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

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In situ DRIFTS-MS studies on the oxidation of adsorbed NH3 by NOx over a Cu-SSZ-13 zeolite

Cited 22 times inthomson ciCited 15 times inthomson ci
Title
In situ DRIFTS-MS studies on the oxidation of adsorbed NH3 by NOx over a Cu-SSZ-13 zeolite
Author
Zhu, HaiyangKwak, JahunPeden, Charles H. F.Szanyi, Janos
Keywords
Cu-SSZ-13; In situ DRIFTS; NH3 SCR of NOx; Oxidant composition
Issue Date
2013
Publisher
ELSEVIER SCIENCE BV
Citation
CATALYSIS TODAY, v.205, no.30, pp.16 - 23
Abstract
DRIFT spectroscopy combined with mass spectrometry was used to investigate the oxidation of adsorbed ammonia by NO2, NO + O-2 and NO2 + O-2 on a copper ion exchanged SSZ-13 (Cu-SSZ-13) zeolite. Compared with both NO2 and NO, the adsorption of ammonia is much stronger on the Cu-SSZ-13 zeolite. Two adsorbed ammonia species were found over the Cu-SSZ-13 zeolite studied here, notably ammonia on Bronsted acid sites (proton) and ammonia on Lewis acid sites (copper ions). These adsorbed ammonia species present different activity profiles and selectivity to N-2 during NH3 oxidation. The results obtained suggest that ammonia adsorbed onto copper ions in Cu-SSZ-13 is more active at low temperatures than proton-adsorbed NH3, and give rise to a higher selectivity to N-2. The formation of N2O is associated primarily with the reaction of NOx with proton-adsorbed NH3 via the formation and subsequent thermal decomposition of NH4NO3. Published by Elsevier B.V.
URI
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DOI
http://dx.doi.org/10.1016/j.cattod.2012.08.043
ISSN
0920-5861
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