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Mohammad Hajaghazadeh,Vincenzo Vaiano,Diana Sannino,Hossein Kakooei,Rahmat Sotudeh-Gharebagh 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.4
The effect of operating parameters on gas phase photocatalytic oxidation of methyl ethyl ketone (MEK) hasbeen investigated over P25 and PC500 photocatalysts. The parameters were gas flow rate, relative humidity (RH), reactiontemperature, and ultraviolet intensity. The photoreactor was composed of two LEDs matrices and a fluidized bedreactor (LED-FBR). No mass transfer limitation phenomena occurred at flow rates in the range 30-70 NL/h. The oxidationof MEK over the two photocatalysts did not highly depend on the presence or absence of humidity in the airstream. Temperature was determined as an important parameter in conversion of MEK over 60 to 120 oC, influencingalso the selectivity to carbon dioxide and carbon monoxide. The simultaneous influence of RH and temperature wasobserved in the reaction at different temperatures and RHs, evidencing the decrease in the selectivity towards CO withincrease of RH. With the increase of ultraviolet intensity, the rate of MEK oxidation increased over both catalysts, withthe better activity of PC500 than P25 particularly at higher light intensities. The main effect of temperature was both topromote the MEK conversion and to limit the competitive water adsorption in the PCO reaction over the tested titanias.
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