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The origin of the decline in the photocatalytic activity of TiO2 in the decomposition of NO: TPD spectra of the adsorbed NO species

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In order to investigate the cause of the decline in the photocatalytic activity of TiO2 in the decomposition of NO in a flow reaction system, detailed TPD measurements of the photocatalysts were carried out after the photoreactions. It was found that the TPD peak assigned to the adsorbed NO species observed at around 524 K is directly associated with a decline in the photocatalytic activity. The TPD spectrum of the adsorbed NO species consisted of three different types of species. The γ-adsorbed species of NO, formed under UV irradiation on the active surface sites, was found to cause a remarkable decline in the photocatalytic activity of TiO2. It was also found that this decline could be recovered to its original activity by heat treatment with Ar and/or O2 at around 573 K.


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