Enhancement in CO₂ Adsorption on Hydrotalcite-based Material by Novel Carbon Support Combined with K₂CO₃ Impregnation

Abstract

In recent years, a great deal of interest has been shown for high-temperature adsorption of CO 2 on hydrotalcitelike compounds (HTlcs). Numerous efforts have been undertaken to enhance the CO 2 capture property of HTlcs, including alkali-metal impregnation, use of support materials, and modification of chemical composition. The present work demonstrates the applicability of coal-derived graphitic material (CGM) as an effective support for neat as well as K 2 CO 3 -promoted Mg−Al HTlc, enhancing the CO 2 adsorption capacity. Both surface area and basic site density affect the adsorption capacity. The K 2 CO 3promoted CGM-supported Mg−Al HTlc exhibited a fresh adsorption capacity of 1.10 mmol g −1 at 300 °C under a total pressure of 1 bar. After the initial drop, it maintained an average working capacity of 0.42 mmol g −1 during nine cycles of adsorption− desorption in the temperature range of 300−400 °C. The Yoon−Nelson kinetic model fit well with the experimental data.

Molten salts-modified MgO-based adsorbents for intermediate-temperature CO2 capture: A review

“…Since the main active component of the layered double hydroxide (LDH)-based CO 2 adsorbent is also MgO [49][50][51][52] , much work has also been performed on the modification of MgO-based mixed oxides adsorbents derived from LDHs with molten salts, as listed in http://engine.scichina.com/doi/10.1016/j.jechem.2017.06.005 [53][54][55][56][57][58] . In 2013, Li et al .…”

Global Warming and Technologies for Carbon Capture and Storage

“…(Espinal and Morreale, 2012). The adsorption of CO2 on solid materials works through weak physisorption or chemisorption interaction and is mostly employed in cyclic, multi-module processes of adsorption and desorption in which desorption is induced by pressure or temperature swing (Choi et al, 2009) Activated carbons, alkaline earth metal-oxides, hydrotalcites, (Bhatta et al, 2015) supported amines, (Shakerian et al, 2015;Yu et al, 2012) zeolites, (Krishna and van Baten, 2010). Covalent Organic Frameworks (COFs) (Diaz and Corma, 2016;Olajire, 2017) as well as MOFs (Zhou et al 2012;Sabouni et al, 2014;Verdegaal et al, 2016) are all examples of this class of adsorbents (Li et al, 2017;Sumida et al, 2012) Activated carbons have been reported to have a CO2 uptake of 4 mmol/g and a selectivity of CO2/N2 near 10 at room temperature and 1 bar (Berlier and Frère, 1996).…”

A Review of Layered Double Hydroxides as Intermediate-temperature CO2 Adsorbents

“…Adsorption capacity of LDH could be enhanced by composite with porous supporting materials such as zeolites, activated carbon and Mesoporous silica. Bhatta et al [31] reported that in order to improve the adsorption capacity of LDH and keep the best reaction temperature, they found a kind of coal based porous carbon material, which was an economical natural source of carbon. Pramod et al [32] synthesized LDH-SBA-15 composite materials, which were mesoporous, versatile, eco-friendly and repeatable CO 2 capture materials.…”