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Träfflista för sökning "WFRF:(Chen Lu) srt2:(1995-1999)"

Search: WFRF:(Chen Lu) > (1995-1999)

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1.
  • Chen, Wenhua, et al. (author)
  • Reduction of NO by C4 hydrocarbons on platinum in the presence of oxygen : influence of sulfur dioxide
  • 1997
  • In: Journal of Catalysis. - : Elsevier BV. - 0021-9517 .- 1090-2694. ; 172:1, s. 3-12
  • Journal article (peer-reviewed)abstract
    • The reduction of NO, in the presence of i-C4H10or i-C4H8and O2, catalyzed by a platinum foil, was studied in order to understand better the catalytic activity of platinum metal, free of any support or dispersion effects. The reaction products were analyzed by mass spectrometry, and the surface was characterized by X-ray photoelectron spectroscopy at different stages of the reaction. A correlation between the catalytic activity for NO conversion and the presence of adsorbed intermediates is demonstrated. The role of oxygen is interpreted as twofold: formation of active intermediates and deactivation of the surface. The effect of traces of sulfur dioxide in the reacting phase on the reduction of NO by isobutene was investigated. The influence of SO2is very much dependent upon its initial concentration in the gas phase. Low concentrations (<15 ppm) promote the reduction of NO, whereas higher levels poison the reaction by a surface site blocking effect.
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2.
  • Pradier, C.M., et al. (author)
  • NO reduction by isobutene, in the presence of oxygen, on platinum and copper : a comparative study
  • 1996
  • In: Catalysis Today. - : Elsevier BV. - 0920-5861 .- 1873-4308. ; 29:1-4, s. 59-65
  • Journal article (peer-reviewed)abstract
    • The reaction of NO, oxygen and isobutene was studied under conditions close to stoichiometric, on a platinum and on a copper disk in order to better understand the role of each metal, free of any support and dispersion effects. The products of the reaction were analysed by mass spectrometry and an XPS characterization of the surface was carried out at different stages of the reaction. A correlation between the catalytic activity for NO conversion and the presence of adsorbed intermediates has been clearly demonstrated on platinum. On copper, a redox cycle of the metal is necessary to activate the catalyst. On platinum, oxygen is necessary to initiate the reaction, clean the surface and form reactive intermediates; the reaction is strongly sensitive to oxygen concentration, whereas on copper, oxygen does not directly participate in the reaction mechanism.
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  • Result 1-3 of 3

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