Natural Calcium‐Based Sorbents Doped with Sea Salt for Cyclic CO₂ Capture

Abstract

The calcium‐looping process for post‐combustion carbon dioxide capture, an economically and technically feasible method suitable for large‐scale use, has recently gained much attention. However, the capture capacity of calcium‐based sorbents rapidly decreases after only a few cycles. Herein, calcium‐based sorbents with enhanced cyclic CO2‐capture capacity have been derived from cheap, natural raw materials by using a simple impregnation method. Limestone and shells were used as the calcium‐based raw materials, with sea salt as dopant. Modified limestone had the highest CO2‐capture capacity after multiple carbonation‐calcination cycles. Sea‐salt‐doped sorbent showed a relatively stable porous surface during cycles, which resulted in a higher CO2‐capture capacity.

Investigation of Pore-Formers to Modify Extrusion-Spheronized CaO-Based Pellets for CO2 Capture

“…As a result, partial sorbent will be lost and cannot be used repeatedly and economically. Although tremendous efforts have been made in improving the capacity and stability of sorbents [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30], these materials still face the problem that powders are too small and must be produced in the form of pellets before they can be practically applied in CaL [14,31].…”

Increasing Porosity of Molded Calcium‐Based Sorbents by Glucose Templating for Cyclic CO2 Capture

“…Consequently, CO 2 capture, utilization, and storage has obtained increasing attention to reduce CO 2 emissions, and diverse scenarios were proposed and researched recently . Among them, as for the advantages of high adsorption capacity and low cost of the raw sorbent materials, calcium looping (CaL) is considered as one of the most promising technologies . The mechanism of CaL mainly lies in the carbonation/decarbonation cycles of CaO‐based sorbents through the reversible reaction according to Eq.…”

CaCO3–Polymer Nanocomposite Prepared with Supercritical CO2

“…These substances are eventually returned to the natural environment and are transformed into resources such as limestone and phosphate ores [2]. In addition, living organisms also serve as sources of materials, such as wood and tree lacquers, that can be used and reused by humans over the course of many centuries [3].…”