Intercalation and retention of carbon dioxide in a smectite clay promoted by interlayer cations.
A good material for CO2 capture should possess some specific properties: (i) a large effective surface area with good adsorption capacity, (ii) selectivity for CO2, (iii) regeneration capacity with minimum energy input, allowing reutilization of the material for CO2 adsorption, and (iv) low cost and high environmental friendliness. Smectite clays are layered nanoporous materials that may be good candidates in this context. Here we report experiments which show that gaseous CO2 intercalates into the interlayer nano-space of smectite clay (synthetic fluorohectorite) at conditions close to ambient. The rate of intercalation, as well as the retention ability of CO2 was found to be strongly dependent on the type of the interlayer cation, which in the present case is Li(+), Na(+) or Ni(2+). Interestingly, we observe that the smectite Li-fluorohectorite is able to retain CO2 up to a temperature of 35°C at ambient pressure, and that the captured CO2 can be released by heating above this temperature. Our estimates indicate that smectite clays, even with the standard cations analyzed here, can capture an amount of CO2 comparable to other materials studied in this context.
Department of Physics, Norwegian University of Science and Technology, NTNU. Trondheim, Norway.
L
L
Michels
Department of Physics, Norwegian University of Science and Technology, NTNU. Trondheim, Norway.
J O
JO
Fossum
Department of Physics, Norwegian University of Science and Technology, NTNU. Trondheim, Norway.
Z
Z
Rozynek
Department of Physics, Norwegian University of Science and Technology, NTNU. Trondheim, Norway.
H
H
Hemmen
Department of Physics, Norwegian University of Science and Technology, NTNU. Trondheim, Norway.
K
K
Rustenberg
Physics Department, Institute for Energy Technology, IFE, Kjeller, Norway.
P A
PA
Sobas
Physics Department, Institute for Energy Technology, IFE, Kjeller, Norway.
G N
GN
Kalantzopoulos
1] Department of Physics, Norwegian University of Science and Technology, NTNU. Trondheim, Norway [2] Physics Department, Institute for Energy Technology, IFE, Kjeller, Norway.
K D
KD
Knudsen
Slovak University of Technology, Bratislava, Slovakia.
M
M
Janek
MAX IV Laboratory, Lund University, Lund, Sweden.
T S
TS
Plivelic
Instituto de Física and International Center for Condensed Matter Physics, Universidade de Brasília, Brasília, Brasil.
G J
GJ
da Silva