CO2 chemisorption in Li2CuO2 microstructurally modified by ball milling: study performed with different physicochemical CO2 capture conditions

Abstract

Lithium cuprate (Li₂CuO₂) was obtained by a solid state reaction and a subsequent ball milling process; then, the samples were characterized structurally and microstructurally. Additionally, both the Li₂CuO₂ ball milled and the solid state samples, for comparison purposes, were tested in the CO₂ chemisorption process at moderate and low temperatures under different reaction conditions: (i) at moderate CO₂ pressure and (ii) in the presence of water vapor. In both cases, the textural and microstructural properties of the ball milled Li₂CuO₂ samples showed excellent CO₂ chemisorption properties which are significantly enhanced due to CO₂ pressure effects or the presence of water vapor. All these results were attributed to the textural and morphological changes evidenced in the samples. The observed surface area increments show preponderant effects during CO₂ chemisorption at low and moderate temperatures.