Noble-Metal-Free
NO<sub><i>x</i></sub> Storage
over Ba-Modified TiO<sub>2</sub> Photocatalysts under UV-Light Irradiation
at Low Temperatures
- Publication date
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Abstract
Photoassisted
nitrogen oxide (NO<sub><i>x</i></sub>)
storage was investigated over the barium-modified titanium dioxide
(Ba/TiO<sub>2</sub>) photocatalysts under UV-light irradiation at
a high concentration of nitrogen monoxide (NO) of 200 ppm and a high
gas hourly space velocity (GHSV) of 50 000 h<sup>–1</sup>. The NO removal efficiency was kept >99% during the 1020 s interval
from the start of the reaction over the Ba/TiO<sub>2</sub> photocatalyst.
The temperature-programed desorption (TPD) measurement and X-ray diffraction
(XRD) technique revealed that barium oxide (BaO) species functioned
as a NO<sub><i>x</i></sub> storage material even at low
temperatures, which result in improvement of the performance of the
photoassisted NO<sub><i>x</i></sub> storage