Preparation of the Na₂CO₃–Carbon Nanocomposite and Its CO₂ Capture

Abstract

A Na2CO3–carbon nanocomposite (NaC-NC) was prepared from terephthalic acid and NaOH, and its CO2 capture under moist conditions was examined by thermogravimetric analysis and X-ray diffraction. CO2 capture was repeated twice. The first CO2 capture reaction of bulk Na2CO3 was faster than its second, while the second capture reaction of NaC-NC was faster than its first. This may be because of the nanostructural properties of NaC-NC. The regeneration from NaHCO3 to Na2CO3 of NaC-NC proceeded at a lower temperature than with the bulk NaHCO3. Thus, compared with the bulk Na2CO3, we found that NaC-NC could efficiently capture CO2, increasing the reaction rate and decreasing the regeneration temperature.

CO2 Capture by a K2CO3–Carbon Composite under Moist Conditions

“…Kinetic data for CO 2 capture were obtained from the time course of the CO 2 capture shown in Figure . For a total KC-CC mass of m t (g·CO 2 ·g –1 ) at time t and a saturated mass of m e (g·CO 2 ·g –1 ) after equilibration, the kinetic parameters were analyzed using pseudo-first-order equations: where k is a pseudo-first-order rate constant (min –1 ). The plot for the model is shown in Figure .…”

“…One possibility is to fabricate nanostructured sorbents to obtain higher activity. A Na 2 CO 3 –carbon composite and a K 2 CO 3 -carbon composite were prepared for this purpose and exhibited better performance than bulk Na 2 CO 3 and K 2 CO 3 for CO 2 capture and regeneration. , However, the K 2 CO 3 –carbon composite, which was prepared by impregnating K 2 CO 3 into mesopores of carbon aerogel, did not improve the CO 2 capture ability compared to the results obtained for the Na 2 CO 3 –carbon composite, which was prepared from terephthalic acid and NaOH.…”

“…In the present study, to obtain a novel material with high energy efficiency as a CO 2 sorbent, a K 2 CO 3 −carbon composite was prepared from terephthalic acid and KOH, 17 and the CO 2 capture properties of the obtained substance were studied under moist conditions. This research focuses on the development of new methods for improving the CO 2 capacity, reaction rate, and regeneration temperature in comparison to those for bulk K 2 CO 3 .…”

Sodium Carbonate–Carbon Hybrid Material for Low-Energy-Consuming CO2 Capture

“…Meanwhile, carbon materials with porous structures and good pore connectivity have various excellent properties including low density, structural stability, hydrophobicity, and a large specific surface area. If used as a skeleton, they can eliminate the effects of sintering and agglomeration of Na 2 CO 3 particles. − Nasiman and Kanoh reported that sodium terephthalate produced by neutralization can obtain a Na 2 CO 3 –carbon nanocomposite after carbonization at 873 K with a CO 2 capture capacity of 5.2 mmol/g (230 mg–CO 2 ·g –1 ). However, they did not examine the effect of the carbonization temperature on the CO 2 capture capacity, capture rate, or regeneration temperature.…”