Synthesis of amine-modified solid Fe-Zr adsorbents for CO₂ adsorption

BACKGROUND: With the aggravation of the greenhouse effect, much attention is given to the capture of CO₂ before its emission into the atmosphere. So far, various solid adsorbents have been developed and used. Among them, solid materials modified with organic-amines are promising on account of good adsorption and desorption performance. In the present work, triethylenetetramine (TETA) modified solid Fe-Zr adsorbents were synthesized and characterized. The performance of the adsorbents for CO₂ adsorption was tested in a stream of 5% CO₂. RESULTS: The Fe-Zr support was first synthesized, and TETA was successfully grafted onto its surface. The adsorbents show good thermal stability and CO₂ adsorption ability. Increase in the amount of TETA and increased gas flow rate have a positive influence whereas increase of the adsorption temperature has a negative effect on CO₂ adsorption capacity. At 200 mg TETA loading and a flow rate of 20 cm³ g⁻¹, the adsorbent achieves a maximum adsorption capacity of 4.1 mmol g⁻¹ at 75 °C. In addition, the adsorbent exhibits excellent reusability and cyclic performance. CONCLUSION: Remarkable adsorption capacity and good recyclability suggest that synthesized TETA-functionalized Fe-Zr adsorbents have high potential for CO₂ capture in industry.