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Preoxidized Au/TiO2 showed no initial activity during a first heating stage up to 70°C, while prereduction yielded a high initial CO conversion at room temperature. With FTIRS, two different CO absorption bands were detected. One band is usually attributed to CO on an oxidic gold species (2151 cm-1), the other one is characteristic of CO on metallic gold (2112 cm-1). The presence of the first species...
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