Deep Oxidation of VOCs Using Pt/BN Catalyst

• Main Authors: Pan Jen-Wei, 潘仁偉
• Other Authors: Jeffery Chi-Sheng Wu
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/68587224663465667464

碩士 === 國立臺灣大學 === 化學工程學研究所 === 88 === The objective is to investigate the catalytic destruction of VOCs via Pt catalysts. The effort is focused on the complete oxidation of gasoline and BTX vapors. Activated carbon, alumina and boron nitride (BN) were used as supports. The 0.37wt% Pt catalysts were prepared by incipient wetness method. The light off temperature of BTX oxidation(640ppmv) was found in the range of 190-220℃. The catalytic destruction of gasoline vapor was carried out with the concentration of 2500 ppmv from 100 to 500℃. Instead of deactivation, the activity of Pt/BN increased significantly during the second run of oxidation. The light off temperature decreased from 210℃ to 160℃ after the first run of oxidation. Furthermore the temperature of 90% conversion can be achieved below 200℃ during the second run of oxidation. The surface of catalysts could be cleaned and Pt clusters could be oxidized to PtxOy during the first run of oxidation, which enhanced the oxidation ability of catalysts. Meanwhile, Pt clusters may sinter severely and Pt could be covered by alumina because of the low thermal stability of alumina. Therefore the activity of Pt/Al2O3 was deactivated in the second run of oxidation. The apparent combustion of activated carbon was found during oxidation over 260oC. Long term VOCs oxidation indicated that Pt/BN activity did not decay. High thermal conductivity of BN may be the reason, which prevents the Pt sintering. Moreover, high thermal stability of BN structure prevents Pt deactivation. Therefore Pt/BN demonstrates potential application in the catalytic destruction of VOCs.