Enhanced CO2 adsorption of PEHA/sepiolite adsorbent by zirconium accelerator in post-combustion

The most promising approach to tackling the greenhouse gases is CO 2 capture and storage (CCS), and amine solid adsorbents are the most widely investigated materials. In this work, Zr species as an accelerator promote CO 2 adsorption of the Pentatethylenehexamine (PEHA)/sepiolite (SEP) adsorbents. The adsorption rate, CO 2 adsorption capacity, and amine efficiency were significantly improved under various conditions (temperature, gas flow, and CO 2 concentration) by the introduction of the optimal content of Zr, the optimal HSEP-Zr 0.13 -PEHA 0.5 -600 adsorbent exhibited 1.80 mmol/g at 60 °C. Adsorption experiments combine with characterization (TG, XPS, NH 3 -TPD, SEM and TEM) exhibited that the introduction of Zr species were high dispersion on sepiolite, and Zr-O bond was formed in the structure of sepiolite. The acidity of the sepiolite supporter was enhanced by Zr which is benefit for amine loading. Above all resulted in the regeneration and thermal stability of the adsorbent were improved together. The economic evaluation results demonstrated that the adsorbent with Zr species is low-cost for large-scale post-combustion CO 2 capture.