Abstract
Organosilica membranes are a type of novel materials derived from organoalkoxysilane precursors. These membranes have tunable networks, functional properties and excellent hydrothermal stability that allow them to maintain high levels of separation performance for extend periods of time in either a gas-phase with steam or a liquid-phase under high temperature. These attributes make them outperform pure silica membranes. In this review, types of precursors, preparation method, and synthesis factors for the construction of organosilica membranes are covered. The effects that these factors exert on characteristics and performance of these membranes are also discussed. The incorporation of metals, alkoxysilanes, or other functional materials into organosilica membranes is an effective and simple way to improve their hydrothermal stability and achieve preferable chemical properties. These hybrid organosilica membranes have demonstrated effective performance in gas and liquid-phase separation.
Highlights
Molecular separation and purification are very important processes in chemical engineering and environmental protection
These results show that a higher calcination temperature accelerates the condensation of silanol groups, which results in smaller pore sizes
Membranes efficient2019, gas 9,separation with He/N2 selectivity of 196. These results reveal that plasma-enhanced CVD (PECVD) is an attractive technique organosilica membranes at low temperature, which probably helps to use
Summary
Molecular separation and purification are very important processes in chemical engineering and environmental protection. As one important type of inorganic membranes, silica-based membranes have molecular pore sizes and high thermal stability with excellent separation performance. Small pore sizes of pure silica membranes increase unnecessary transport resistance in the separation of H2 from larger molecules such as separation systems for H2 /C3 H8 and H2 /SF6 , etc These disadvantages restrict the membranes to most gas or liquid-phase applications. 1.5) derived from organoalkoxysilanes was developed in 2008, to as silsesquioxane
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