Why hybrid porous solids capture greenhouse gases?

Abstract

Hybrid porous solids, with their tunable structures, their multifunctional properties and their numerous applications, are currently topical, particularly in the domain of adsorption and storage of greenhouse gases. Most of the data reported so far concern the performances of these solids in this domain, particularly in terms of adsorbed amounts of gas but do not explain at the atomic level why and how adsorption and storage occur. From a combination of structural, spectroscopic, thermodynamic experiments and of molecular simulations, this tutorial review proposes answers to these open questions with a special emphasis on CO(2) and CH(4) storage by some rigid and flexible hybrid porous materials.

Charge-Controlled Switchable CO2 Capture on Boron Nitride Nanomaterials

“…The charge transfer between the BNNT and CO 2 is negligible with a value of only 0.002e -. We also investigated CO 2 adsorption on BN sheets comprised of different sized unit cells (from 6 × 6 to 10 × 10) and BNNTs with different diameters (from (6,6) to (10,10)) and found that CO 2 can only form weak interactions with these BN nanomaterials when they are in their neutral states.…”

“…Table S2 and S3 list the important structural and energetic properties of CO 2 adsorption on the BN absorbents with different sizes and structures, including bond distances, bond angles, and electron transfer (e -) from BN sheet/NTs to CO 2 as well as their adsorption energies. Figure 6 shows the adsorption energies of CO 2 (5, 5), (6,6) and (7, 7), respectively. We can see that with an increase of the BN sheet unit cell from 5 × 5 to 8 × 8 and BN diameters from (5, 5) to (7,7), the adsorption energies, the charge transfer and the interactions between CO 2 and BN sheets/BNT decrease gradually.…”

“…4,5 The current industrial process for CO 2 capture is based on the use of aqueous amine solutions or chilled ammonia, which suffers from relatively low efficiency and issues such as equipment corrosion, solvent loss, and toxicity. 6 To overcome such disadvantages, solid materials such as metal-organic frameworks (MOFs), carbon and non-carbon nanotubes have been proposed as attractive adsorbents for CO 2 capture [6][7][8][9] . However a regeneration step in the process of CO 2 adsorption/desorption is required generally requiring high temperature to release CO 2 .…”

Quasi‐Polymeric Metal–Organic Framework UiO‐66/g‐C3N4 Heterojunctions for Enhanced Photocatalytic Hydrogen Evolution under Visible Light Irradiation

“…[8][9][10][11] Like metal oxide semiconductors, MOFs can also be photoexcited to produce electron-hole pairs. In metal oxides, the metal ions are linked by the O 2− ions.…”

Summary Report on the Volatile Radionuclide and Immobilization Research for FY2011 at PNNL

“…These metal centers and organic linkers readily self-assemble into materials with open framework structures, where all the porosity is accessible for gas storage, separation, and catalysis (Férey et al 2011;Lee et al 2009;Li et al 2009). MOFs have received considerable attention over the past few years because of their high surface areas, large and tailorable pores, and adjustable chemical functionalities (Li et al 1999;Rowsell et al 2005;Thallapally et al 2008).…”