Subject Fabrication of siliceous chabazite (CHA) zeolite membranes by secondary growth (Korea Univ, Jung Kyu Choi)
Name KCRC Date 2015-03-31 Hit 1005

□ Overview

• A so-called CHA seed layer can be achieved by using a selective deposition of thin plate-like CHA particles.

• Secondary growth of the CHA seed layer can lead to the formation of continuous CHA membranes, which are supposed to separate CO2/N2 based on their size difference.


□ Background

• In general, zeolites have been used in many applications including catalysis, separation, water softening, and adsorption. Especially, the rigid molecular-sized pore structures in zeolites make them appropriate for separating gas molecules via the recognition the minute difference in their shapes and/or sizes.


□ Limitation of Conventional Technologies

• Wide size distributions and various shapes of zeolites prevent the formation of a uniform layer, which is critical in obtaining less-defective, continuous membranes of high quality in the secondary growth methodology.


□ The Advatage of our Technology

• Although plate-like Chabazite (CHA) particles existed in a minor portion compared to near cubic CHA counterparts, a uniform layer, mainly composed of the plate-like CHA particles, could be selectively manufactured, while achieving a high out-of-plane orientation.


□ Technical Performance and Applications

• 350 GPU and CO2/N2 separation factor of 10
• Applicable to CO2 separations in the flue gas stream from coal-fired power plants or in the nature gas resources. In addition, this method can be used for dyesensitized solar cells, chemical sensors, and insulating layers.



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