Hydrogen Production by Reforming of Methanol over Pt/Zn Catalysts

• Main Authors: Rui-Xiang Wang, 王瑞翔
• Other Authors: Chuin-Tih Yeh
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/81288255463304368171

碩士 === 國立清華大學 === 化學系 === 94 === In this study, supported of Pt/Zn samples were prepared by the method of deposition precipitation. All the catalysts were characterized by TPR, XRD, TEM, ICP experiments. The activities were measured for reforming of methanol reactions, including partial oxidation of methanol (POM), steam reforming of methanol (SRM) and oxidative steam reforming of methanol (OSRM). We purpose to prepare catalysts with high MeOH conversion (CMeOH), H2 selectivity (SH2), and CO2 selectivity (SCO2). Pt2/Zn catalyst shows best activities after reduced by hydrogen at Tp = 400 ℃. TPR examinations indicated Cl ions can not be substantially removed by reduction at low temperatures (Tp = 200, 300 ℃). However, a H2 reduction at Tp = 500 ℃ deceases the activity of Pt2/Zn catalyst due to sintering of Pt particles at this high temperature. Pt/Zn catalysts were not active for SRM and OSRM reaction but showed good performance (CMeOH = 78 %, SH2 = 77 %, SCO2 = 95 %) at a low reaction temperature of TR = 120 ℃ and the catalysts can ignite at room temperature. To improve the SH2 of Pt/Zn catalyst, we mixed Pt/Zn and Ag/CeZn catalysts for POM reaction. The Pt/Zn-Ag/CeZn catalyst retains the advantage of igniting at room temperature and shows a high SH2 (86 %).