Activated three-dimensionally ordered micromesoporous carbons for CO2 capture

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985891%3A_____%2F23%3A00575206" target="_blank" >RIV/67985891:_____/23:00575206 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11320/23:10468889

Výsledek na webu

<a href="https://doi.org/10.1016/j.mtsust.2023.100509" target="_blank" >https://doi.org/10.1016/j.mtsust.2023.100509</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.mtsust.2023.100509" target="_blank" >10.1016/j.mtsust.2023.100509</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Activated three-dimensionally ordered micromesoporous carbons for CO2 capture

Popis výsledku v původním jazyce

Three-dimensionally ordered micromesoporous carbon (3DOmm) has been studied recently as a potential sorbent for CO2 capture at higher pressures. However, the as-synthesized material usually has a low microporous fraction, which could significantly limit CO2 uptake. Herein, we showed that microporosity in 3DOmm carbon can be increased by physical activation, substantially improving its CO2 capture performance in the wide pressure range. The highly porous activated 3DOmm carbons, having amorphous structure, were prepared with ordered spherical mesopores of diameter 22.7-24.7 nm and ultramicropores in the walls of diameter 0.41-0.55 nm. Physical activation was performed by exposing the post-synthesized 3DOmm carbon to high temperatures of 973-1173 K under a CO2 flow for 30 mins. The activation procedure did not show any visible destruction of the ordered mesoporous structure in the 3DOmm carbon. However, it had a significant impact on micropore and mesopore volumes and the specific surface area, which in turn affected the CO2 adsorption capacity of the carbons. Accordingly, after activation at 973 K, the micropore volume of 0.23 cm3 g-1, the mesopore volume of 3.70 cm3 g-1 and the specific surface area of 1058 m2 g-1 in the 3DOmm carbon increased to 0.27 cm3 g-1, 3.94 cm3 g-1 and 1462 m2 g-1, respectively. Further increase in activation temperature led to decreasing pore values due to widening and shrinking of the thin carbon walls in the 3DOmm carbon. The 3DOmm carbon activated at 973 K had the highest micropore and mesopore volumes and the highest CO2 adsorption performance over the whole pressure range (3.19 mmol g-1 at 273 K and 100 kPa, 11.18 mmol g-1 at 298 K and 2 MPa and 0.38 mmol g-1 under flue 15% CO2/85% N2 gas conditions at 298 K). All 3DOmm carbons showed fast kinetics, high selectivity for CO2 over N2 (33.2-51.5), the excellent regenerative ability and isosteric heats (18.9-29.2 kJ mol-1), indicating physical adsorption.

Název v anglickém jazyce

Activated three-dimensionally ordered micromesoporous carbons for CO2 capture

Popis výsledku anglicky

Three-dimensionally ordered micromesoporous carbon (3DOmm) has been studied recently as a potential sorbent for CO2 capture at higher pressures. However, the as-synthesized material usually has a low microporous fraction, which could significantly limit CO2 uptake. Herein, we showed that microporosity in 3DOmm carbon can be increased by physical activation, substantially improving its CO2 capture performance in the wide pressure range. The highly porous activated 3DOmm carbons, having amorphous structure, were prepared with ordered spherical mesopores of diameter 22.7-24.7 nm and ultramicropores in the walls of diameter 0.41-0.55 nm. Physical activation was performed by exposing the post-synthesized 3DOmm carbon to high temperatures of 973-1173 K under a CO2 flow for 30 mins. The activation procedure did not show any visible destruction of the ordered mesoporous structure in the 3DOmm carbon. However, it had a significant impact on micropore and mesopore volumes and the specific surface area, which in turn affected the CO2 adsorption capacity of the carbons. Accordingly, after activation at 973 K, the micropore volume of 0.23 cm3 g-1, the mesopore volume of 3.70 cm3 g-1 and the specific surface area of 1058 m2 g-1 in the 3DOmm carbon increased to 0.27 cm3 g-1, 3.94 cm3 g-1 and 1462 m2 g-1, respectively. Further increase in activation temperature led to decreasing pore values due to widening and shrinking of the thin carbon walls in the 3DOmm carbon. The 3DOmm carbon activated at 973 K had the highest micropore and mesopore volumes and the highest CO2 adsorption performance over the whole pressure range (3.19 mmol g-1 at 273 K and 100 kPa, 11.18 mmol g-1 at 298 K and 2 MPa and 0.38 mmol g-1 under flue 15% CO2/85% N2 gas conditions at 298 K). All 3DOmm carbons showed fast kinetics, high selectivity for CO2 over N2 (33.2-51.5), the excellent regenerative ability and isosteric heats (18.9-29.2 kJ mol-1), indicating physical adsorption.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10511 - Environmental sciences (social aspects to be 5.7)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Materials Today Sustainability

ISSN

2589-2347

e-ISSN

2589-2347

Svazek periodika

24

Číslo periodika v rámci svazku

DEC

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

15

Strana od-do

100509

Kód UT WoS článku

001073942300001

EID výsledku v databázi Scopus

2-s2.0-85169908078