Dataset Information

Parametrical Study on CO₂ Capture from Ambient Air Using Hydrated K₂CO₃ Supported on an Activated Carbon Honeycomb.

ABSTRACT: Potassium carbonate is a highly hygroscopic salt, and this aspect becomes important for CO₂ capture from ambient air. Moreover, CO₂ capture from ambient air requires adsorbents with a very low pressure drop. In the present work an activated carbon honeycomb monolith was coated with K₂CO₃, and it was treated with moist N₂ to hydrate it. Its CO₂ capture capacity was studied as a function of the temperature, the water content of the air, and the air flow rate, following a factorial design of experiments. It was found that the water vapor content in the air had the largest influence on the CO₂ adsorption capacity. Moreover, the deliquescent character of K₂CO₃ led to the formation of an aqueous solution in the pores of the carrier, which regulated the temperature of the CO₂ adsorption. The transition between the anhydrous and the hydrated forms of potassium carbonate was studied by means of FT-IR spectroscopy. It can be concluded that hydrated potassium carbonate is a promising and cheap alternative for CO₂ capture from ambient air for the production of CO₂-enriched air or for the synthesis of solar fuels, such as methanol.

SUBMITTER: Rodriguez-Mosqueda R

PROVIDER: S-EPMC6046220 | biostudies-literature | 2018 Mar

REPOSITORIES: biostudies-literature

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Parametrical Study on CO2 Capture from Ambient Air Using Hydrated K2CO3 Supported on an Activated Carbon Honeycomb.

Rodríguez-Mosqueda Rafael R Bramer Eddy A EA Roestenberg Timo T Brem Gerrit G

Industrial & engineering chemistry research 20180228 10

Potassium carbonate is a highly hygroscopic salt, and this aspect becomes important for CO2 capture from ambient air. Moreover, CO2 capture from ambient air requires adsorbents with a very low pressure drop. In the present work an activated carbon honeycomb monolith was coated with K2CO3, and it was treated with moist N2 to hydrate it. Its CO2 capture capacity was studied as a function of the temperature, the water content of the ...[more]

PMID: 30022804

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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

Parametrical Study on CO₂ Capture from Ambient Air Using Hydrated K₂CO₃ Supported on an Activated Carbon Honeycomb.

Publications

Parametrical Study on CO<sub>2</sub> Capture from Ambient Air Using Hydrated K<sub>2</sub>CO<sub>3</sub> Supported on an Activated Carbon Honeycomb.

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