Catalysis Letters

, Volume 82, Issue 1–2, pp 131–139 | Cite as

Perturbed Angular Correlation Characterization of Indium Species on In/H-ZSM5 in the Presence of Water and Catalytic Deactivation Studies During the SCR of NOx with Methane

  • J.M. Ramallo-López
  • L.B. Gutierrez
  • A.G. Bibiloni
  • F.G. Requejo
  • E.E. Miró

Abstract

An In(4 wt%)-impregnated H-ZSM5 catalyst was characterized under wet and dry conditions by time-differential perturbed angular correlation (PAC) and by temperature-programmed reduction (TPR). Different indium species were quantified, correlating their structure with the catalyst deactivation due to the presence of water during the NO selective catalytic reduction (SCR) with methane. The fresh sample contains ∼60% of indium oxide and 40% of (InO)+ species at exchange sites, the latter being the active species for the reaction under study. Under wet atmosphere, hyperfine interactions determined by PAC indicate the formation of two types of In hydroxide species and the decrease of both (InO)+ and In2O3. TPR and PAC characterizations also show that deactivation is due to the decrease of (InO)+ at exchange sites to form, after water is removed, different non-active In oxide species.

environmental chemistry nitric oxide abatement In/H-ZSM5 PAC 

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Copyright information

© Plenum Publishing Corporation 2002

Authors and Affiliations

  • J.M. Ramallo-López
    • 1
  • L.B. Gutierrez
    • 2
  • A.G. Bibiloni
    • 1
  • F.G. Requejo
    • 1
  • E.E. Miró
    • 2
  1. 1.Dep. de Física, Fac. Ciencias ExactasInstituto de Física de La Plata (CONICET)La PlataArgentina
  2. 2.Fac. Ingeniería QuímicaInstituto de Investigaciones en Catálisis y Petroquímica, INCAPE (CONICET)Santa FeArgentina

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