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Clay membranes to remove CO2 from factory exhaust fumes
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A clay and polymer-based membrane material developed by researchers in China may be the key to efficient separation of carbon dioxide from industrial exhaust.
Taking CO2 out of exhaust pumped out by factories can reduce the level of harmful greenhouse gases entering the environment, but its removal can be energy intensive. Using a selective membrane made of a porous material, such as clay, can make the process more efficient.
A team including researchers from the Collaborative Innovation Center of Chemical Science and Engineering in Tianjin, China, have developed a multilayered membrane material, based on polymers and a special type of clay called montmorillonite, for selective CO2 separation.
The channels created in the material contain OH groups that interact with CO2, making it much easier for the compound to pass through the membrane at high speeds and separate from other gases in exhaust mixtures.
Removing CO2from gas mixtures is also important in the production of natural gas for technical applications, where it is seen as an impurity.
- Angewandte Chemie 128, 9467–9471 (2016). doi: 10.1002/anie.201603211