Dataset Information

Direct CO2 Capture from Air via Crystallization with a Trichelating Iminoguanidine Ligand.

ABSTRACT: Effectively reducing the concentration of CO2 in ambient air is essential to mitigate global warming. Existing carbon capture and storage technology can only slow down the carbon emissions of large point sources but cannot treat the already accumulated CO2 in the environment. Herein, we demonstrated a simple direct CO2 capture method from air via reactive crystallization with a new trichelating iminoguanidine ligand (BTIG). It could strongly bind CO2 to form insoluble carbonate crystals that could be easily isolated. In the crystal, CO2 was transformed to CO3 2- and trapped in a dense hydrogen bonding network in terms of carbonate-water clusters. This capture process was reversible, and the BTIG ligand could be regenerated by heating the BTIG-CO2 crystal at a mild temperature, which was much lower than the decomposition temperature of CaCO3 (?900 °C). Thermodynamic and kinetics analyses indicate that the crystallization process was exothermic with an enthalpy of -292 kJ/mol, and the decomposition energy consumption was 169 kJ per mol CO2. In addition, BTIG could also be employed for CO2 capture from flue gas with a capacity of 1.46 mol/mol, which was superior to that of most of the reported sorbents.

SUBMITTER: Cai H

PROVIDER: S-EPMC7439369 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature

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Direct CO2 Capture from Air via Crystallization with a Trichelating Iminoguanidine Ligand.

Cai He H Zhang Xingwang X Lei Lecheng L Xiao Chengliang C

ACS omega 20200806 32

Effectively reducing the concentration of CO2 in ambient air is essential to mitigate global warming. Existing carbon capture and storage technology can only slow down the carbon emissions of large point sources but cannot treat the already accumulated CO2 in the environment. Herein, we demonstrated a simple direct CO2 capture method from air via reactive crystallization with a new trichelating iminoguanidine ligand (BTIG). It could strongly bind CO2 t ...[more]

PMID: 32832796

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Project description:Rising CO2 emissions are responsible for increasing global temperatures causing climate change. Significant efforts are underway to develop amine-based sorbents to directly capture CO2 from air (called direct air capture (DAC)) to combat the effects of climate change. However, the sorbents' performances have usually been evaluated at ambient temperatures (25 °C) or higher, most often under dry conditions. A significant portion of the natural environment where DAC plants can be deployed experiences temperatures below 25 °C, and ambient air always contains some humidity. In this study, we assess the CO2 adsorption behavior of amine (poly(ethyleneimine) (PEI) and tetraethylenepentamine (TEPA)) impregnated into porous alumina at ambient (25 °C) and cold temperatures (-20 °C) under dry and humid conditions. CO2 adsorption capacities at 25 °C and 400 ppm CO2 are highest for 40 wt% TEPA-incorporated γ-Al2O3 samples (1.8 mmol CO2/g sorbent), while 40 wt % PEI-impregnated γ-Al2O3 samples exhibit moderate uptakes (0.9 mmol g-1). CO2 capacities for both PEI- and TEPA-incorporated γ-Al2O3 samples decrease with decreasing amine content and temperatures. The 40 and 20 wt % TEPA sorbents show the best performance at -20 °C under dry conditions (1.6 and 1.1 mmol g-1, respectively). Both the TEPA samples also exhibit stable and high working capacities (0.9 and 1.2 mmol g-1) across 10 cycles of adsorption-desorption (adsorption at -20 °C and desorption conducted at 60 °C). Introducing moisture (70% RH at -20 and 25 °C) improves the CO2 capacity of the amine-impregnated sorbents at both temperatures. The 40 wt% PEI, 40 wt % TEPA, and 20 wt% TEPA samples show good CO2 uptakes at both temperatures. The results presented here indicate that γ-Al2O3 impregnated with PEI and TEPA are potential materials for DAC at ambient and cold conditions, with further opportunities to optimize these materials for the scalable deployment of DAC plants at different environmental conditions.

Dataset Information

Direct CO2 Capture from Air via Crystallization with a Trichelating Iminoguanidine Ligand.

Publications

Direct CO<sub>2</sub> Capture from Air via Crystallization with a Trichelating Iminoguanidine Ligand.

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