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Kwak, Ja Hun
Molecular Catalysis lab
Research Interests
  • Heterogeneous catalysis, molecular catalysis, ASlumima, zeolites

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Characterization of NOx species in dehydrated and hydrated Na- and Ba-Y FAU zeolites formed in NO2 adsorption

Cited 11 times inthomson ciCited 16 times inthomson ci
Title
Characterization of NOx species in dehydrated and hydrated Na- and Ba-Y FAU zeolites formed in NO2 adsorption
Other Titles
Characterization of NOx species in dehydrated and hydrated Na- and Ba-Y FAU zeolites formed in NO2 adsorption
Author
Szanyi, JKwak, JahunBurton, SRodriguez, JAPeden, CHF
Keywords
NOx reduction; adsorbed ionic NOx species; FT-IR; XANES; NMR
Issue Date
2006-02
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA, v.150, no.2-3, pp.164 - 170
Abstract
Adsorbed ionic NO2 species formed upon the interaction of NO2 with dehydrated or hydrated Na- and Ba-Y, FAU zeolites were characterized using FT-IR/TPD, solid state NMR, and XANES techniques. NO2 disproportionates on both dehydrated catalyst materials forming NO+ and NO3- species. These ionic species are stabilized by their interactions with the negatively charged zeolite framework and the charge compensating cations (Ne+ and Ba2+), respectively. Although the nature of the adsorbed NOx species formed on the two catalysts is similar, their thermal stabilities are strongly dependent on the charge compensating cations. In the presence of water in the channels of these zeolite materials new paths open for reactions between NO+ and H2O, and NO2 and H2O, resulting in significant changes in the adsorbed ionic species observed. These combined spectroscopic investigations afforded the understanding of the interactions between water and NO2 on these zeolite catalysts. (c) 2005 Elsevier B.V. All rights reserved
URI
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DOI
10.1016/j.elspec.2005.05.007
ISSN
0368-2048
Appears in Collections:
ECHE_Journal Papers
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