NO₂ Adsorption on Ultrathin Θ-Al₂O₃ Films: Formation of Nitrite and Nitrate Species
Interaction of NOx with an ordered ?-Al?O?/NiAl(100) model catalyst surface was investigated using temperature programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS). The origin of the NOx uptake of the catalytic support (i.e. Al?O?) in a NOx storage catalyst is identified. Adsorbed NO? is converted to strongly bound nitrites and nitrates that are stable on the model catalyst surface at temperatures as high as 300 and 650 K, respectively. The results show that alumina is not completely inert and may stabilize some form of NOx under certain catalytic conditions. The stability of the NOx formed by exposing the ?-Al?O? model catalyst to NO? adsorption increases in the order: NO? (physisorbed or N?O?) < NO?(chemisorbed) < NO?- < NO?-.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 15020823
- Report Number(s):
- PNNL-SA-45049; 6695; KC0302010; TRN: US200521%%273
- Journal Information:
- Journal of Physical Chemistry, Vol. 109, Issue 33
- Country of Publication:
- United States
- Language:
- English
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