Effects of ZrO2-promoter on catalytic performance of Cu RHA catalysts for production of hydrogen by partial oxidation of methanol

• Main Authors: Hui-tsung Lin, 林惠聰
• Other Authors: Feg-Wen Chang
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/96320122385491128032

碩士 === 國立中央大學 === 化學工程與材料工程研究所 === 98 === Using rice husk ash (RHA) as support, we prepared the Cu catalysts by deposition-precipitation method. ZrO2 was added as promoter to Cu/Zr/RHA catalysts and these nano-catalysts were tested for hydrogen production by partial oxidation of methanol to identify the activity. A detail study for physical property of Cu/Zr/RHA catalysts was analyzed by ICP-AES, TGA, XRD, N2O titration, TEM, and TPR. XRD results indicated that the copper diffraction peak of Cu/Zr/RHA was weaker than Cu/RHA, and the Cu diffraction peak would not increase with higher calcination temperature. It means ZrO2 phase stabilized the copper, preventing crystallite growth. N2O results and TEM images exhibited that ZrO2 enhanced Cu dispersion and Cu particle size was almost under 5 nm. TGA result suggests that the suitable calcination temperature is above 650 K. In TPR patterns, CuO reduction temperature was decreased by ZrO2, and this phenomenon was correlated to XRD. We tested the catalysts activity for various parameters such as promoter loading, calcination temperature, feed ratio and reaction temperature. Zirconium oxide was believed to enhance the activity of catalyst and the best operation parameters to optimize catalyst’s performance are calcination temperature 673 K; O2/CH3OH feed ratio 0.3 and reaction temperature 523 K.