Facile improvement of amine dispersion in KIT-1 with the alkyl chains template for enhanced CO₂ adsorption capacity

Amine adsorbents have been considered as a promising sorbent for CO₂ capture, but amine agglomeration is a key challenge for the practical application. A series of adsorbents were successfully synthesized to enhance CO₂ adsorption capacity by impregnating tetraethylenepentamine (TEPA) into KIT-1 with the long-alkyl chains template remaining (KIT-1-W). The results of thermogravimetric analysis (TGA), X-ray powder diffraction (XRD), N₂ adsorption-desorption and Fourier transform infrared spectroscopy (FTIR) analysis studied the template and TEPA from qualifying and quantifying. KIT-1-W loaded with 50% TEPA (KIT-1-W-50) exhibited the maximum CO₂ adsorption capacity of 4.19 ​mmol ​g^-1 higher than the corresponding calcined KIT-1. Meanwhile, the role played by the template enhanced the dispersion of amine and provided more active sites according to the fitting results. Besides, the weaker strength of CO₂-amine interaction for KIT-1-W-50 depressed the adsorption heat and boosted CO₂ desorption. We presented an efficient way to explore the efficient adsorbents for CO₂ capture.