화학공학소재연구정보센터
Separation Science and Technology, Vol.49, No.9, 1309-1316, 2014
The Effect of Hydrotalcite Content in Microporous Composite Membrane on Gas Permeability and Permselectivity
Microporous silica membrane containing hydrotalcite (HT) was prepared successfully without losing the former's molecular sieving property. The microporous HT-silica membrane (200 nm in thickness) was formed on the surface of mesoporous -alumina layer (9 m in thickness) and supported by macroporous -alumina substrate (ca. 2 mm in thickness). The pore size of the microporous HT-silica membrane was 8.5 angstrom, slightly larger than the pristine silica membrane (5 angstrom). The composite membrane was found to enhance the permeability of gases and permselectivity of carbon dioxide from gas mixture comprising methane, hydrogen or nitrogen. Microporous HT-silica membrane with 15 vol.% HT displayed the highest permselectivities in the order of CO2/CH4 > CO2/N-2 > CO2/H-2 and the permselectivities decreased with increasing HT content.