New CaO-based adsorbents prepared by solution combustion and high-energy ball-milling processes for CO2 adsorption: Textural and structural influences

In the present work, new CaO-based adsorbents were obtained by a fast solution combustion method and high-energy ball-milling process to study their CO2 capture behavior under different moderate pressure and temperature conditions. The as-prepared CaO products were characterized systematically using different analytical techniques such as X-ray diffraction, scanning electron microscopy and N2 physisorption measurements. The results showed that the CaO prepared by solution combustion and ball-milled during 2.5 h showed the maximum CO2 adsorption capacity of 9.31 mmol/g at 25 °C and 1 atm mainly via chemisorption with CaCO3 formation, which was corroborated by infrared spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy studies. In general, the obtained results revealed that the synthesized CaO nanopowders from solution combustion that were treated by high-energy ball-milling enhanced their CO2 adsorption capacity due to improved structural and textural properties, and this CaO-based adsorbent can be used as a promising material for CO2 capture in post-combustion CO2 capture technologies on a large scale, under atmospheric pressure and temperature conditions. © 2017 The Authors

Ball-milling process; CaO-based adsorbents; CO2 capture; Solution combustion synthesis; Structural influences; Textural properties Adsorption; Atmospheric pressure; Calcite; Calcium carbonate; Carbon dioxide; Combustion synthesis; Infrared spectroscopy; Milling (machining); Scanning electron microscopy; Tellurium compounds; X ray diffraction; X ray photoelectron spectroscopy; Ball milling process; CO2 capture; Solution combustion synthesis; Structural influences; Textural properties; Ball milling

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