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- W3082647700 abstract "• 80 nm thick sol-gel derived Ti-incorporated methyl-linked silica mixed network membranes were prepared. • The particle size of polymeric mixed oxide sols was in the range of 2–6 nm. • The membrane exhibited H 2 permeance of 1.6 × 10 −6 mol/m 2 s Pa with H 2 /C 3 H 8 ideal selectivity of 120 at 150 °C. • Ti-O addition densified membrane pore network which enhances the molecular sieving capability for C 3 H 6 /C 3 H 8 . Sol-gel derived Ti-incorporated methyl-linked silica mixed network membranes were successfully prepared by acid catalyzed co-polymerization of methyltriethoxysilane, tetraethylorthosilicate and titanium isopropoxide. The particle size of polymeric mixed oxide sols was in the range of 2–6 nm depending on the titanium content in the sol. As Ti 4+ /Si 4+ mole ratio in the sol increases, DLS polymer cluster size increases slightly due to the different reactivity of precursors. Ti 2p and Si 2p binding energy values obtained by XPS confirmed the evolution of Si-O-Ti bond in the membrane network. Macroporous α-alumina ceramic supports with different pore size as a support and mesoporous γ-alumina coating as an intermediate layer were used for the fabrication of thin titania/methyl-linked mixed network silica membranes. Increase in the number of coating led to an increase in the membrane thickness from 80 nm to 220 nm and this provided an enhancement in the H 2 /C 3 H 8 ideal selectivity (from 53 to 124). Decrease in the H 2 permeance, on the other hand, with increased membrane thickness was overcome with the use of coarser supports inhibiting the transport resistance. The membrane exhibited higher H 2 permeance value of 1.6 × 10 −6 mol/m 2 s Pa with almost same H 2 /C 3 H 8 ideal selectivity at 150 °C compared to its finer counterpart." @default.
- W3082647700 created "2020-09-08" @default.
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- W3082647700 date "2021-01-01" @default.
- W3082647700 modified "2023-09-24" @default.
- W3082647700 title "Sol-gel control on mixed network silica membranes for gas separation" @default.
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- W3082647700 doi "https://doi.org/10.1016/j.seppur.2020.117654" @default.
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