Study on Treatments of Vapors Containing Volatile Organics by Activated Carbon Adsorption and Catalytic Incineration

• Main Authors: Tsai, Wen-Tien, 蔡文田
• Other Authors: Chang, Ching-Yuan
• Format: Others
• Language: zh-TW
• Published: 1994
• Online Access: http://ndltd.ncl.edu.tw/handle/64078514347639194286

博士 === 國立臺灣大學 === 環境工程研究所 === 82 === In this work, adsorption and catalytic incineration of the dilute methylene chloride (METH) and 1,1,1-trichloroethane (TCEA) vapors in air were investigated by using activated carbons (BPL/PCB) and chromium oxide catalyst, respectively. The experimental results of activated carbon adsorption indicate that the adsorption of the target VOC onto the activated carbons BPL and PCB has been found to well follow the Langmuir, Freundlich, and Dubinin- Radushkevich (D-R) equations. The above results of the ability and capacity of adsorption are consistent with the relationships between the Langmuir adsorption equilibrium constant and adsorption temperature. The experimental results also indicate that a higher relative humidity evidently decreases the adsorption capacity, especially for the activated carbon BPL. All the results can be reasonably explained by the measured physical and chemical properties of the activated carbons, and the properties of the adsorbates. The experimental results of catalytic incineration indicate that the reaction temperature is a determining factor in the catalytic incineration. The catalytic oxidation reaction of TCEA may be divided into two stages. The first stage is a 1, 2-elimination reaction, forming the intermediate product 1,1-dichloroethylene (DCE). The second stage is the complete catalytic oxidation of DCE, forming the oxidation products such as CO2, HCl, etc. The experimental results may be reasonably fitted by using the pseudo- first-order reaction kinetic equatiion, and activation energies were obtained therefore. No phosgene was detected. Further, reaction mechanisms were proposed to qualitatively explain the experimental results. properties of carbons, and the properties of the adsorbates.