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

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Non-thermal plasma-assisted NOx reduction over Na-Y zeolites: the promotional effect of acid sites

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Title
Non-thermal plasma-assisted NOx reduction over Na-Y zeolites: the promotional effect of acid sites
Author
Kwak, JahunPeden, Charles H.F.Szanyi, Janos
Keywords
non-thermal plasma-assisted catalytic NOx reduction; ammonium ion exchange; Na-Y zeolites; FTIR; TPD
Issue Date
2006-06
Publisher
SPRINGER
Citation
CATALYSIS LETTERS, v.109, no.1, pp.1 - 6
Abstract
The effect of acid sites on the catalytic activities of a series of H+-modified Na-Y zeolites was investigated in the non-thermal plasma assisted NOx reduction reaction using a simulated diesel engine exhaust gas mixture. The acid sites were formed by NH4+ ion exchange and subsequent heat treatment of a NaY zeolite. The catalytic activities of these H+-modified NaY zeolites significantly increased with the number of acid sites. This NOx conversion increase was correlated with the decrease in the amount of unreacted NO2. The increase in the number of acid sites did not change the NO level, it stayed constant. Temperature programmed desorption following NO2 adsorption showed the appearance of a high temperature desorption peak at 453 K in addition to the main desorption feature of 343 K observed for the base Na-Y. The results of both the IR and TPD experiments revealed the formation of crotonaldehyde, resulting from condensation reaction of adsorbed acetaldehyde. Strong adsorptions of both NOx and hydrocarbon species are proposed to be responsible for the higher catalytic activity of H+-modified Na-Y zeolites in comparison to the base NaY material.
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DOI
10.1007/s10562-006-0049-3
ISSN
1011-372X
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ECHE_Journal Papers
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