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The impact of photon flux, humidity and residence time using TiO 2 P25 and of the surface area of a series of CristalActiv PC TiO 2 anatase, on the selectivities of products formed in the continuous photocatalytic degradation of gaseous acetic acid (AA) on the scale of a few hundred ppm, in the presence or absence of O 2, was investigated. Under a continuous flow of air HCHO and C 2 H 6 were the most important products detected. CH 3 OH was also formed but to a lesser extent. Under a continuous flow of N 2 , the formation of these three products decreases whereas CH 3 OCH 3 , an interesting product which can be used as alternative fuel and CH 4 , is yielded. The impact of the experimental conditions on product formation, taking into account the intermediate formation of H 2 O 2 and the favorable impact of the surface area on the formation of CH 4 in the absence of oxygen and its opposite effect on the formation of C 2 H 6 in the presence of air, was discussed.The presence of rutile phase in TiO 2 P25 was also highlighted.

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