Adsorption and ozone oxidation of MEK vapor on activated carbon with TiO2 addition

• Main Authors: Chou Ming Chieh, 周明杰
• Other Authors: 尤建華
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/43174588353815103546

碩士 === 長庚大學 === 化工與材料工程研究所 === 93 === In this research, the activated carbon was impregnated with TiO2. The depositions of TiO2 catalytic nanoparticles can be achieved. The properties of specific surface area, and pore volume of the adsorbent were analyzed. An adsorption process in combination with an ozone oxidation process is studied for the control of MEK vpor. The adsorption apparatus and TGA instrument were used to measure the adsorption characteristics, such as adsorption capacity, adsorption rate, isotherm adsorption, and breakthrough curve, and kinetic data of adsorption and thermal desorption for MEK vapor. In addition, the extent to which TiO2 supported affects activated carbon for adsorption and thermal desorption was also evaluated. From the experimental results, the specific surface area of AC-TiO2 was decreased and micropore diameter was increased. But, the fractal dimensions were not changed significant. The reason was that when AC is impregnated with TiO2, the pores of activated carbon may be blocked and hinders the favorable geometrical arrangement of adsorbed molecules over the surface. The adsorption capacities of 300 ppm MEK vapor on AC-TiO2 were 0.054 -0.2631 g/g at 30 – 90 ℃ and were more than those of AC by 5-14%. The destructive efficiency of MEK vapor on AC or AC-TiO2 with 1000 ppmv O3 both are about 10-43%, even if the adsorption bed is exhausted. Thermal desorption tests revealed that the Tm of the activated carbon with TiO2 additive significantly decreased by about 10-30℃ in the thermal desorption process. The apparent activation energies of adsorbents for MEK in the thermal desorption process were 22 - 32 kJ/mole. The influences of TiO2 additive on the activated carbon were attributed to both increases of the apparent activation energy and the rate constant. But, the influences of O3 on the adsorption were attributed to both decreases of the apparent activation energy and the rate constant.