| Summary: | 碩士 === 逢甲大學 === 化學工程學所 === 98 === Abstract
In recent years the climate change due to global warming and the era of high oil prices, the development of clean and renewable energy has been imperative for the developed countries. Fuel cell have been one of the most potential candidates for the future of clean energy installations. Nowadays﹐hydrogen as fuel is primarily produced by steam reforming of methane； besides methane, autothermal steam reforming of methanol for H2 has given much attention because methanol has a high H/C ratio and is easy for transportation and storage, but the follow-up treatments are quite complicated and energy consumption. In this study we have used a Pd-Ag alloy membrane reactor which combines the autothermal steam reforming of methanol and separation of pure hydrogen in one unit and have sought optimal operating conditions.
Homemade Cu/Zn/Mg/Al2O3 catalysts were used for both the traditional reactor and the membrane reactor experiments to seek the effects of changing the temperature, WHSV, pressure, molar ratio of methanol and water, molar ratio of methanol and oxygen and sweep gas flow rates on methanol conversion, hydrogen recovery rate and the selectivity of CO and CO2. The experimental results showed that the amount of oxygen added will determine the heat balance；at 350 ℃, 5atm, WHSV = 5h-1, H2O/O2/CH3OH = 1/0.3/1, the highest yield of hydrogen can achieve 80%. Under the same conditions, the Pd-Ag alloy membrane reactor yielded higher methanol conversion than the traditional reactor did.
Keywords: autothermal steam reforming of methanol, Pd-Ag alloy membrane, copper and zinc catalyst.
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