Abstract
The article reports preparation and characterization of CO2 sorbents based on hyperbranched polyglycerol containing trimethylammonium hydroxide groups (Amm-HBPG(OH)). The influence of humidity and ...
Highlights
Carbon dioxide (CO2) is an important greenhouse gas, which is released through natural processes as well as human activities
In the case of humidity swing, the absorption and desorption times were on comparable levels
The capability of the CO2 sorbent to be used in real-life systems depends on many factors
Summary
Carbon dioxide (CO2) is an important greenhouse gas, which is released through natural processes as well as human activities. There have been reports of polymers containing ammonium moieties being used for this purpose They allow for selective absorption of CO2 from the atmosphere and are attractive because of the ability to control the process of capture and release on the principle of changes of humidity.[22] Usually, they consist of porous supports with immobilized quaternary ammonium cations with hydroxide, bicarbonate, or carbonate counteranions. The sorbent-containing tube was charged with a source gas containing carbon dioxide in the range of concentrations from 0 to 450 ppm and 0−95% relative humidity flowing through a thermostated (20 °C) copper coil. Desorption was performed by heating the fumed silica-based sorbent-containing tube to 90 °C and passing a flow of air (700 mL/min) through it. Figure 1. 1H NMR (D2O, 400 MHz) spectrum of the Amm-HBPG copolymer (chloride and hydroxide forms)
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