Dual Phase Membrane for High Temperature CO(sub 2) Separation. Annual Technical Progress Report.

Lin, J. Y. S. ; Chung, S. ; Anderson, M.

Technical Information Center Oak Ridge Tennessee

关键词: Carbon dioxide;    Membranes;    High temperature;    Separation processes;    Schematic diagrams;   

RP-ID  :  DE2005838118

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

This project is intended to expand upon the previous year's research en route to the development of a sustainable dual phase membrane for CO(sub 2) separation. It was found that the pores within the supports had to be less than 9 (micro)m in order to maintain the stability of the dual phase membrane. Pores larger than 9 (micro)m would be unable to hold the molten carbonate phase in place, rendering the membrane ineffective. Calculations show that 80% of the pore volume of the 0.5 media grade metal support was filled with the molten carbonate. Information obtained from EDS and SEM confirmed that the molten carbonate completely infiltrated the pores on both the contact and non-contact size of the metal support. Permeation tests for CO(sub 2) and N(sub 2) at 450-750 C show very low permeance of those two gases through the dual phase membrane, which was expected due to the lack of ionization of those two gases. Permeance of the CO(sub 2) and O(sub 2) mixture was much higher, indicating that the gases do form an ionic species, CO(sub 3)(sup 2-), enhancing transport through the membrane. However, at temperatures in excess of 650 C, the permeance of CO(sub 3)(sup 2-) decreased quite rapidly, while predictions showed that permeance should have continued to increase. XRD data obtained form the surface of the membrane indicated the formation of lithium iron oxides on the support.