Zeolite-Based Sorbent for CO₂ Capture: Preparation and Performance Evaluation

Abstract

In this work, zeolite-based sorbents were developed from gasified rice husk. CO2 capture capacity of the sorbents was examined at various temperatures and pressures employing a fixed-bed flow reactor and simulated flue gas. Various physicochemical properties such as thermal stability, pore size distribution, morphology, chemical composition, etc. of the in-house-developed materials were characterized in detail and were also compared with two commercially available zeolites. Tetra-ethylenepentamine was impregnated in the in-house-developed zeolite supports to investigate its suitability to improve the CO2 adsorption capacity. The effects of reactor pressure, temperature, Si/Al ratio, and amine loading on CO2 uptake capacity were examined. A declining trend in CO2 adsorption capacity was observed with the increase in adsorption temperature and amine loading. At 30 °C, zeolite-Y (designated as Z-Y-3, silica to alumina ratio of 2.25) sample exhibited maximum adsorption capacity, and the obtained values were around 114 and 190 mg CO2/g sorbent under atmospheric and 5 bar pressure, respectively. It was also observed that the presence of alkali metal ions influenced the adsorption capacity of the zeolites. The study inferred that the adsorbent was efficient and promising for multiple adsorption–desorption cycles without much deterioration of the capture capacity.

Carbon dioxide adsorption based on porous materials

“…As described above, Y-type zeolites hold a well-dened pore structure and their pore sizes are of the same magnitude as CO 2 molecules, thus projected to give a great affinity for CO 2 adsorption. Murge et al 100 used zeolite-Y (designated as Z-Y-3, silica to alumina ratio of 2.25) with TEPA modication displayed higher CO 2 uptake, and the acquired results were about 114 mg g À1 and 190 mg g À1 for 1 bar and 5 bar pressure, accordingly at 303 K. Wang et al 101 used PEI impregnated mesoporous ZSM-5 zeolite prepared from rice husk ash. The measurement of the CO 2 capture at 393 K revealed that ZSM-5-PEI-30 had a capacity of 1.96 mmol g À1 , which was nearly 5 times more than the pristine.…”

“…As described above, Y-type zeolites hold a well-defined pore structure and their pore sizes are of the same magnitude as CO 2 molecules, thus projected to give a great affinity for CO 2 adsorption. Murge et al 100 used zeolite-Y (designated as Z-Y-3, silica to alumina ratio of 2.25) with TEPA modification displayed higher CO 2 uptake, and the acquired results were about 114 mg g −1 and 190 mg g −1 for 1 bar and 5 bar pressure, accordingly at 303 K.…”

Advances in Post‐Combustion CO2Capture by Physical Adsorption: From Materials Innovation to Separation Practice

“…With decreased Si/Al ratio, the adsorption affinity for CO 2 increases due to strong ion‐quadruple interactions [96] . In addition, FAU zeolites feature a high aluminum content, which, in principle, could enhance the CO 2 absorption capacity and selectivity [97,98] …”

Characterization of Chemisorbed Species and Active Adsorption Sites in Mg–Al Mixed Metal Oxides for High-Temperature CO2 Capture

“… 1 , 2 Capturing CO 2 from industrial emissions is one of the several approaches toward this end. 3 Solid sorbents such as zeolites, 4 metal–organic frameworks (MOFs), 5 , 6 covalent organic frameworks (COFs), 7 mesoporous carbon, 8 and metal oxides 9 have all shown to be promising materials for CO 2 capture. Among the solid CO 2 sorbents, layered double hydroxide (LDH)-derived mixed metal oxides (MMOs) have shown promising CO 2 capture performance at the 200–500 °C temperature range that is associated with industrial emissions such as iron and steel plants.…”