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
Personal Author(s):
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.
Descriptors:
- *CARBONATES
- *IONS
- *MEMBRANES
- *RAMAN SPECTROSCOPY
- BANDS(STRIPS)
- CARBON DIOXIDE
- CHEMICAL REACTIONS
- DENSITY FUNCTIONAL THEORY
- ELECTROCHEMISTRY
- EMISSION
- EXPOSURE(GENERAL)
- FLUX(RATE)
- HIGH DENSITY
- HIGH TEMPERATURE
- MATHEMATICAL MODELS
- OXIDES
- PERMEABILITY
- POROUS MATERIALS
- SEPARATION
- SYNTHESIS(CHEMISTRY)
- TRANSPORT PROPERTIES
Subject Categories:
- Inorganic Chemistry
- Physical Chemistry
- Optics