Synthesis and CO2 Absorption Properties of Single-phase Li2CuO2 as a CO2 Absorbent

Abstract

Synthesis and CO2 absorption properties of single-phase Li2CuO2 oxide were studied by X-ray powder diffraction and thermogravimetry. Samples of Li2CuO2 were prepared in solid state using Li2CO3 and CuO as starting reagents. A mixture of Li2CO3 and CuO was heated at temperatures of 600–1000 °C and then quenched to room temperature. From XRD, it was found that single-phase Li2CuO2 can be obtained by heat treatment at 680–685 °C with the quenching operation. The single phase was never obtained without quenching; that is, quenching rate (°C s−1) seems to be an important factor which determinates whether sample is obtained as a single phase or not. From thermogravimetry, it was found that Li2CuO2 begins to absorb CO2 at around 230 °C, then drastically absorbs CO2 at over 600 °C, reaching 40.2 mass % maximum CO2 absorption, and finally emits CO2 over 900 °C. The maximum CO2 absorption (40.2 mass %) is larger than that (36.7 mass %) of Li4SiO4 CO2 absorbent.

Reversible Reaction with CO2 and Control of CO2 Absorption/Desorption Properties of Ba2(Fe1−xInx)2O5 Solid Solutions

“…From this reaction, it is clear that the mass variation of CO 2 absorption increases with increasing x, showing agreement with the results of TG in Fig. 2, it was found that the equilibrium temperature of reaction (3) is lower than those of reactions (1) and (2). Since reaction (3) is reversible, from the results shown in Fig.…”

“…Therefore, it can be concluded that Ba 2 In 2 O 5 reversibly reacts with CO 2 by reaction (2). From Figs.…”

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

“…In this case, the maximum CO 2 chemisorbed was 28.3 wt%, and the thermogram shows the beginning of a CO 2 desorption process. Additionally, the amount of CO 2 captured by the Li 2 CuO 2 ball milled sample under these temperature and pressure conditions in a closed system is substantially higher than those observed in previous studies of Li 2 CuO 2 at atmospheric pressures between 30 and 350 C, [33][34][35][36] where the CO 2 chemical capture was not higher than 0.5 mmol g À1 . Similar results have been obtained in other lithium ceramics once their initial surface areas are improved.…”

“…According to the literature, Li 2 CuO 2 reacts with CO 2 as shown in reaction (1). [33][34][35][36] This sample presented a double chemisorption process, where the supercial and bulk processes were performed between 250 to 450 and 610 to 740 C, respectively. In this case, Fig.…”

Progress in hydrotalcite like compounds and metal-based oxides for CO2 capture: a review

“…These kinds of ceramics have shown to exhibit improved sorbent characteristics (Pfeiffer and Yun-Hang, 2010;Palacios-Romero and Pfeiíer, 2008). Matsukura et al (2010) reported that the single-phase Li 2 CuO 2 , obtained from solid-state reaction could absorb CO 2 equivalent to theoretical capacity (40.2 wt%) in the temperature range of 230e875 C.…”