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

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NOx uptake on alkaline earth oxides (BaO, MgO, CaO and SrO) supported on gamma-Al2O3

Cited 16 times inthomson ciCited 17 times inthomson ci
Title
NOx uptake on alkaline earth oxides (BaO, MgO, CaO and SrO) supported on gamma-Al2O3
Other Titles
NOx uptake on alkaline earth oxides (BaO, MgO, CaO and SrO) supported on gamma-Al2O3
Author
Verrier, ChristelleKwak, JahunKim, Do HeuiPeden, Charles H. F.Szanyi, Janos
Keywords
NOx storage; basicity; BaO/gamma-Al2O3; MgO/gamma-Al2O3; SrO/gamma-Al2O3; CaO/gamma-Al2O3; NO2 TPD; FTIR; N-15 s.s. MAS NMR
Issue Date
2008-07
Publisher
ELSEVIER SCIENCE BV
Citation
CATALYSIS TODAY, v.136, no.1-2, pp.121 - 127
Abstract
NOx uptake experiments were performed on a series of alkaline earth oxide (AEO) (MgO, CaO, SrO, BaO) on gamma-alumina materials. Temperature programmed desorption (TPD) conducted in He flow revealed the presence of two kinds of nitrate species: i.e. bulk and surface nitrates. The ratio of these two types of nitrate species strongly depends on the nature of the alkaline earth oxide. The amount of bulk nitrate species increases with the basicity of the alkaline earth oxide. This conclusion was supported by the results of infrared and N-15 solid-state NMR studies of NO2 adsorption. Due to the low melting point of the precursor used for the preparation of MgO/gamma-Al2O3 material (Mg(NO3)(2)), a significant amount of Mg was lost during sample activation (high temperature annealing) resulting in a material with properties very similar to that of the gamma-Al2O3 support. The effect of water on the NOx species formed in the exposure of the AEO-s to NO2 was also investigated. In agreement with our previous findings for the BaO/gamma-Al2O3 system, an increase of the bulk nitrate species and the simultaneous decrease of the surface nitrate phase were observed for all of these materials. Published by Elsevier B.V
URI
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DOI
10.1016/j.cattod.2007.12.138
ISSN
0920-5861
Appears in Collections:
ECHE_Journal Papers
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