Accession Number:

ADA626911

Title:

First Spectroscopic Identification of Pyrocarbonate for High CO2 Flux Membranes Containing Highly Interconnected Three Dimensional Ionic Channels

Descriptive Note:

Journal article

Corporate Author:

BENEDICT COLL COLUMBIA SC

Report Date:

2013-01-01

Pagination or Media Count:

9.0

Abstract:

Identification of the existence of pyrocarbonate ion C2O5exp2- 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 C2O5exp2- 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 cmexp -1 and 1582 cmexp -1 are identified as the characteristic frequencies of the C2O5exp2- species. The measured characteristic Raman frequencies of C2O5exp2- are in excellent agreement with the DFT-model consisting of six overlapping individual theoretical bands calculated from Li2C2O5 and Na2C2O5.

Subject Categories:

  • Inorganic Chemistry
  • Physical Chemistry
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE