Complete oxidation of toluene by Pd/Ce1-XZrXO2 and Pt introduced Pd/CeO2 catalysts

• Main Authors: Shih-Huai Chen, 陳世槐
• Other Authors: Sze-Ming Yang
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/75045472511620228198

碩士 === 國立中央大學 === 化學工程與材料工程研究所 === 97 === The main purpose of this thesis was to study toluene complete oxidation reaction over Pd/CeO2 and Pd/Ce1-XZrXO2. Two catalysts were investigated: One was Pd/CeO2 prepared by impregnation(IM) method, the other was zirconia promoted Pd/CeO2 (Pd/Ce1-XZrXO2) prepared by impregnation and co-precipitation of zirconia on CeO2 and then loading of palladium by impregnation (IM) method. On the other hand, the effect of adding Pt to Pd/CeO2 powder catalyst was also studied. The catalysts were characterized by XRD, TEM, BET, ICP, ESCA and H2-TPR techniques. The BET results (and activity tests) showed that introduced of small amount of zirconia to CeO2, the catalysts showed better thermal stability and less deactivation. The addition of suitable amount of platinum to Pd/CeO2 increased the proportion of metallic palladium (Pd0), and the catalytic activity increased. Complete oxidation of toluene over 1 wt.%Pd/Ce0.9Zr0.1O2-IW powder catalyst occured at 190 ℃, and the toluene conversion maintained above 98 % after 100 hours reaction.