Work

Role of Amine Structures in CO2 Adsorption Performance and Stability of Amine-Modified Bimodal Porous Silica

Year: 2025

Type: article

Abstract: This study provides insights into how various parametersincluding amine type (DETA, TEPA, PEI), amine loading, drying conditions (duration of 0.5 versus 12 h and drying atmosphere of ambient air versus N2 flow), and adsorption temperatureinfluence CO2 capture performance using bimodal porous silica (BS) sorbents. Increasing the drying time from 0.5 to 12 h notably reduced the amine content in DETA-loaded sorbents, had a moderate effect on TEPA-loaded sorbents, and minimally affected PEI-loaded sorbents. Drying under N2 flow accelerated amine loss in DETA-loaded sorbents but slightly improved amine retention in PEI-loaded sorbents. Adsorption kinetics described by the Avrami fractional-order model indicated internal diffusion limitations dependent upon amine type and adsorption temperature with the strongest diffusion constraints occurring in DETA-loaded sorbents, while PEI-loaded sorbents exhibited balanced adsorption dynamics. A PEI-loaded BS sorbent achieved a high initial CO2 adsorption capacity of 122.6 mg CO2 g–1, maintaining excellent stability with a capacity of 120.2 mg CO2 g–1 after ten cycles. Furthermore, the PEI-loaded BS sorbent exhibited only minor degradation when exposed to oxygen under ambient conditions, underscoring its potential for practical, sustainable CO2 capture applications.

Source: ACS Omega

DOI: 10.1021/acsomega.5c00061

Authors: Thanapha Numpilai, Metta Chareonpanich, Thongthai Witoon

Institutions: Thammasat University, Kasetsart University

Language: English

Topic: Carbon Dioxide Capture Technologies

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Climate action

Open Access status: gold

Estimated APC paid: $1,935