276780 High Temperature Dual-Phase Inorganic Membranes for Carbon Dioxide Separation

Tuesday, October 30, 2012: 9:30 AM
401 (Convention Center )
Jerry Lin1,2, Tyler Norton3, Zebao Rui4 and Jose Ortiz3, (1)School for Enginering of Matter, Transport and Energy, Arizona State University, Tempe, AZ, (2)Department of Chemical and Materials Engineering, Arizona State University, Tempe, AZ, (3)Arizona State University, Tempe, AZ, (4)School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ

Electrical generation from fossil fuels results in emission of carbon dioxide into atmosphere causing global warming.  The challenge is how to effectively capture carbon dioxide before other alternative non-fossil energy resources are developed to replace the fossil fuels.  There are three strategies to capture carbon dioxide from power plants burning fossil fuels:  post-combustion carbon dioxide removal, pre-combustion carbon removal andoxyfuelcombustion processes.    High temperature CO2 perm-selective inorganic membranes will play a critical role in these processes.  All microporous inorganic membranes showing high CO2/N2 selectivity at room temperature become non-selective for CO2 separation at high temperatures due to low diffusion controlled selectivity for molecules of similar sizes. The talk will focus on new dual-phase membranes that permeate only carbon dioxide at high temperatures.  The dual-phase membranes consist of a metal or oxygen ionic conducting oxide phase and a molten carbonate phase which conduct respectively electrons or oxygen ions and carbonate ions.  When using metal as the solid phase, the membranes permeate both CO2 and O2 in 2:1 ratio.  Dual-phase membranes consisting of a mixed electronic and ionic conducting or oxygen ionic conducting ceramic solid phase permeate CO2 with CO2permeace upto 10-7mol/m2.s.Pa with CO2/N2 selectivity up to 3000 in temperature range from 500-900oC.   The activation energy for CO2 permeation through these dual-phase membranes is in the range of 80-110 kJ/mol, depending on the ceramic phase. CO2 permeation flux is controlled by oxygen ionic conductivity in the ceramic phase. Results will be presented showing improvement of CO2permeance by using a ceramic phase with higher oxygen ionic conductivity or preparing membranes with small thickness.

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See more of this Session: Session I In Honor of Prof William Krantz
See more of this Group/Topical: Separations Division