Analysis of the CO₂Chemisorption in Li₅FeO₄, a New High Temperature CO₂Captor Material. Effect of the CO₂and O₂Partial Pressures

Abstract

Pentalithium ferrite (Li 5 FeO 4 ) was tested as possible CO 2 captor, both by theoretical calculations and experimental measurements. The pristine Li 5 FeO 4 compound with orthorhombic structure was synthesized via solid-state reaction and it was structural and microstructurally characterized. Later, sample was heat-treated at temperatures from room temperature to 900 °C under different CO 2 or CO 2 −O 2 atmospheres. Li 5 FeO 4 exhibits excellent CO 2 chemisorption abilities with a capture capacity about 12.9 mmol/g, which is outstanding in comparison to other previously reported ceramic captors. This material is able to react with CO 2 from 200 °C to approximately 715 °C showing a high kinetic of reaction even at CO 2 partial pressure values as low as 0.2. Additionally, results suggest that oxygen addition does enhance the CO 2 chemisorption on Li 5 FeO 4 at temperatures below 700 °C, although oxygen addition seems to favor the desorption process at higher temperatures.

Synthesis of highly effective stabilized CaO sorbents via a sacrificial N-doped carbon nanosheet template

“…4 Alternative approaches involve developing intermediate-temperature and high-temperature sorbents, which can directly trap CO from hot flue gases, and thus reduce the cost of CO 2 capture to more commercially acceptable levels. 5 Numerous types of sorbents including hydrotalcites 6,7 , calcium oxides [8][9][10][11] , and ceramic materials [12][13][14][15] have been studied. Calcium oxides in the form of calcium looping (CL) technology are considered to be one of the most promising candidates among these materials owing to (i) abundant naturally occurring CaO precursors (e.g.…”

Recent advances in lithium containing ceramic based sorbents for high-temperature CO2 capture

“…Similar work has been performed with Li5AlO4, Li2CuO2 and Li5FeO4. 167,170,177 Similar to the thermodynamic oxygen addition effect, different studies have shown that water vapor addition (H2O(v)) modified the CO2 sorption process on lithium ceramics (Li2SiO3, Li4SiO4, Li2CuO2, Li2ZrO3 and Li5AlO4), mainly at low temperatures (T < 100 °C). 128,[183][184][185][186] All these studies show that H2O(v) becomes an active intermediate specie during the CO2 sorption, as it is represented in reaction (16), where Li2CuO2 is used as a lithium ceramic example.…”

Screening and Characterization of Ternary Oxides for High-Temperature Carbon Capture

“…It is clear from the TGA ramp experiments that Li 6 MnO 4 and Li 6 ZnO 4 exhibit a two-stage carbonation behaviour, commonly observed in other materials with a similar chemical composition and structure such as Li 5 AlO 4 , Li 5 FeO 4 , and Li 6 CoO 4 . 11,13,15 This two-stage carbonation features the onset of a small initial mass gain at low temperature around ∼600 K followed by a sharp onset and substantial mass gain initiated between 850 K and 900 K. The low-temperature regime is ascribed to reactions near the surface, whereas the high sorption of CO 2 in the high-temperature regime is ascribed to bulk solid-state reaction, enabled by a sufficiently high rate of ionic transport activated at higher temperatures.…”