Nanoclay-Based Solid Sorbents for CO₂ Capture

Abstract

A solid sorbent for carbon dioxide capture was developed on the basis of montmorillonite nanoclay, which is a low-cost and easily available bulk material. This high specific surface area, platelet-like nanoclay with hydroxyl groups on edges was treated with aminopropyltrimethoxysilane and polyethylenimine to provide sites for CO2 capture. CO2 sorption tests showed fast kinetics and capture capacities as high as 7.5 wt % at atmospheric pressure and about 17 wt % at 2.07 MPa pressure in the temperature range of 75–85 °C. The regeneration of these nanoclays can be achieved using nitrogen at 100 °C or CO2 (dry or humid) at 155 °C as the sweep gases. Furthermore, pressure swing operation, employing vacuum at 85 °C, is also effective in regenerating the sorbent. This work shows that amine-modified montmorillonite nanoclay has the potential to provide a high-performing solid sorbent for CO2 capture.

Modified nanosepiolite as an inexpensive support of tetraethylenepentamine for CO2 sorption

“…Therefore, developing alternative materials as supporting materials with low cost and good hydrothermal stability such as clays is valuable for industrial application. To the best of our knowledge, few authors recently have studied clay minerals such as bentonite, montmorillonite, and kaolinite as supporting materials for CO 2 capture [12,[28][29][30].…”

Polyethylenimine Applications in Carbon Dioxide Capture and Separation: From Theoretical Study to Experimental Work

“…In addition to different silica materials, CNTs, TNTs, and membranes, many researchers loaded PEI onto or directly synthesized it into other various materials, such as mesoporous alumina, bentonite, clay, activated carbon, fly ash, layered silicate, mesoporous carbon, mesoporous sponge‐like TUD‐1, MOFs, nanofibrillated cellulose, porous chitosan beads, resin, glass fiber, polypropylene fiber, polyamide imide hollow fiber, ZSM‐5 zeolite, and ZIF‐8 . The CO 2 capture performances of other materials functionalized with PEI are demonstrated in Table .…”

Advances in Porous Adsorbents for CO2 Capture and Storage

“…CO 2 sorption increases with decreasing temperature while the high pressure sorption properties demonstrate weak temperature dependence. Elliot A. Roth and coworkers synthesized amine-containing solid sorbent for CO 2 capture through the modification of the surface of montmorillonite nanoclay using aminopropyltrimethoxysilane and polyethylenimine [71]. They found that in pure CO 2 and 10% CO 2 in nitrogen gas streams the nanoclay loaded with only one of the amines exhibits ~6 wt% capture efficacy at 85°C and atmospheric pressure, whereas it is ~7.5 wt% CO 2 capture efficiency when the nanoclay immobilized with both the amines.…”