Novel Dual Functional Membrane for Controlling Carbon Dioxide Emissions from Fossil Fueled Power Plants 
Project No.: FG26-04NT42120

  Microstructure of the composite membrane

Overview of the microstructure of the composite membrane comprising of: (1) a commericially available tubular or hollow fiber ceramic support; (2) a mesoporous surfactant-templated silica sub-layer with pore size 15-50 Å; and (3) a Microporous aminosilicate gas separation membrane layer with pore size 4-10 Å.

This completed University of New Mexico project was to develop a dual-function amine modified membrane capable of economically and efficiently removing carbon dioxide (CO2) emissions from the flue gas of coal-fired power plants. The use of such an amine-modified membrane, with high CO2 permeance and selectively, holds promise for reducing costs by avoiding the expensive absorber/stripper system required with existing amine-based technology.

This dual-function membrane is prepared by a unique sol-gel dip-coating process for depositing a microporous amino-silicate membrane on a porous tubular ceramic support. It consists of a microporous inorganic siliceous matrix, with amine functional groups physically immobilized or covalently bonded on the membrane pore walls. Strong interactions between the permeating CO2 molecules and the amine functional membrane pores will enhance surface diffusion of CO2 on the pore wall of the membrane, subsequently blocking other gases. The new membrane is expected to exhibit higher CO2 selectivity compared to prior membranes that separate gases based on differences in molecular size only.

Related Papers and Publications:


  • For further information on this project, contact the NETL Project Manager, José D. Figueroa.