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The objective of this project is the development of a new high temperature, affinity-type CO2-selective membrane. This membrane has the potential to find use in novel reactive applications of relevance to IGCC plants. In this project we have utilized a variety of methods to prepare affinity-type CO2-selective membranes. We have used a number of hydrotalcite (HT) sources and supports. We have also prepared two types of membranes, large area membrane disks and tubes, and micromembranes prepared on stainless steel foils and silicon wafers. Quality nanoporous membranes have been prepared, which show significantly higher permeation rates for gases with smaller kinetic diameters like He (used here as a safe surrogate gas for hydrogen) as compared to gases with larger kinetic diameters like Ar. Some of these membranes are selective towards CO2. The effect of preparation conditions on the membrane transport characteristics have also been studied and are reported here.

Layered Materials as High Temperature Membranes in Hydrogen Production