CO2 SELECTIVE CERAMIC MEMBRANE FOR WATER-GAS SHIFT REACTION WITH CONCOMITANT RECOVERY OF CO2

Presently we have focused on the membrane synthesis, hydrotalcite surface and transport mechanism characterization, and quantitative measurement on CO{sub 2} reversibility. This quarterly report presents the results from the surface characterization study. FTIR, DRIFTS and TGA/MS have been used to quantitatively characterize the thermal behavior of hydrotalcite materials. Based upon these characterization results, a thermal evolution pattern accounting for the loss of interlayer water, hydroxyl group, and CO{sub 2} is proposed for the hydrotalcite we studied. According to the DRIFTS results, a small amount of CO{sub 2} release ({approximately}2wt%) was observed at {approximately}220 C, while the remaining releases at {approximately}450 C. TGA/MS result is consistent with the amount and the temperature region estimated from DRIFTS. Both regions are possible candidates for transport of CO{sub 2} in a membrane configuration. In the next quarter, we will conduct adsorption/desorption study to verify the reversibility of the CO{sub 2} released from these two regions