Synthesis of ordered mesoporous silica membrane on inorganic hollow fiber

Preparation and characterization of inorganic membranes for hydrogen separation

“…For the coated silica and Pt membranes, the N 2 permeate is less dependent of the feed pressure compared to that of the alumina support. This is an indication of a reduction in viscous flow with respect to the N 2 permeate on silica and Pt membranes which would occur in large pinholes if they were present [18]. These was also supported with the pore diameter values obtained ( Table 1).…”

“…It can be seen that, silica membrane obtained the highest factor of 2.93 at 0.9 barg, which is slightly lower than the expected value from the theoretical Knudsen diffusion (3.74). In this case, it is therefore possible that surface flow for N 2 at the top layer is the governing transport [18,19]. Fig.…”

Single Gas Permeation on γ-Alumina Ceramic Support

“…Approximately 10 μm thick alumina layer of highly intergrown alumina crystals was observed. Gas permeation Citation The adsorption-desorption isotherm exhibits a characteristics of mesopores solids (especially ceramics) resulting in Type IV physisorption isotherm according to the IUPAC recommendations which revealed the presence of mesoporous (20<pore size<500 Å) in the membrane undergoing capillary condensation and hysteresis during desorption [7][8][9].…”

Recent Progresses in Ceramic Hollow‐Fiber Membranes

“…Electroless plating Pd layers are deposited by electroless plating technique on a-Al 2 O 3 hollow fibers for H 2 separation [33] Hydrophobization Hydrophilic Alumina hollow-fiber membranes and their outer surfaces were modified to be hydrophobic by grafting with perfluorooctylethoxysilane (FAS) solution [45] Catalytic Functionalization Catalytic Ag particles were coated on surfaces of Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ (BSCF) hollow fibers using a chemical deposition method to enhance oxygen permeation [52] Acid etching method Perovskite La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 hollow-fiber membranes by a facile acid etching method to form a novel dual structure consisting of a central dense layer sandwiched by two porous layers on both surface sides [34] Direct deposition Simple deposition technique using an aqueous solution of titanium tetrafluoride to a thin and porous or dense TiO 2 layer on the Al 2 O 3 hollow-fiber support was obtained [27] Filtration Synthesis of ordered mesoporous silica membranes on the outer side of a-alumina hollow fibers by a filtration technique combined with an evaporation-induced self-assembly (EISA) process [43] surfaces, by grafting with 0.01 mol L -1 of 1H,1H,2H,2H-perfluorooctylethoxysilane (FAS) solution, to convert it to a hydrophobic membrane. Smid et al [50] prepared aluminum oxide and silicon nitride composite ceramic hollow-fiber membranes.…”

“…Li et al [43] developed a method for the preparation of mesoporous silica membranes on alumina hollow fibers. The filtration technique combined with an evaporation-induced self-assembly (EISA) process formed a continuous ordered mesoporous silica layer on the outer side of a-alumina hollow fibers.…”