Figure 7.
DRIFT spectra of WO3 powder at 100 °C. The powders were exposed to 1 ppm of NO2 in air for (a) 2 min, (b) 20 min, and (c) 50 min. After NO2 exposure, the powders were purged by air for (d) 1 min, (e) 30 min, and (f) 60 min.
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