Implementation of a carbon capture and storage (CCS) technology is the most promising solution to effectively stabilize the atmospheric CO2 concentration. The most important step of the CCS is the CO2 separation and the dual phase inorganic membranes have shown a great potential in this process. The dual phase membrane is often composed of a porous metal phase or oxide phase and a MC phase. In this work, the effect of SO2 on the CO2 permeation through a Ce0.8Sm0.2O1.9(SDC)-carbonate dual phase membrane has been investigated. The CO2 permeation flux of the SDC-carbonate membrane reaches 0.67 ml min-1 cm-2 at 750 oC. However, the value drops from 0.67 to 0.10 ml min-1 cm-2 after exposure to a SO2/N2=1:400 gas atmosphere (see Fig. 1, left) and there have a wide elemental distribution of S in the membrane of the post-testing proved by the SEM/EDS-mapping. The most of the S come from the product of the reaction between carbonate and SO2, which is testified by the results of the XRD and SEM/EDS. The SO2 can convert the carbonate of the membrane into the sulfate, which makes the content of carbonate decrease and the molten salt phase agglomerates. This is the most important factor for the decline of the CO2 flux of the membrane. The rate limiting step of CO32- transport may change into the CO32- conductivity in MC due to low conductivity of the molten salt phase after mixing a certain amount of sulfate in the carbonate. In addition, The results of the long-term stability of the CO2 permeation show that the degree of CO2 flux decrease has a significant correlation with SO2 concentration in the feed gas (see Fig 1, right).

Experimental verification of the poisoning effect of SO2 on the CO2 permeation through a Ce0.8Sm0.2O1.9-carbonate dual phase membrane

253rd National Meeting (2017)

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