Chemical Engineering Research and Design

CO2 adsorption; Resin; TEPA; Kinetics analysis; Mechanism

Adsorbents prepared by impregnating tetraethylenepentamine (TEPA) into porous materials represent promising candidates for CO2 capture from coal-fired flue gas. This study impregnated TEPA into four types of resins to investigate the influence of different resins on the CO2 adsorption performance of TEPA-resin adsorbents. Experimental data indicate that the CO2 adsorption performance of TEPA-resin composites follows the order: DA201D > XAD-2 > ADS-17 > AB-8, where TEPA@DA201D exhibited the highest adsorption capacity of 3.46 mmol/g under 35℃ and 15 vol% CO2 conditions. TEPA@DA201D possesses a hierarchical mesoporous structure with a high pore volume (1.084 cm3/g) and large average pore diameter (20.0 nm), which synergistically enhances CO2 adsorption by promoting CO2 diffusion and improving the dispersion of active sites. Simultaneously, SEM images reveal that DA201D exhibits the least aggregation of surface amine groups compared to other adsorbents. Different adsorption kinetic models reveal that its adsorption behavior conforms to the Avrami model, primarily governed by the synergistic effects of physical and chemical adsorption. The rate-limiting steps for CO2 adsorption by the TEPA@DA201D adsorbent are mainly membrane diffusion and intra-particle diffusion at different temperatures. Furthermore, multifactorial interaction analysis indicates that adsorption temperature, gas flow rate, and CO2 concentration independently regulate the adsorption capacity of TEPA@DA201D. This work provides theoretical guidance and design strategies for improving the design and performance of organic amine-modified resin-based adsorbents.

Pengchao Zang

Jiyun Tang,Yong Dong

Daokuan Liang,Xiaozhe Wang,Lin Cui,Pei Zhao,Ning Qin,Zeyad Ammar Almutairi

期刊论文

225

188-198

3.9

10.1016/j.cherd.2025.12.016

否

2025-12

SCI