Intercalation and Retention of Carbon Dioxide in a Smectite Clay promoted by Interlayer Cations
Author
Summary, in English
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 Li1, Na1 or Ni21. Interestingly, we observe that the smectite Li-fluorohectorite is
able to retain CO2 up to a temperature of 356C 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.
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 Li1, Na1 or Ni21. Interestingly, we observe that the smectite Li-fluorohectorite is
able to retain CO2 up to a temperature of 356C 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/s
Publishing year
2015
Language
English
Publication/Series
Scientific Reports
Volume
5
Full text
Document type
Journal article
Publisher
Nature Publishing Group
Topic
- Natural Sciences
- Physical Sciences
Status
Published
ISBN/ISSN/Other
- ISSN: 2045-2322