With the goal of promoting the implementation of carbon capture in both power and industrial sectors, new sorbents must be developed to meet a wide range of process parameters, while keeping a high selectivity and a low energy intensity. One of the materials currently being used for carbon capture is calcium hydroxide (Ca(OH)2), which is a low-cost material with a well-known chemistry that can selectively chemisorb carbon dioxide from post-combustion gases. However, the high binding energy between this sorbent and the CO2 requires a desorption temperature of over 800oC. Recently, we conducted density functional theory (DFT) calculations and force-field molecular dynamics (MD) simulations to assess the viability of monolayer crystalline Ca(OH)2 (portlandene) as an efficient sorbent, where the results showed that it could be used to physisorb CO2/CO selectively from syngas over a wide range of temperatures. This physisorption process, would require a much lower temperature of desorption, which translates into a much lower regeneration energy. However, the high reactivity of Ca(OH)2 with CO2 poses a challenge for the synthesis of pure portlandene. Here, we investigate the effects of ionic exchange in Ca(OH)2 on the ability to exfoliate the layered material and its subsequent selective reactivity with the atmospheric gases. In particular, we explore CaFe- and CaAl-layered double hydroxides (LDHs) with different ratios of ionic exchange. Field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD) are used to characterize the synthesized materials and thermogravimetric analysis coupled with Fourier transform infrared spectroscopy (TGA/FTIR) are used to evaluate their CO2 capture properties.

Synthesis and characterization of CaFe-LDH and CaAl-LDH for CO2 physisorption

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.