https://digital.library.unt.edu/ark:/67531/metadc620346/m2/1/high_res_d/14830.pdf

Dual-Layer Asymmetric Microporous Silica Membranes

https://ris.utwente.nl/ws/files/182468262/Lange95formation.pdf

Formation and characterization of supported microporous ceramic membranes prepared by sol-gel modification techniques

Over the past several decades, inorganic membranes composed of zeolite, silica, carbon, and metal/organic frameworks (MOF) have improved dramatically in terms of fabrication and application. Pure silica (SiO2) and organosilica membranes for use in molecular separation are the focus of this review. First, the fabrication of these silica-based membranes is outlined to highlight the great progress achieved in sol–gel and CVD processing. Then, applications in gasand liquid-phase separations and an evaluation of pore sizes are summarized and future perspectives are discussed.

Silica-Based Membranes with Molecular-Net-Sieving Properties: Development and Applications

Sol-gel processed magnesium-doped silica membranes with improved H2/CO2 separation

Porous membrane separation is a competitive hydrogen purification technology due to the advantages of environmental friendliness, energy-saving, simple operation, and low cost. Benefiting from the booming development of materials science and chemical science, great progress has been made in H2 separation with porous membranes. This review focuses on the latest advances in the design and fabrication of H2 separation inorganic microporous membranes, with emphasis on the synthetic strategies to achieve structural integrity, continuity and stability. This review starts with a brief introduction to the membrane separation mechanisms, followed by an elaboration on the synthetic challenges and corresponding solutions of various high-performance inorganic microporous membranes based on zeolites, silica, carbon, and metal-organic frameworks (MOFs). At last, by highlighting the prospects of ultrathin two-dimensional (2D) porous membranes, we wish to shed some light on the further development of new materials and membranes for highly efficient hydrogen separation.

https://www.sciopen.com/article_pdf/1532237045942554626.pdf

Inorganic microporous membranes for hydrogen separation: challenges and solutions

Films of amorphous SiO_2 were deposited within the walls of porous Vycor tubes by SiH_4 oxidation in an opposing-reactants geometry: SiH_4 was passed inside the tube while O_2 was passed outside the tube. The two reactants diffused opposite to each other and reacted within a narrow front inside the tube wall to form a thin SiO_2 film. Once the pores were plugged the reactants could not reach each other and the reaction stopped. At 450°C and 0.1 and 0.33 atm of SiH_4 and O_2, the reaction was complete within 15 min. The thickness of the SiO_2 film was estimated to be about 0.1 μ. Measurements of H_2 and N_2 permeation rates showed that the SiO_2 film was highly selective to H_2 permeation. The H_2: N_2 flux at 450°C varied between 2000 and 3000. Thermal annealing at 600°C reduced somewhat that selectivity. Thermal annealing in the presence of H_2O vapor decreased further the flux of H_2 and increased the flux of H_2. Permeation of H_2 is believed to occur through an activated diffusion mechanism. Applications of such H_2-permeable films to membrane reactors for equilibrium-limited reactions are discussed.

Deposition of H_2-permselective SiO_2 films

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Deposition of H_2-permselective SiO_2 films