10.1021/la204164q.s001
Henrik Hemmen
Henrik
Hemmen
Erlend G. Rolseth
Erlend G.
Rolseth
Davi M. Fonseca
Davi M.
Fonseca
Elisabeth L. Hansen
Elisabeth L.
Hansen
Jon Otto Fossum
Jon Otto
Fossum
Tomás S. Plivelic
Tomás S.
Plivelic
X-ray Studies of Carbon
Dioxide Intercalation in Na-Fluorohectorite
Clay at Near-Ambient Conditions
American Chemical Society
2012
ambient
CO 2 intercalates
CO 2 intercalation
interlayer repetition distance
2O
clay
intercalation rate
Carbon Dioxide Intercalation
magnitude
2012-01-24 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/X_ray_Studies_of_Carbon_Dioxide_Intercalation_in_Na_Fluorohectorite_Clay_at_Near_Ambient_Conditions/2556655
We show experimentally that gaseous CO<sub>2</sub> intercalates
into the interlayer space of the synthetic smectite clay Na-fluorohectorite
at conditions not too far from ambient. The mean interlayer repetition
distance of the clay when CO<sub>2</sub> is intercalated is found
to be 12.5 Å for the conditions −20 °C and 15 bar.
The magnitude of the expansion of the interlayer upon intercalation
is indistinguishable from that observed in the dehydrated–monohydrated
transition for H<sub>2</sub>O, but the possibility of water intercalation
is ruled out by a careful analysis of the experimental conditions
and repeating the measurements exposing the clay to nitrogen gas.
The dynamics of the process is observed to be dependent on the pressure,
with a higher intercalation rate at increased pressure. The rate of
CO<sub>2</sub> intercalation at the studied conditions is found to
be several orders of magnitude slower than the intercalation rate
of water or humidity at ambient pressure and temperature.