CO₂ Capture from Air Using Amine‐Functionalized Kaolin‐Based Zeolites

Abstract

Dedicated to Professor Rüdiger Lange on the occasion of his 65th birthdaySeveral inexpensive zeolites such as ZSM-5 (MFI), zeolite Y (FAU), and SAPO-34 (CHA) were developed from kaolin clay and applied for CO 2 capture from air. These molecular sieves were functionalized with tetraethylenepentamine (TEPA) in order to further improve their CO 2 capacity. The obtained kaolin-based zeolites exhibited similar properties than those of zeolites prepared with other sources. They also revealed a bimodal pore network consisting of both micropores and mesopores. The effect of amine loading on CO 2 capture was investigated and the results demonstrated that TEPA-modified zeolite Y with 10 wt % TEPA had a higher capacity than other zeolites due to its larger mesopore volume. The presence of mesopores in the zeolite Y framework facilitated a better accessibility of CO 2 molecules to the amine sites.

CO2 Adsorption of Materials Synthesized from Clay Minerals: A Review

“…The adsorption data revealed that the CO 2 capture diminished for those zeolites with lower pore volume after their impregnation (ZSM-5 and SAPO-34). However, zeolites with bigger channels increased the CO 2 adsorption from 40 mg CO 2 /g to 50 mg CO 2 /g [63].…”

“…On the other hand, kaolinite has been also used as a starting material to obtain a microporous Y-zeolite, obtaining zeolite with a high CO 2 adsorption capacity (138 mg CO 2 /g at 0 • C and a pressure of 1 bar) [62]. In the same way, Thakkar et al (2017) [63] synthesized several zeolites from kaolinite, reaching a CO 2 adsorption of 13 mg CO 2 /g for ZSM-5, 40 mg CO 2 /g for Y-zeolite and 26 mg CO 2 /g for SAPO-34.…”

A review of N-functionalized solid adsorbents for post-combustion CO2 capture

“…Microwave heating was employed for the desorption process, and the fastest desorption time was 9 min for 70% EDA loaded ZSM-5. To further reduce the cost of adsorbents, Thakkar et al [171] prepared ZSM-5, zeolite-Y(ZY) and SAPO-34 from kaolin clay and modified them with TEPA for capturing CO2 from air. The best adsorption capacity was 1.12 mmol/g-sorbent for the TEPA-loaded ZY at 25 °C using 5000 ppm CO2 in nitrogen.…”

Design, synthesis, and physicochemical study of a biomass-derived CO2 sorbent 2,5-furan-bis(iminoguanidine)

“…The MOFs are highly porous materials constructed by metal cations and organic ligands which have large surface areas and can effectively trap carbon dioxide in the cages ( Boyd et al., 2019 ; Trickett et al., 2017 ; González-Zamora and Ibarra, 2017 ). Solid-supported amine-based sorbents are solid adsorbents which incorporate amine moieties into solid supports including zeolites, carbons and organic resins, etc ( Thakkar et al., 2017 ; Pang et al., 2017 ; Holewinski et al., 2017 ; Sarazen and Jones, 2017 ). These adsorbents offer advantages such as high selectivity for CO 2 and relatively low cost, but they displayed lower CO 2 capacities compared to other sorbents.…”