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Effective enhancement of CO2 capture performance by diethylenetriamine-modified mesoporous silica solid amine adsorbents: optimisation experiments and kinetic calculations

Huipeng Zhao, Jingsi Yang, Heli Tian, Kunjie Li , Ruihong Zhao, Xiaoqing Liu, Pingxia Zhang, Xiaoxue Niu, Guicai Wu, Haoming Li

Abstract

In this study, four DETA-SiO2 solid amine adsorbents were prepared by impregnation method using diethylenetriamine (DETA) as the amine source and four types of silica with different pore structures as the carrier, and the effects of varying amine concentrations, temperatures, and pressures on the CO2 adsorption performance were investigated. The results showed that the prepared N-MCM-48-C material reached a maximum CO2 adsorption of 417.45 mg/g at 25°C and 0.5 MPa. The effect of pressure on the adsorption performance was verified by kinetic calculations using the intraparticle diffusion model and the Thomas dynamic adsorption model. The presence of a surfactant (CTAB) dilutes the amine concentration and improves the homogenization of the amine on the carrier, increasing the CO2 mass transfer efficiency and adsorption capacity. Multiple pressure swing adsorption (PSA) experiments have shown that N-MCM-48-C material has stable adsorption performance during the PSA process, and the adsorption capacity can reach 300 mg/g.

CH25056  Accepted 15 August 2025

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