Degradation of toluene in a fluidized-bed photo-reactor using TiO2 coated active carbons

• Main Authors: Chun-De Wu, 吳俊德
• Other Authors: Hsiu-Po Kuo
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/95417507942024090419

碩士 === 長庚大學 === 化工與材料工程研究所 === 95 === The performance of TiO2 coated active carbon, AC/TiO2, for the degradation of toluene in a gas fluidized bed photo-reactor was studied. The experimental condition controlled the inlet concentration 250~1000ppm of toluene in the gas phase, the relative humidity 15~65% of the inlet stream and the gas flow rate 5、10 and 15 L/min on the conversion of toluene in a fluidized bed photo-reactor were examined. Experimental results show that the AC/TiO2 overall toluene degrading efficiency, Ed, in the fluidized bed photo-reactor was better than Ed of using only active carbons in the fluidized bed photo-reactor was. When using only active carbons in the system, Ed remained as high as 90% for 80 minutes; while using the AC/TiO2 in the system, Ed remained the value of 90% for nearly 110 minutes. The performance of TiO2 coated active carbon, AC/TiO2 with range 5 wt% ~ 20 wt%. The optimum loading of TiO2 on the active carbons was found to be 13 wt%, and the highest Ed value was hand at relative humidity 30%. The toluene degradation kinetics was studied. The toluene adsorption step was assumed as the rate-determined-step. The apparent reaction rate constant kapp was derived as functions of the toluene adsorption constant, the mass transfer coefficient and the surface reaction rate constant.