Hydrogen Production by Oxidative Steam Reforming of Methanol over Cu/RHA-ZnO Catalysts

• Main Authors: Yuan-ting Yeh, 葉元婷
• Other Authors: Feg-wen Chang
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/82440939307246915458

碩士 === 國立中央大學 === 化學工程與材料工程研究所 === 97 === Cu/RHA-ZnO catalysts were studied for oxidative steam reforming of methanol (OSRM, CH3OH + 0.5H2O + 0.25O2 → 2.5H2 + CO2) to produce hydrogen. Rice husk ash (RHA) was used to prepare RHA-ZnO binary supports by incipient wetness impregnation method and the catalysts were prepared by deposition-precipitation method with the binary support. The catalysts and supports were characterized by ICP-AES, XRD, TPR, N2O titration, TEM and SEM analyses. The average diameter of Cu particles was determined by TEM and N2O titration. XRD was used to study the crystallinity of the catalysts. The TPR results stated that redox properties of catalysts depended on the RHA/ZnO molar ratios. From N2O titration, TEM and SEM results, it was concluded that ZnO played minor role on controlling particle size of copper. However, the appropriate amount of Zn in catalysts is beneficial for activity. The effects of several experimental parameters of this study such as Si/Zn ratio, calcination temperature, reduction temperature, composition of feeding and reaction temperature had been discussed. The Cu/RHA-ZnO catalyst with Si/Zn atomic ratio at 9/1, calcined at 673 K and reduced at 573 K exhibits the optimum CH3OH conversion, H2 production rate and CO selectivity. The most suitable reaction temperature is 523 K with the feed ratio of H2O/CH3OH/O2 = 1/1/0.3 for OSRM reaction.