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

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The catalytic chemistry of HCN+NO2 over na- and Ba-Y,FAU: An in situ FTIR and TPD/TPR study

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Title
The catalytic chemistry of HCN+NO2 over na- and Ba-Y,FAU: An in situ FTIR and TPD/TPR study
Author
Szanyi, JánosKwak, JahunPeden, Charles H. F.
Keywords
NOX REDUCTION; HYDROGEN-CYANIDE; CU/ZSM-5 CATALYSTS; FAU ZEOLITES; ADSORPTION; HYDROCARBONS
Issue Date
2005-02
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF PHYSICAL CHEMISTRY B, v.109, no.4, pp.1481 - 1490
Abstract
The adsorption of HCN and the reaction of HCN with NO2 over Na-, and Ba-Y,FAU zeolite catalysts were investigated using in situ FTIR and TPD/TPR spectroscopies. Both catalysts adsorb HCN molecularly at room temperature, and the strength of adsorption is higher over Ba-Y than Na-Y. Over Na-Y, the reaction between HCN and NO, is slow at 473 K. On Ba-Y, HCN reacts readily with NO2 at 473K, forming N-2, CO, CO2, HNCO, NO, N2O, and C2N2. The results of this investigation suggest that initial step in the HCN + NO2 reaction over these catalysts is the hydrogen abstraction from HCN, and the formation of ionic CN- and NC- species. The formation of N2 can proceed directly from these ionic species upon their interaction with NO+. Alternatively, these cyanide species can be oxidized to isocyanates which then can be further transformed to N-2, N2O and COx in their Subsequent reaction with NOx
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DOI
10.1021/jp045671o
ISSN
1520-6106
Appears in Collections:
ECHE_Journal Papers
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