Hydrogen production by water dissociation using ceramic membranes. Annual report for FY 2007.

Balachandran, U. ; Chen, L. ; Dorris, S. E. ; Emerson, J. E. ; Lee, T. H. ; Park, C. Y. ; Picciolo, J. J. ; Song, S. J. ; Systems, Energy

Argonne National Laboratory

关键词: Coal Gasification;    Boilers;    Oxidation;    Synthesis Gas;    Electric Power;   

DOI  :  10.2172/937404
RP-ID  :  ANL-08/12
RP-ID  :  DE-AC02-06CH11357
RP-ID  :  937404

美国|其它

来源: UNT Digital Library

【 摘 要 】

The objective of this project is to develop dense ceramic membranes that, without using an external power supply or circuitry, can produce hydrogen via coal/coal gas-assisted water dissociation. This project grew out of an effort to develop a dense ceramic membrane for separating hydrogen from gas mixtures such as those generated during coal gasification, methane partial oxidation, and water-gas shift reactions [1]. That effort led to the development of various cermet (i.e., ceramic/metal composite) membranes that enable hydrogen to be produced by two methods. In one method, a hydrogen transport membrane (HTM) selectively removes hydrogen from a gas mixture by transporting it through either a mixed protonic/electronic conductor or a hydrogen transport metal. In the other method, an oxygen transport membrane (OTM) generates hydrogen mixed with steam by removing oxygen that is generated through water splitting [1, 2]. This project focuses on the development of OTMs that efficiently produce hydrogen via the dissociation of water. Supercritical boilers offer very high-pressure steam that can be decomposed to provide pure hydrogen by means of OTMs. Oxygen resulting from the dissociation of steam can be used for coal gasification, enriched combustion, or synthesis gas production. Hydrogen and sequestration-ready CO{sub 2} can be produced from coal and steam by using the membrane being developed in this project. Although hydrogen can also be generated by high-temperature steam electrolysis, producing hydrogen by water splitting with a mixed-conducting membrane requires no electric power or electrical circuitry.