Operating Behavior and Scale-Up of an ECPrOx Unit for CO Removal from Reformate for PEM Fuel Cell Application
Operating Behavior and Scale-Up of an ECPrOx Unit for CO Removal from Reformate for PEM Fuel Cell Application
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用于从 PEM 燃料电池应用的重整产品中去除 CO 的 ECPrOx 装置的操作行为和放大
DOI：
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发表时间：
2009
期刊：
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通讯作者：
K. Sundmacher
中科院分区：
文献类型：
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作者：
R. Hanke‐Rauschenbach;C. Weinzierl;M. Krasnyk;L. Rihko;Hui Lu;K. Sundmacher;K. Sundmacher
最近，一种涉及CO电化学优先氧化(ECPrOx)的方法被认为有可能在质子交换膜(PEM)燃料电池中取代PROX概念来深度脱除重整气中的CO。本文的第一部分从反应工程的角度讨论了这种ECPrOx单元的表征。基于空间集总等温模型，讨论了不同进料流量和CO进口摩尔分数时的定性选择性-转化率行为。提出了一个简单的两阶段机制来解释这些发现。贡献的第二部分考虑了关于两个ECPrOx反应堆级联的定性问题。对其电气连接配置的重要性进行了论证和解释。虽然电连接的两个电池与单个电池相比表现出几乎相同的选择性转化行为，但电串联连接可以在相同的CO转化下显著提高选择性。
Recently, an approach involving electrochemical preferential oxidation (ECPrOx) of CO was suggested as having the potential to replace the PrOx concept for deep CO removal from reformate gas in proton exchange membrane (PEM) fuel cells. The first part of this paper deals with the characterization of such an ECPrOx unit from a reaction engineering point of view. Based on a spatially lumped, isothermal model, the qualitative selectivity-conversion behavior is discussed for varying feed flow rates and CO inlet mole fractions. A simple two-phase mechanism is suggested that explains the findings. The second part of the contribution considers qualitative questions on cascading of two ECPrOx reactors. The crucial importance of the configuration of their electrical connection is demonstrated and explained. While two cells connected electrically in parallel exhibit almost the same selectivity-conversion behavior in comparison with a single cell, an electrical series connection enables a considerable increase in the selectivity at the same CO conversion.