Document Type : Research Paper
Chemical Process & Energy Resources Institute, Centre for Research and Technology Hellas, Thessaloniki, Greece
Laboratory of Materials Technology, Chemical Engineering Department, Aristotle University of Thessaloniki, Thessaloniki, Greece
The gas separation performance of commercial ceramic Titania and hybrid silica (HybSi®) membranes was assessed using the gas permeation and permporometry methods. Results indicated that the HybSi® membranes have a hybrid surface containing regions covered by a polymeric matrix and others with inorganic pores. These membranes have high H2 selectivity, which increases significantly with temperature and after exposure to H2O vapors. On the other hand, Titania membranes have a very narrow pore size distribution in the low mesoporous or in the upper microporous range. These membranes have very high permeance but moderate selectivity which is not affected by H2O exposure.