Composite-alumina-carbon molecular sieve membranes prepared from novolac resin and boehmite. Part II: Effect of the carbonization temperature on the gas permeation properties
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Novolac phenolic resin
The influence of carbonization temperature on the permeation properties and aging of thin (4 mm) supported carbon molecular sieve membranes (c-CMSM), prepared from in house synthesized novolac phenolic resin loaded with boehmite nanoparticles, were studied. Just after membrane carbonization (fresh membrane), high permeance to N2 and O2 and low O2/ N2 permselectivities were observed; the highest permeations were observed for carbonization end temperatures between 500 C and 700 C. After leaving the c-CMSM 1 day in the air, a large decrease in the permeation and considerable increase in the permselectivity were observed due to the reduction of the pore size by oxygen chemisorption and wáter physical adsorption; the permeability to H2 and H2/N2 ideal permselectivity for a membrane carbonized at 550 C are close to palladium membranes for low temperatura (<100 C). The effect of the permeation characteristics of the membranes carbonized at various temperatures and the removal of water ...