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Issue 31, 2013
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First spectroscopic identification of pyrocarbonate for high CO2 flux membranes containing highly interconnected three dimensional ionic channels

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Abstract

Identification of the existence of pyrocarbonate ion C2O52− in molten carbonates exposed to a CO2 atmosphere provides key support for a newly established bi-ionic transport model that explains the mechanisms of high CO2 permeation flux observed in mixed oxide-ion and carbonate-ion conducting (MOCC) membranes containing highly interconnected three dimensional ionic channels. Here we report the first Raman spectroscopic evidence of C2O52− as an active species involved in the CO2-transport process of MOCC membranes exposed to a CO2 atmosphere. The two new broad peaks centered at 1317 cm−1 and 1582 cm−1 are identified as the characteristic frequencies of the C2O52− species. The measured characteristic Raman frequencies of C2O52− are in excellent agreement with the DFT-model consisting of six overlapping individual theoretical bands calculated from Li2C2O5 and Na2C2O5.

Graphical abstract: First spectroscopic identification of pyrocarbonate for high CO2 flux membranes containing highly interconnected three dimensional ionic channels

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Publication details

The article was received on 06 Jun 2013, accepted on 06 Jun 2013 and first published on 11 Jun 2013


Article type: Paper
DOI: 10.1039/C3CP52362D
Citation: Phys. Chem. Chem. Phys., 2013,15, 13147-13152
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    First spectroscopic identification of pyrocarbonate for high CO2 flux membranes containing highly interconnected three dimensional ionic channels

    L. Zhang, X. Huang, C. Qin, K. Brinkman, Y. Gong, S. Wang and K. Huang, Phys. Chem. Chem. Phys., 2013, 15, 13147
    DOI: 10.1039/C3CP52362D

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