The mechanism and application studies of hydrogenation reaction for metal catalyst on zero-valent metal

• Main Authors: Chin-Yuan Huang, 黃金源
• Other Authors: Shu-fen Cheng
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/kwa76z

碩士 === 朝陽科技大學 === 環境工程與管理系碩士班 === 92 === Chlorinated organic compounds and nitrate are the main contaminates in the environmental field. Recently, they were often found in contaminated soil and groundwater. There is one common characteristic between chlorinated organic compounds and nitrate.They all fit to remove by reduction technique. In recent years, zero-valent treatment technique was widely studied. It had the reduction potential for chlorinated organic compounds and nitrate. Therefore, the researches focused on the relative remediation techniques. Bimetallic was developed from the zero-valent metal technique to improve the low-reactive problem of single zero-valent metal. Nickel and palladium were often used as the materials of the bimetallic. The first work was to study the main mechanism for the reduction reaction in the zero-valent metal and bimetallic treatment system. Besides , nickel and palladium were known as the good catalysts in the reduction hydrolysis reaction. The second purpose was to access the feasibility for combining hydrolysis catalyst nickel and hydrogen to produce the dechlorination or denitrification. The results indicated, in the zero-valent metal including iron,aluminum and zinc and bimetallic including iron/nickel and zinc/nickel, the main reduction mechanism was direct transference of electrons from the metal surface to compounds. When the surface of metal lost its active site, the catalysis reaction of bimetallic was significantly important. The results also indicated that the combination of nickel catalyst and hydrogen could produce a stable and rapid denitrification reaction of nitrate. In the future , it is worthy to conduct more studies to assess its feasibility of application in the water treatment.