Abstract: Proton exchange membrane fuel cells require the CO content in hydrogen-rich fuel feed less than 10 ?L/L. CO preferential oxidation is an effective method for the deep removal of CO. A fixed bed reactor for CO preferential oxidation was designed and developed. The influence of catalyst loading pattern，CO space velocity and O2 to CO molar ratio on reactor performance was experimentally investigated. The experimental results showed that a three-layers loading of catalyst diluted by γ-Al2O3 powder favored the reactor performance. The outlet CO concentration was reduced to 7 ?L/L when the O2 to CO molar ratio was 2.8. The outlet CO concentration was maintained less than 10 ?L/L and the catalyst bed temperature distribution was uniform during a 20-hours continuous operation of the reactor.

Key words: fixed bed reactor, CO preferential oxidation, CO space velocity, O₂ to CO ratio

摘要： 质子交换膜燃料电池需要CO含量低于10 mL/L的富氢合成气作为燃料。CO优先氧化是一种深度脱除CO的有效方法。设计了一种CO优先氧化反应器，考察了催化剂装填方式、CO空速和氧碳比对反应器性能的影响。结果表明：对于所测试的操作条件，催化剂稀释之后分三段装填有利于反应器床层温度的均匀分布和出口CO浓度的降低；氧碳比越高出口CO浓度越低，当氧碳比为2.8时出口CO浓度为7 mL/L。连续20 h的测试表明，反应器床层温度分布均匀，出口CO浓度保持在10 mL/L以下。

关键词: 固定床反应器, CO优先氧化, 空速, 氧碳比