Enhancing co-production of H2 and syngas via water splitting and POM on surface-modified oxygen permeable membranes
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AbstractIn this article, we report a detailed study on co-production of H2 and syngas on La0.9Ca0.1FeO3−δ (LCF-91) membranes via water splitting and partial oxidation of methane, respectively. A permeation model shows that the surface reaction on the sweep side is the rate limiting step for this process on a 0.9 mm-thick dense membrane at 990°C. Hence, sweep side surface modifications such as adding a porous layer and nickel catalysts were applied; the hydrogen production rate from water thermolysis is enhanced by two orders of magnitude to 0.37 μmol/cm2•s compared with the results on the unmodified membrane. At the sweep side exit, syngas (H2/CO = 2) is produced and negligible solid carbon is found. Yet near the membrane surface on the sweep side, methane can decompose into solid carbon and hydrogen at the surface, or it may be oxidized into CO and CO2, depending on the oxygen permeation flux.
CitationWu X-Y, Ghoniem AF, Uddi M (2016) Enhancing co-production of H2 and syngas via water splitting and POM on surface-modified oxygen permeable membranes. AIChE Journal 62: 4427–4435. Available: http://dx.doi.org/10.1002/aic.15518.
SponsorsThe authors would like to thank both Shell and the King Abdullah University of Science and Technology (KAUST) for funding the research. This contribution was identified by Dr. Dushyant Shekhawat (National Energy Technology Laboratory) as the Best Presentation in the session “Fuel Processing for Hydrogen Production” of the 2015 AIChE Annual Meeting in Salt Lake City.