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Photoassisted nitrogen oxide (NO x ) storage was investigated over the barium-modified titanium dioxide (Ba/TiO 2 ) 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 –1 . The NO removal efficiency was kept >99% during the 1020 s interval from the start of the reaction over the Ba/TiO 2 photocatalyst. The temperature-programed desorption (TPD) measurement and X-ray diffraction (XRD) technique revealed that barium oxide (BaO) species functioned as a NO x storage material even at low temperatures, which result in improvement of the performance of the photoassisted NO x storage.
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Yamamoto et al. (2015) studied this question.
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