Photocatalytic disappearance with

UV irradiation of the catalyst in the presence of N2O at 295 K led to the evolution of N2, its yield increasing with the irradiation time. Such an evolution indicates that the photocatalytic decomposition of N2O proceeds on the catalyst under UV irradiation at 295 K. On the other hand, UV irradiation of the catalyst in the presence of N2O at 77 K led to the appearance of an EPR signal attributed to N20 anion radicals. These are thermally stable at 77 K, decomposing when the temperature increases from 77 to 298 K with the evolution of N2 and the formation of the O species. The EPR signal arising from N2O disappeared immediately upon the addition of O2 at pressures of about 133-330 Pa at 77 K, while simultaneously the signal due to the O2 anion radicals appeared with no change observed in the overall spin concentration. These results indicate that O2 anion radicals are easily formed by an electron-transfer reaction between... 

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