CO₂ adsorption performance over Fe-Zr functionalized with both polyether P123 and tetraethylenepentamine

Abstract

A mesoporous material of Fe-Zr(P) was synthesized by modifying the bimetallic material of Fe-Zr with polyether P123. Then, TEPA(n)/Fe-Zr(P) was prepared by modifying Fe-Zr(P) with tetraethylenepentamine (TEPA). X-ray diffraction, infrared spectroscopy, X-ray photoelectron spectroscopy, N2 adsorption-desorption and thermogravimetric analysis were used to analyze the structure and thermal stability of the synthesized materials. The results show that P123 is remained in the pore channels of the support. Besides, TEPA was introduced to the surface of Fe-Zr(P) through the coordination between N and Zr species. The adsorbents filled with P123 and TEPA keep stable when the temperature is less than 182℃. In addition, the adsorbents exhibit good CO2 adsorption performance in a stream of 5% CO2 concentration. Over TEPA(n)/Fe-Zr(P), both of the hydroxyl and amine groups react with CO2, leading to the occurrence of CO2 chemical adsorption and the enhancement of adsorption capacity and N utilization. When the mass fraction of TEPA is 30%, a remarkable adsorption capacity of 211.3 mg/g and the utilization of N species of 62.7% are achieved at 75℃ in a stream of 10 mL/min. After 20 cycles of adsorption-desorption, the adsorption capacity keeps stable.

Keywords

• fe-zr
• p123
• tetraethylenepentamine
• co₂
• adsorption