Microporous sol-gel derived aminosilicate membrane for enhanced CO2 separation.
- United Technologies Research Center (UTRC), East Hartford, CT
- University of New Mexico, Albuquerque, NM
A new aminosilicate, sol-gel derived microporous inorganic membrane has been developed for enhanced CO{sub 2} separation in applications such as removal of metabolic CO{sub 2} from the breathing loop of the NASA extravehicular mobility unit (EMU), natural gas purification, or CO{sub 2} capture from coal-fired power plant emissions. This membrane consists of an inorganic, amorphous silica matrix of pore size 4-5 {angstrom}, containing randomly dispersed amine (NH{sub 2}) functional groups in order to enhance its CO{sub 2} selectivity, due to preferential adsorption of CO{sub 2} in the membrane pore walls and simultaneous blocking of permeation of other gases (O{sub 2}, N{sub 2} and CH{sub 4}). It is found that the gas feed condition during permeation (partial pressure of CO{sub 2}, relative humidity), post-synthetic treatments and aging, affect significantly the separation performance of the membranes. At this stage of development, with feeds of 1-20 vol.% CO{sub 2} and 0-40% relative humidity at 22 C, the highest CO{sub 2}:N{sub 2} separation factor was in the range 100-200, while the CO{sub 2} permeance was in the range 0.1-1.5 cm{sup 3} (STP)/(cm{sup 2} min atm). The results suggest that controlling the membrane pore size and method of activation of amine groups are the most critical factors for improving the CO{sub 2}-permselectivity of the membrane.
- Research Organization:
- Sandia National Laboratories
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 959112
- Report Number(s):
- SAND2004-2957J
- Journal Information:
- Proposed for publication in Separation and Purification Technology., Journal Name: Proposed for publication in Separation and Purification Technology.
- Country of Publication:
- United States
- Language:
- English
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