Intercalation and Retention of Carbon Dioxide in a Smectite Clay promoted by Interlayer Cations

Abstract

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 Ni2+. 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.

Modelling CO 2 adsorption and separation on experimentally-realized B 40 fullerene

“…There have been extensive studies that demonstrated that solid sorbents with negative charge can display significantly enhanced adsorption of CO 2 [16,28,29]. It is interesting for us to further explore the adsorption of CO 2 on the B 40 fullerene with an extra electron.…”

Supercritical Carbon Dioxide at Smectite Mineral–Water Interfaces: Molecular Dynamics and Adaptive Biasing Force Investigation of CO2/H2O Mixtures Nanoconfined in Na-Montmorillonite

“…[30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][52][53][54][55][56] With respect to confinement of hydrophobic species, the 2-dimensional interlayer galleries of expandable clays are known to accommodate CO 2 . 6,[18][19][20][21]23,26,38,[57][58][59][60][61][62][63][64] Owing to their natural abundance, environmental friendliness, large internal surface areas, and tunable affinity and specificity for adsorption of small and complex molecules, 37-45,53-56 the expandable clay minerals continue to serve as ideal models for understanding the behavior of hydrophilic and hydrophobic species in …”

“…1,6,[18][19][20][21][22][23][24][25][26][27][28][29]38,57,58,60,[64][65][66][67] Because of their common natural occurrence, they may also play an important role in geological CO 2 -sequestration reservoirs. 1,6,[18][19][20][21][22][23][24][25][26][27][28][29]38,67,57,58,60,[64][65][66][67] The affinity and specificity of oxide surfaces for intercalates can be controlled by a variety of compositional and structural parameters including substitutions in the tetrahedral and octahedral layers, variability in charge-balancing cations, and coatings of functionalized organic compounds. [38][39][40]...…”

“…43,[48][49][50][68][69][70][71][72][73] With respect to CO 2 incorporation in smectite interlayer galleries, several recent in situ high-pressure and temperature experimental X-ray diffraction, Infrared (IR), and NMR studies have shown that CO 2 enters the interlayer galleries at supercritical CO 2 -sequestration reservoir conditions and affects the structural environments and dynamics of interlayer cations. [18][19][20][21][22][23][24][25][26][27][28][29]58 For instance, Schaef et. al., 62 estimated the amount of CO 2 in the interlayer of dry sodium montmorillonite (Na-MMT) using quartz crystal microbalance (QCM) measurements while Loring et.…”

Molecular Dynamics Simulations of Carbon Dioxide, Methane, and Their Mixture in Montmorillonite Clay Hydrates

“…Xray diffraction measurements showed negligible expansion for dry clay samples upon exposure to dry CO 2 and that residual water is required to intercalate CO 2 . 1, 21 Exper-4 imental investigations have explored gas sorption on both dry 6,7,[13][14][15]25 and moisture equilibrated 1,7,13,14,17,22,54 clays. In addition, computer simulations have inspected the effect of water on the adsorption of carbon dioxide and methane in clay minerals, and the underlying sorption mechanisms.…”