Functionalized inorganic membranes for gas separation

A porous membrane for separation of carbon dioxide from a fluid stream at a temperature higher than about 200° C. with selectivity higher than Knudsen diffusion selectivity;

• said porous membrane comprising
• a porous support layer comprising alumina, silica, zirconia or stabilized zirconia;
• a porous separation layer comprising alumina, silica, zirconia or stabilized zirconia, and disposed on a surface of the porous support layer;
• and
• a functional layer disposed on surfaces of pores of the porous separation layer and contactable with the fluid stream to preferentially transport carbon dioxide, the functional layer comprising MgO, CaO, SrO, BaO, La2O3, CeO2, TiO2, Y2O3, ATiO3, AZrO3, AAl2O4, A1FeO3, A1MnO3, A1CoO3, A1NiO3, A2HfO3, A3CeO3, Li2ZrO3, Li2SiO3, Li2TiO3 or a mixture thereof;
• wherein A is Mg, Ca, Sr or Ba;
• A1 is La, Ca, Sr or Ba;
• A2 is Ca, Sr or Ba;
• and
• A3 is Sr or Ba.

A porous membrane for separation of carbon dioxide from a fluid stream at a temperature higher than about 200° C. with selectivity higher than Knudsen diffusion selectivity;

• said porous membrane comprising
• a porous support layer comprising alumina, silica, zirconia or stabilized zirconia;
• a porous separation layer comprising alumina, silica, zirconia or stabilized zirconia, and disposed on a surface of the porous support layer;
• and
• a porous functional layer disposed within and at least partially filling pores of the porous separation layer, and contactable with the fluid stream to preferentially transport carbon dioxide, the functional ceramic layer comprising MgO, CaO, SrO, BaO, La2O3, CeO2, TiO2, Y2O3, ATiO3, AZrO3, AAl2O4, A1FeO3, A1MnO3, A1CoO3, MnO3, A1CoO3, A1NiO3, A2HfO3, A3CeO3, Li2ZrO3, Li2SiO3, Li2TiO3 or a mixture thereof;
• wherein A is Mg, Ca, Sr or Ba;
• A1 is La, Ca, Sr or Ba;
• A2 is Ca, Sr or Ba;
• and
• A3 is Sr or Ba.

A porous membrane for separation of carbon dioxide from a fluid stream at a temperature higher than about 200° C. with selectivity higher than Knudsen diffusion selectivity;

• said porous membrane comprising
• a porous support layer comprising alumina, silica, zirconia or stabilized zirconia;
• a porous separation layer comprising alumina, silica, zirconia or stabilized zirconia, and disposed within and at least partially filling pores of the porous support layer;
• and
• a functional layer disposed on surfaces of pores of the porous separation layer, and contactable with the fluid stream to preferentially transport carbon dioxide, the functional layer comprising MgO, CaO, SrO, BaO, La2O3, CeO2, TiO2, Y2O3, ATiO3, AZrO3, AAl2O4, A1FeO3, A1MnO3, A1CoO3, A1NiO3, A2HfO3, A3CeO3, Li2ZrO3, Li2SiO3, Li2TiO3 or a mixture thereof;
• wherein A is Mg, Ca, Sr or Ba;
• A1 is La, Ca, Sr or Ba;
• A2 is Ca, Sr or Ba;
• and
• A3 is Sr or Ba.

A method for separating carbon dioxide from a fluid stream at a temperature higher than about 200° C. with selectivity higher than Knudsen diffusion selectivity, said method comprising contacting a porous membrane with the fluid stream to preferentially transport carbon dioxide thereacross, the porous membrane comprising

• a porous support layer comprising alumina, silica, zirconia or stabilized zirconia;
• a porous separation layer comprising alumina, silica, zirconia or stabilized zirconia, and
• a functional layer comprising MgO, CaO, SrO, BaO, La2O3, CeO2, TiO2, Y2O3, ATiO3, AZrO3, AAl2O4, A1FeO3, A1MnO3, A1CoO3, A1NiO3, A2HfO3, A3CeO3, Li2ZrO3, Li2SiO3, Li2TiO3 or a mixture thereof;
• wherein A is Mg, Ca, Sr or Ba;
• A1 is La, Ca, Sr or Ba;
• A2 is Ca, Sr or Ba;
• and
• A3 is Sr or Ba.

A porous membrane for separation of carbon dioxide from a fluid stream at a temperature higher than about 200° C. with selectivity higher than Knudsen diffusion selectivity;

• said porous membrane comprising
• a porous support layer comprising alumina, silica, zirconia or stabilized zirconia;
• a porous separation layer comprising alumina, silica, zirconia or stabilized zirconia, and
• a functional layer comprising MgO, CaO, SrO, BaO, La2O3, CeO2, TiO2, Y2O3, ATiO3, AZrO3, AAl2O4, A1FeO3, A1MnO3, A1CoO3, A1NiO3, A2HfO3, A3CeO3, Li2ZrO3, Li2SiO3, Li2TiO3 or a mixture thereof;
• wherein A is Mg, Ca, Sr or Ba;
• A1 is La, Ca, Sr or Ba;
• A2 is Ca, Sr or Ba;
• and
• A3 is Sr or Ba.