The goal of this State University of New York (SUNY) – Buffalo project is to develop scalable membrane technology by engineering polymers to achieve superior hydrogen (H2)/carbon dioxide (CO2) separation properties in readily fabricated and easily deployed membranes. The application is for capture of CO2 from coal derived syngas. Specifically, the approach is to derive carbon molecular sieve (CMS) membranes from polybenzimidazole (PBI) doped with polyprotic acids, with the expectations that they will be chemically stable, be able to operate in temperatures up to 300°C, be easily scalable, and have high H2 permeance and H2/CO2 selectivity. The scope of the work is to improve CMS hollow fiber membrane characteristics, fabricate small membrane modules, and perform testing with simulated syngas to establish module/membrane CO2 separation performance and robustness. Data from testing is to inform techno-economic analysis (TEA) to determine process costs for large-scale carbon capture in an integrated gasification combined cycle (IGCC) plant scenario.