One-pot generation of mesoporous carbon supported nanocrystalline calcium oxides capable of efficient CO2 capture over a wide range of temperatures
Literature Information
Na Hao, Gongkui Xiao, Liying Liu, Paul Webley
Ordered mesoporous carbon-supported calcium oxide materials have been rationally synthesized for the first time. Large specific surface area, high content of nanosized calcium oxides can be easily obtained and tuned. The structure, porosity and the particle size evolution as a function of calcium content and carbonization temperature are extensively characterized and well correlated with their CO2 sorption properties. The composite materials are of significance for CO2 physisorption at ambient temperatures with high capacity and selectivity over N2. Meanwhile, the nanocrystalline calcium oxides are highly active for CO2 chemisorption, with tuneable and high CO2 capacity at 200–500 °C. An almost complete initial conversion and fast reaction kinetics at a low temperature (450 °C) and low CO2 pressure can be achieved within minutes. Cyclic stability is also substantially improved due to the confinement effect of the CaO nanoparticles within the mesopores. These materials would be suitable for CO2 separation over a wide range of temperatures.
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