%0 Online Multimedia
%A Lee, Hanyeong
%A Triviño, Monica Louise T.
%A Hwang, Soonha
%A Kwon, Sung Hyun
%A Lee, Seung Geol
%A Moon, Jun Hyuk
%A Yoo, Jungho
%A Seo, Jeong Gil
%D 2017
%T In
Situ Observation of Carbon Dioxide Capture on Pseudo-Liquid Eutectic
Mixture-Promoted Magnesium Oxide
%U https://acs.figshare.com/articles/media/In_Situ_Observation_of_Carbon_Dioxide_Capture_on_Pseudo-Liquid_Eutectic_Mixture-Promoted_Magnesium_Oxide/5768235
%R 10.1021/acsami.7b14256.s003
%2 https://acs.figshare.com/ndownloader/files/10164510
%K Carbon Dioxide Capture
%K MgO
%K TEM
%K MgCO 3
%K sorption
%K MgCO 3 saturation
%K Pseudo-Liquid Eutectic Mixture-Promoted Magnesium Oxide Eutectic mixtures
%K EM
%K KNO
%K KLM
%K transmission electron microscopy
%K CO 2
%K sorbent
%K rearrangement
%X Eutectic
mixtures of alkali nitrates are known to increase the sorption capacity
and kinetics of MgO-based sorbents. Underlying principles and mechanisms
for CO2 capture on such sorbents have already been established;
however, real-time observation of the system was not yet accomplished.
In this work, we present the direct-observation of the CO2 capture phenomenon on a KNO3–LiNO3 eutectic
mixture (EM)-promoted MgO sample, denoted as KLM, via in situ transmission
electron microscopy (in situ TEM). Results revealed that the pseudoliquid
EM undergoes structural rearrangement as MgCO3 evolves
from the surface of MgO, resulting in surface roughening and evolution
of cloudy structures that stay finely distributed after regeneration.
From this, we propose a nucleation and structural rearrangement scheme
for MgCO3 and EM, which involves the rearrangement of bulk
EM to evenly distributed EM clusters due to MgCO3 saturation
as adsorption proceeds. We also conducted studies on the interface
between EM over solid MgO and MgCO3 formed during sorption,
which further clarifies the interaction between MgO and EM. This study
provides better insight into the sorption and regeneration mechanism,
as well as the structural rearrangements involved in EM-promoted sorbents
by basing not only on intrinsic evolutions but also on real-time
observation of the system as a whole.
%I ACS Publications