and high temperature formulations, is proposed as a means to abate NOx 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 NOx reduction activity in comparison with Pt/Al2O3, while the MWCNT support displayed a higher resistance to oxidation than activated carbon. Refluxing the MWCNT support in a 1:1 mixture of H2SO4 and HNO3 prior to the metal deposition step proved to be beneficial for the metal dispersion and the NOx 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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Cardiff Catalysis Institute (CCI)
Chemistry
Subjects: Q Science > QD Chemistry
Uncontrolled Keywords: NOx-Selective Catalytic Reduction ; Hydrocarbons ; Carbon nanotubes ; Pt ; Rh ; Alloys.
ISSN: 0926-3373
Last Modified: 19 Mar 2016 22:20
URI: http://orca-mwe.cf.ac.uk/id/eprint/12638

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