Combined generation and separation of hydrogen in an electrochemical water gas shift reactor (EWGSR)

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• 作者：C. Oettel^a ; L. Rihko-Struckmann^a ; ^{rihko@mpi-magdeburg.mpg.de} ; K. Sundmacher^a ; ^b
• 关键词：Electrochemical water gas shift reactor ; Hydrogen generation and separation ; Electrochemical carbon monoxide oxidation ; High temperature proton exchange membrane ; Poly(2 ; 5-benzimidazole) &ndash ; ABPBI ; Platinum ruthenium catalyst
• 刊名：International Journal of Hydrogen Energy
• 出版年：2012
• 期刊代码：42_03603199
• 类别：ch
• 出版时间：April, 2012
• 卷：37
• 期：8
• 页码：6635-6645
• 文件大小：547 K

摘要

Hydrogen rich gas, originating from fossil fuel reforming processes or biomass gasification, contains a significant amount of CO. Typically, the yield of H₂ is increased with subsequent water gas shift units, converting CO to CO₂ and additional H₂. This study describes a new reactor concept enabling the water gas shift reaction and the separation of the generated hydrogen in one process step by using electrical energy. This electrochemical water gas shift reactor applies a H₃PO₄-doped Poly(2,5-benzimidazole) membrane as electrolyte and carbon supported Pt or PtRu as anode catalyst. The reactor operation was investigated at 130聽掳C and 150聽掳C with a H₂ free anode feed stream of humidified CO and N₂. The experimental results show the feasibility of the reactor concept, as H₂ was generated at the cathode according to Faradays Law. Anodic PtRu led to lower power demands than Pt. The operation at the two temperatures showed that 130聽掳C results in a lower electrical power demand while generating an equal amount of H₂. The feasibility of the reactor was assessed using exergy efficiency analysis.