Desorption of IPA from Bead-Shaped Activated Carbon via Nonthermal Plasma

• Main Authors: Chen-han Hsiao, 蕭辰翰
• Other Authors: Moo-been Chang
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/56736905181636594647

碩士 === 國立中央大學 === 環境工程研究所 === 99 === How to effectively reduce volatile organic compound (VOC) emission into atmosphere has become an important environmental issue. Adsorption is commonly used as a control technique for reducing VOC emissions. Activated carbon and molecular sieve are generally used as absorbent materials which can be regenerated by desorption process either via temperature swing or pressure swing. However, these processes require additional energy for creating high temperature gas or low-pressure condition needed for desorption. A novel technique applying nonthermal plasma for effective desorption of VOCs from the absorbent materials by high energy electron impacts and excited molecules interaction is developed. This study evaluates the effectiveness of nonthermal plasma as a tool for the desorption of IPA from the bead-shaped activated carbon. The experimental results indicate that the IPA desorption efficiency obtained by different background gas are in the order as：N2 (82.14%) > AIR (47.05%) > O2 (34.34%), the products detected after plasma desorption include CO2, CO, and acetone when air or oxygen is used. The IPA desorption efficiency increases by approximately 5.1~8.4 % as the background gas flow rate is increased from 1000 to 2000 sccm. The BET surface area of bead-shaped activated carbon after repeated adsorption and plasma desorption decreases while the average pore diameter increases, and the amount of oxygen functional groups at surface increase as well.