Catalytic reduction of NO by CO over Cu/CexZr1- xO2 prepared by flame synthesis

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)210-219
Journal / PublicationJournal of Catalysis
Volume272
Issue number2
Publication statusPublished - 15 Jun 2010
Externally publishedYes

Abstract

Mixed oxides of 4% Cu/CexZr1-xO 2 (x = 0, 0.25, 0.50, 0.75, 1) were synthesized by flame spray pyrolysis and characterized by N2 adsorption, XRD, XPS, O 2-TPD and H2-TPR. The as-prepared catalysts were assessed for the equimolar reduction of NO by CO (3000 ppm each, space velocity 50,000 h-1). Incorporation of Zr4+ in the form of solid solution with CeO2 stabilizes the Cu+ species, which was in turn beneficial for the initial reductive chemisorption of NO to N2O. A peculiar low-temperature activity giving 40% N2 yield was found with the composition of Cu/Ce0.75Zr0.25O2 at 150 °C. This is traced to the low-temperature activation of rapid CO oxidation (as probed by in situ DRIFTS), related to the abundance of surface reactive lattice oxygen sites and their high reducibility. At 250 °C and above, a N2 yield of >85% (and ∼100% at 350 °C) was obtained for all Zr-containing catalysts i.e. Cu/CexZr1- xO2 (x <1.0), with essentially no intermediate N 2O detected in the exhaust gas stream. An organonitrogen mechanism is occurring in this case. © 2010 Elsevier Inc.

Research Area(s)

  • Ceria-zirconia, Copper, deNOx, DRIFTS, Flame spray pyrolysis, NO reduction

Citation Format(s)

Catalytic reduction of NO by CO over Cu/CexZr1- xO2 prepared by flame synthesis. / Zhang, Runduo; Teoh, Wey Yang; Amal, Rose et al.
In: Journal of Catalysis, Vol. 272, No. 2, 15.06.2010, p. 210-219.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review