Highly purified hydrogen Obtained by using a composite SiO2-Al2O3 membrane at high operating temperatures

Development of hydrogen technologies demands efficient processes and materials for production, purification and storage. A ceramic membrane with a composite structure is prepared by depositing silica and alumina on the inner side of a tubular alumina support using dual element CVD method. FESEM images indicate formation of a dense layer with a thickness of about 100 nm. Permeation tests show that after 6 h of deposition, H2 permeance flux reduced from 5×10-5 mol/m2.s.Pa to 6.3×10-7 mol/m2.s.Pa, but high selectivities of 105 and 573 were obtained at 800°c for H2 over CO2 and CH4, respectively.

Highly purified hydrogen Obtained by using a composite SiO2-Al2O3 membrane at high operating temperatures Keywords:

Hydrogen purification , Gas permeation , Ceramicmembrane , Selectivity.