Engineering silica membranes for separation performance, hydrothermal stability, and production scalability

Phenyl-incorporated polyorganosilica membranes with enhanced hydrothermal stability for H2/CO2 separation

“…The enhanced stability is also consistent for organically decorated silica networks. 3,17,25,44 Notably, HT-POSi38 exhibits the highest H 2 /CO 2 selectivity (19) compared to HT-POSi0 (16) and HT-POSi60 (11) (Table S9†), though the values would likely vary under different hydrothermal treatment conditions.…”

“…Water vapor exposure decreases the O/Si molar ratio because of the condensation of silanol groups, forming water molecules and losing oxygen atoms. 3,19,45,46 Intriguingly, it increases the C/Si molar ratio, presumably because the polysiloxane chains with higher C/Si molar ratios migrate from the bulk to the surface. 47,48 Phenyl-containing POSi membranes show smaller changes in the atomic ratios than POSi0 (Fig.…”

“…Silica membranes with unique porous structures that permeate H 2 and reject larger gas molecules such as CO 2 , CH 4 , and C 2 H 6 are attractive for hydrogen purification and recovery, an essential component of a hydrogen economy. 1–4 These membranes are often fabricated using a sol–gel or chemical vapor deposition (CVD) method, and the selective layer thickness can range from 0.2 to 10 μm, rendering good separation properties. 5,6 However, inorganic substrates are often used in these membranes, making large-scale production a great challenge.…”

“…5,6 However, inorganic substrates are often used in these membranes, making large-scale production a great challenge. 3,7–9…”

A steric hindrance-driven amorphization strategy on MOF/COF for boosting CO2 separation in mixed matrix membranes

“…1,2 However, many separation processes exhibit low energy utilization efficiency, leading to signicant energy waste. 3 For instance, CO 2 /CH 4 separation is a crucial step in natural gas utilization; the commonly used pressure swing adsorption method exhibits low separation efficiency. [4][5][6] In order to achieve the goal of greenhouse gas emission neutrality and sustainable development, reducing energy consumption is imperative.…”